CWE-1284
AllowedImproper Validation of Specified Quantity in Input
Abstraction: Base · Status: Incomplete
The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties.
559 vulnerabilities reference this CWE, most recent first.
GHSA-28JG-WMV9-MFGW
Vulnerability from github – Published: 2023-05-16 00:30 – Updated: 2024-04-04 04:10In apu, there is a possible out of bounds read due to a missing bounds check. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS07767870; Issue ID: ALPS07767870.
{
"affected": [],
"aliases": [
"CVE-2023-20705"
],
"database_specific": {
"cwe_ids": [
"CWE-1284",
"CWE-20"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-05-15T22:15:10Z",
"severity": "MODERATE"
},
"details": "In apu, there is a possible out of bounds read due to a missing bounds check. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS07767870; Issue ID: ALPS07767870.",
"id": "GHSA-28jg-wmv9-mfgw",
"modified": "2024-04-04T04:10:25Z",
"published": "2023-05-16T00:30:16Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-20705"
},
{
"type": "WEB",
"url": "https://corp.mediatek.com/product-security-bulletin/May-2023"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-2C7V-9W46-2RMW
Vulnerability from github – Published: 2026-05-04 18:30 – Updated: 2026-06-30 03:36An issue in Assimp v.6.0.2 allows a remote attacker to cause a denial of service via the FBXParser.cpp, ParseVectorDataArray()
{
"affected": [],
"aliases": [
"CVE-2025-70071"
],
"database_specific": {
"cwe_ids": [
"CWE-1284",
"CWE-400"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-04T16:16:01Z",
"severity": "MODERATE"
},
"details": "An issue in Assimp v.6.0.2 allows a remote attacker to cause a denial of service via the FBXParser.cpp, ParseVectorDataArray()",
"id": "GHSA-2c7v-9w46-2rmw",
"modified": "2026-06-30T03:36:29Z",
"published": "2026-05-04T18:30:29Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-70071"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2025-70071"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2465675"
},
{
"type": "WEB",
"url": "https://gist.github.com/GunP4ng/6d80919905037929ce9266ccd207b9ea"
},
{
"type": "WEB",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-70071.json"
},
{
"type": "WEB",
"url": "http://assimp.com"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-2CX4-58J3-2JR5
Vulnerability from github – Published: 2026-01-16 21:30 – Updated: 2026-01-16 21:30DupTerminator 1.4.5639.37199 contains a denial of service vulnerability that allows attackers to crash the application by inputting a long character string in the Excluded text box. Attackers can generate a payload of 8000 repeated characters to trigger the application to stop working on Windows 10.
{
"affected": [],
"aliases": [
"CVE-2021-47818"
],
"database_specific": {
"cwe_ids": [
"CWE-1284"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-01-16T19:16:06Z",
"severity": "MODERATE"
},
"details": "DupTerminator 1.4.5639.37199 contains a denial of service vulnerability that allows attackers to crash the application by inputting a long character string in the Excluded text box. Attackers can generate a payload of 8000 repeated characters to trigger the application to stop working on Windows 10.",
"id": "GHSA-2cx4-58j3-2jr5",
"modified": "2026-01-16T21:30:36Z",
"published": "2026-01-16T21:30:36Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47818"
},
{
"type": "WEB",
"url": "https://sourceforge.net/projects/dupterminator"
},
{
"type": "WEB",
"url": "https://www.exploit-db.com/exploits/49917"
},
{
"type": "WEB",
"url": "https://www.vulncheck.com/advisories/dupterminator-denial-of-service"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"type": "CVSS_V4"
}
]
}
GHSA-2FHG-MFW9-PX88
Vulnerability from github – Published: 2026-03-21 15:33 – Updated: 2026-03-21 15:33Sandboxie 5.30 contains a denial of service vulnerability that allows local attackers to crash the application by supplying an excessively long string in the Program Alerts configuration field. Attackers can paste a buffer of 5000 characters into the 'Select or enter a program' field during program alert configuration to trigger an application crash.
{
"affected": [],
"aliases": [
"CVE-2019-25551"
],
"database_specific": {
"cwe_ids": [
"CWE-1282",
"CWE-1284"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-03-21T13:16:17Z",
"severity": "MODERATE"
},
"details": "Sandboxie 5.30 contains a denial of service vulnerability that allows local attackers to crash the application by supplying an excessively long string in the Program Alerts configuration field. Attackers can paste a buffer of 5000 characters into the \u0027Select or enter a program\u0027 field during program alert configuration to trigger an application crash.",
"id": "GHSA-2fhg-mfw9-px88",
"modified": "2026-03-21T15:33:23Z",
"published": "2026-03-21T15:33:23Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-25551"
},
{
"type": "WEB",
"url": "https://www.exploit-db.com/exploits/46860"
},
{
"type": "WEB",
"url": "https://www.sandboxie.com"
},
{
"type": "WEB",
"url": "https://www.vulncheck.com/advisories/sandboxie-denial-of-service-via-program-alerts-buffer-overflow"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"type": "CVSS_V4"
}
]
}
GHSA-2G6F-P97F-GP43
Vulnerability from github – Published: 2026-05-04 21:30 – Updated: 2026-05-04 21:30Conditional Fields for Contact Form 7 WordPress plugin through version 2.6.7 contains an uncontrolled resource consumption vulnerability in the Wpcf7cfMailParser class where the hide_hidden_mail_fields_regex_callback() method reads an iteration count directly from user-supplied POST parameters without validation or upper bound enforcement. Unauthenticated attackers can supply an arbitrarily large integer value through the REST API endpoint to cause unbounded loop execution with multiple preg_replace() operations, exhausting server memory and crashing the PHP process.
{
"affected": [],
"aliases": [
"CVE-2026-25863"
],
"database_specific": {
"cwe_ids": [
"CWE-1284"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-04T19:16:02Z",
"severity": "HIGH"
},
"details": "Conditional Fields for Contact Form 7 WordPress plugin through version 2.6.7 contains an uncontrolled resource consumption vulnerability in the Wpcf7cfMailParser class where the hide_hidden_mail_fields_regex_callback() method reads an iteration count directly from user-supplied POST parameters without validation or upper bound enforcement. Unauthenticated attackers can supply an arbitrarily large integer value through the REST API endpoint to cause unbounded loop execution with multiple preg_replace() operations, exhausting server memory and crashing the PHP process.",
"id": "GHSA-2g6f-p97f-gp43",
"modified": "2026-05-04T21:30:24Z",
"published": "2026-05-04T21:30:24Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25863"
},
{
"type": "WEB",
"url": "https://wordpress.org/plugins/cf7-conditional-fields/#developers"
},
{
"type": "WEB",
"url": "https://www.vulncheck.com/advisories/conditional-fields-for-contact-form-7-dos-via-uncontrolled-resource-consumption"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"type": "CVSS_V4"
}
]
}
GHSA-2H6C-J3GF-XP9R
Vulnerability from github – Published: 2023-02-10 19:52 – Updated: 2023-02-10 19:52Impact
When feeding untrusted user input into the size parameter of NewBitfield and FromBytes functions, an attacker can trigger panics.
This happen when the size is a not a multiple of 8 or is negative.
There were already a note in the NewBitfield documentation:
``` Panics if size is not a multiple of 8. ````
But it incomplete and missing from FromBytes's documentation.
This has been replaced by returning an (Bitfield, error) and returning a non nil error if the size is wrong.
Patches
- https://github.com/ipfs/go-bitfield/commit/5e1d256fe043fc4163343ccca83862c69c52e579
Workarounds
- Ensure
size%8 == 0 && size >= 0yourself before callingNewBitfieldorFromBytes
References
- https://github.com/ipfs/go-unixfs/security/advisories/GHSA-q264-w97q-q778
{
"affected": [
{
"package": {
"ecosystem": "Go",
"name": "github.com/ipfs/go-bitfield"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.1.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2023-23626"
],
"database_specific": {
"cwe_ids": [
"CWE-1284",
"CWE-754"
],
"github_reviewed": true,
"github_reviewed_at": "2023-02-10T19:52:45Z",
"nvd_published_at": "2023-02-09T21:15:00Z",
"severity": "MODERATE"
},
"details": "### Impact\nWhen feeding untrusted user input into the size parameter of `NewBitfield` and `FromBytes` functions, an attacker can trigger `panic`s.\n\nThis happen when the `size` is a not a multiple of `8` or is negative.\nThere were already a note in the `NewBitfield` documentation:\n\u003e ```\n\u003e Panics if size is not a multiple of 8.\n\u003e ````\n\nBut it incomplete and missing from `FromBytes`\u0027s documentation.\n\nThis has been replaced by returning an `(Bitfield, error)` and returning a non nil error if the size is wrong.\n\n### Patches\n- https://github.com/ipfs/go-bitfield/commit/5e1d256fe043fc4163343ccca83862c69c52e579\n\n### Workarounds\n- Ensure `size%8 == 0 \u0026\u0026 size \u003e= 0` yourself before calling `NewBitfield` or `FromBytes`\n\n### References\n- https://github.com/ipfs/go-unixfs/security/advisories/GHSA-q264-w97q-q778\n",
"id": "GHSA-2h6c-j3gf-xp9r",
"modified": "2023-02-10T19:52:45Z",
"published": "2023-02-10T19:52:45Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/ipfs/go-bitfield/security/advisories/GHSA-2h6c-j3gf-xp9r"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-23626"
},
{
"type": "WEB",
"url": "https://github.com/ipfs/go-bitfield/commit/5e1d256fe043fc4163343ccca83862c69c52e579"
},
{
"type": "PACKAGE",
"url": "https://github.com/ipfs/go-bitfield"
},
{
"type": "WEB",
"url": "https://pkg.go.dev/vuln/GO-2023-1558"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "IPFS go-bitfield vulnerable to DoS via malformed size arguments"
}
GHSA-2HM2-HC3V-44H9
Vulnerability from github – Published: 2026-07-20 21:35 – Updated: 2026-07-20 21:35Summary
Type: Predictable identifier generation. The toc plugin and TableOfContents directive both default to generating heading IDs of the form toc_1, toc_2, toc_3, ... with no input-derived component. An attacker who can place a heading anywhere in the document can predict which toc_N ID it will receive, and can inject HTML elsewhere (in a non-heading context) that uses the same id="toc_N" to either (a) shadow the legitimate heading anchor, breaking same-page navigation, or (b) collide with CSS or JavaScript that targets #toc_N selectors, redirecting click handlers and styling to attacker-chosen content.
File: src/mistune/toc.py line 36-37 (heading_id = lambda token, index: "toc_" + str(index + 1)); src/mistune/directives/toc.py line 33 (same default).
Root cause: the default heading_id callback ignores the heading's text content and uses only the headings's order in the document. Two documents rendered together (or one document with attacker-influenced headings spliced into trusted content) produce overlapping toc_N IDs. Because id attribute uniqueness is required by HTML, browsers behaviour on duplicate IDs is undefined; document.getElementById('toc_1') returns the first match, getElementsByTagName + querySelector semantics differ across paths, and CSS rules targeting #toc_1 apply to whichever element matches first in tree order.
Affected Code
File: src/mistune/toc.py, lines 33-39.
def add_toc_hook(md, min_level=1, max_level=3, heading_id=None):
if heading_id is None:
def heading_id(token, index):
return "toc_" + str(index + 1) # <-- BUG: index-only ID, no slug derived from heading text
File: src/mistune/directives/toc.py, lines 32-33.
class TableOfContents(DirectivePlugin):
def __init__(self, min_level=1, max_level=3):
# ...
def generate_heading_id(self, token, index):
return "toc_" + str(index + 1) # <-- BUG: same predictable scheme
Why it's wrong: the standard markdown-engine convention (used by GitHub-flavoured Markdown, Sphinx, MkDocs, pandoc, every modern markdown renderer in production) is to slugify the heading TEXT for the ID — <h1 id="introduction">Introduction</h1> — with a numeric suffix appended only when slug collisions occur. mistune's default punts the slugification entirely and produces purely positional IDs that an attacker can predict in O(1).
The downstream impacts:
- Same-page links with [click](#toc_1) go to whichever element with id="toc_1" appears first in tree order. If the attacker can land any HTML element with id="toc_1" before the real heading (via inline_html with escape=False, via the include-directive HTML branch, via attacker-supplied content earlier in the document), navigation is hijacked.
- CSS rules targeting #toc_1 apply to the wrong element.
- JavaScript bound to document.getElementById('toc_1') operates on the wrong element.
- The TOC's own <a href="#toc_1"> link in the rendered TOC list points to whichever element wins the duplicate-ID race.
Exploit Chain
- Application uses mistune with
add_toc_hook(md)orTableOfContentsdirective enabled (the documented setup for sites with TOC support). - Application renders an attacker-supplied document, or splices attacker content into a trusted document. With
escape=False(or via the include-directive.htmlbranch covered by my prior advisory), the attacker can place<a id="toc_1">...</a>anywhere in the document. - mistune assigns
id="toc_1"to the first heading. Now there are two elements withid="toc_1"in the page. - The rendered TOC contains
<a href="#toc_1">First heading</a>. Clicking it navigates to whichever element withid="toc_1"appears first in tree order. If the attacker placed their<a id="toc_1">BEFORE the heading, navigation is hijacked. - Same-page CSS / JS / aria-described references to
#toc_1similarly redirect.
Security Impact
Severity: sec-low. Not a direct XSS or RCE; the issue is identifier confusion that enables UI-redirection / navigation-hijack attacks. The realistic attacker capability is "make an internal anchor link go to attacker content instead of the real heading", or "make a CSS selector apply to attacker content", or "break aria/screen-reader associations".
Attacker capability: with the ability to plant any HTML element with id="toc_N" in the document, hijack <a href="#toc_N"> navigation and any CSS/JS targeting that ID. With escape=False, this is straightforward. With escape=True, the attacker needs another vector to land a raw id attribute (one of the include-directive branches, a sibling tooling pipeline that lets HTML through, etc.).
Preconditions: application uses TOC + the default heading_id callback. If the application provides its own heading_id (e.g., one based on slugified heading text, with collision suffixes), this finding does not apply.
Differential: PoC-verified against mistune@3.2.1:
import mistune
from mistune.directives import RSTDirective, TableOfContents
md = mistune.create_markdown(plugins=[RSTDirective([TableOfContents()])])
print(md('''
.. toc::
# Heading 1
# Heading 2
'''))
# Output (note: id="toc_1" / id="toc_2", purely positional):
# <details class="toc" open>
# <summary>Table of Contents</summary>
# <ul>
# <li><a href="#toc_1">Heading 1</a></li>
# <li><a href="#toc_2">Heading 2</a></li>
# </ul>
# </details>
# <h1 id="toc_1">Heading 1</h1>
# <h1 id="toc_2">Heading 2</h1>
The patched build (with the suggested fix below) produces text-derived slugs like id="heading-1" and id="heading-2", which are tied to content rather than position.
Suggested Fix
Default to slugifying the heading text:
--- a/src/mistune/toc.py
+++ b/src/mistune/toc.py
@@ -33,9 +33,18 @@ def add_toc_hook(md, min_level=1, max_level=3, heading_id=None):
if heading_id is None:
+ import re
+ _slug_re = re.compile(r"[^a-z0-9]+")
+ seen = {}
def heading_id(token, index):
- return "toc_" + str(index + 1)
+ text = striptags(md.renderer(md.inline(token["text"], {}), BlockState()))
+ slug = _slug_re.sub("-", text.lower()).strip("-") or "section"
+ n = seen.get(slug, 0)
+ seen[slug] = n + 1
+ return slug if n == 0 else f"{slug}-{n}"
Same change applies to src/mistune/directives/toc.py:33. Existing applications that have hardcoded #toc_N anchors will break; document the migration in the changelog and consider providing an opt-out flag for the legacy behaviour. Add a regression test that asserts heading IDs are slug-derived, not position-derived, and that collisions get a -N suffix.
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "mistune"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.3.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-59930"
],
"database_specific": {
"cwe_ids": [
"CWE-1284",
"CWE-345"
],
"github_reviewed": true,
"github_reviewed_at": "2026-07-20T21:35:11Z",
"nvd_published_at": "2026-07-08T17:17:28Z",
"severity": "MODERATE"
},
"details": "## Summary\n\n**Type:** Predictable identifier generation. The `toc` plugin and `TableOfContents` directive both default to generating heading IDs of the form `toc_1`, `toc_2`, `toc_3`, ... with no input-derived component. An attacker who can place a heading anywhere in the document can predict which `toc_N` ID it will receive, and can inject HTML elsewhere (in a non-heading context) that uses the same `id=\"toc_N\"` to either (a) shadow the legitimate heading anchor, breaking same-page navigation, or (b) collide with CSS or JavaScript that targets `#toc_N` selectors, redirecting click handlers and styling to attacker-chosen content.\n**File:** `src/mistune/toc.py` line 36-37 (`heading_id = lambda token, index: \"toc_\" + str(index + 1)`); `src/mistune/directives/toc.py` line 33 (same default).\n**Root cause:** the default `heading_id` callback ignores the heading\u0027s text content and uses only the headings\u0027s order in the document. Two documents rendered together (or one document with attacker-influenced headings spliced into trusted content) produce overlapping `toc_N` IDs. Because `id` attribute uniqueness is required by HTML, browsers behaviour on duplicate IDs is undefined; `document.getElementById(\u0027toc_1\u0027)` returns the first match, `getElementsByTagName + querySelector` semantics differ across paths, and CSS rules targeting `#toc_1` apply to whichever element matches first in tree order.\n\n## Affected Code\n\n**File:** `src/mistune/toc.py`, lines 33-39.\n\n```python\ndef add_toc_hook(md, min_level=1, max_level=3, heading_id=None):\n if heading_id is None:\n def heading_id(token, index):\n return \"toc_\" + str(index + 1) # \u003c-- BUG: index-only ID, no slug derived from heading text\n```\n\n**File:** `src/mistune/directives/toc.py`, lines 32-33.\n\n```python\nclass TableOfContents(DirectivePlugin):\n def __init__(self, min_level=1, max_level=3):\n # ...\n\n def generate_heading_id(self, token, index):\n return \"toc_\" + str(index + 1) # \u003c-- BUG: same predictable scheme\n```\n\n**Why it\u0027s wrong:** the standard markdown-engine convention (used by GitHub-flavoured Markdown, Sphinx, MkDocs, pandoc, every modern markdown renderer in production) is to slugify the heading TEXT for the ID \u2014 `\u003ch1 id=\"introduction\"\u003eIntroduction\u003c/h1\u003e` \u2014 with a numeric suffix appended only when slug collisions occur. mistune\u0027s default punts the slugification entirely and produces purely positional IDs that an attacker can predict in O(1).\n\nThe downstream impacts:\n- Same-page links with `[click](#toc_1)` go to whichever element with `id=\"toc_1\"` appears first in tree order. If the attacker can land any HTML element with `id=\"toc_1\"` before the real heading (via inline_html with `escape=False`, via the include-directive HTML branch, via attacker-supplied content earlier in the document), navigation is hijacked.\n- CSS rules targeting `#toc_1` apply to the wrong element.\n- JavaScript bound to `document.getElementById(\u0027toc_1\u0027)` operates on the wrong element.\n- The TOC\u0027s own `\u003ca href=\"#toc_1\"\u003e` link in the rendered TOC list points to whichever element wins the duplicate-ID race.\n\n## Exploit Chain\n\n1. Application uses mistune with `add_toc_hook(md)` or `TableOfContents` directive enabled (the documented setup for sites with TOC support).\n2. Application renders an attacker-supplied document, or splices attacker content into a trusted document. With `escape=False` (or via the include-directive `.html` branch covered by my prior advisory), the attacker can place `\u003ca id=\"toc_1\"\u003e...\u003c/a\u003e` anywhere in the document.\n3. mistune assigns `id=\"toc_1\"` to the first heading. Now there are two elements with `id=\"toc_1\"` in the page.\n4. The rendered TOC contains `\u003ca href=\"#toc_1\"\u003eFirst heading\u003c/a\u003e`. Clicking it navigates to whichever element with `id=\"toc_1\"` appears first in tree order. If the attacker placed their `\u003ca id=\"toc_1\"\u003e` BEFORE the heading, navigation is hijacked.\n5. Same-page CSS / JS / aria-described references to `#toc_1` similarly redirect.\n\n## Security Impact\n\n**Severity:** sec-low. Not a direct XSS or RCE; the issue is identifier confusion that enables UI-redirection / navigation-hijack attacks. The realistic attacker capability is \"make an internal anchor link go to attacker content instead of the real heading\", or \"make a CSS selector apply to attacker content\", or \"break aria/screen-reader associations\".\n**Attacker capability:** with the ability to plant any HTML element with `id=\"toc_N\"` in the document, hijack `\u003ca href=\"#toc_N\"\u003e` navigation and any CSS/JS targeting that ID. With `escape=False`, this is straightforward. With `escape=True`, the attacker needs another vector to land a raw `id` attribute (one of the include-directive branches, a sibling tooling pipeline that lets HTML through, etc.).\n**Preconditions:** application uses TOC + the default `heading_id` callback. If the application provides its own `heading_id` (e.g., one based on slugified heading text, with collision suffixes), this finding does not apply.\n**Differential:** PoC-verified against mistune@3.2.1:\n\n```python\nimport mistune\nfrom mistune.directives import RSTDirective, TableOfContents\nmd = mistune.create_markdown(plugins=[RSTDirective([TableOfContents()])])\n\nprint(md(\u0027\u0027\u0027\n.. toc::\n\n# Heading 1\n\n# Heading 2\n\u0027\u0027\u0027))\n\n# Output (note: id=\"toc_1\" / id=\"toc_2\", purely positional):\n# \u003cdetails class=\"toc\" open\u003e\n# \u003csummary\u003eTable of Contents\u003c/summary\u003e\n# \u003cul\u003e\n# \u003cli\u003e\u003ca href=\"#toc_1\"\u003eHeading 1\u003c/a\u003e\u003c/li\u003e\n# \u003cli\u003e\u003ca href=\"#toc_2\"\u003eHeading 2\u003c/a\u003e\u003c/li\u003e\n# \u003c/ul\u003e\n# \u003c/details\u003e\n# \u003ch1 id=\"toc_1\"\u003eHeading 1\u003c/h1\u003e\n# \u003ch1 id=\"toc_2\"\u003eHeading 2\u003c/h1\u003e\n```\n\nThe patched build (with the suggested fix below) produces text-derived slugs like `id=\"heading-1\"` and `id=\"heading-2\"`, which are tied to content rather than position.\n\n## Suggested Fix\n\nDefault to slugifying the heading text:\n\n```diff\n--- a/src/mistune/toc.py\n+++ b/src/mistune/toc.py\n@@ -33,9 +33,18 @@ def add_toc_hook(md, min_level=1, max_level=3, heading_id=None):\n if heading_id is None:\n+ import re\n+ _slug_re = re.compile(r\"[^a-z0-9]+\")\n+ seen = {}\n def heading_id(token, index):\n- return \"toc_\" + str(index + 1)\n+ text = striptags(md.renderer(md.inline(token[\"text\"], {}), BlockState()))\n+ slug = _slug_re.sub(\"-\", text.lower()).strip(\"-\") or \"section\"\n+ n = seen.get(slug, 0)\n+ seen[slug] = n + 1\n+ return slug if n == 0 else f\"{slug}-{n}\"\n```\n\nSame change applies to `src/mistune/directives/toc.py:33`. Existing applications that have hardcoded `#toc_N` anchors will break; document the migration in the changelog and consider providing an opt-out flag for the legacy behaviour. Add a regression test that asserts heading IDs are slug-derived, not position-derived, and that collisions get a `-N` suffix.",
"id": "GHSA-2hm2-hc3v-44h9",
"modified": "2026-07-20T21:35:12Z",
"published": "2026-07-20T21:35:11Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/lepture/mistune/security/advisories/GHSA-2hm2-hc3v-44h9"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59930"
},
{
"type": "WEB",
"url": "https://github.com/lepture/mistune/commit/c4093c4742ed0d10d9332fb8edb455869b7b581b"
},
{
"type": "PACKAGE",
"url": "https://github.com/lepture/mistune"
},
{
"type": "WEB",
"url": "https://github.com/lepture/mistune/releases/tag/v3.3.0"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/mistune/PYSEC-2026-2218.yaml"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
"type": "CVSS_V3"
}
],
"summary": "Mistune toc / TableOfContents directive: heading IDs use predictable `toc_N` numbering with no slugification, allowing collision with attacker-controlled `id=\"toc_N\"` content"
}
GHSA-2MJ3-6GRC-PX38
Vulnerability from github – Published: 2025-12-19 00:31 – Updated: 2025-12-19 21:04Improper Validation of Specified Index, Position, or Offset in Input (CWE-1285) in Filebeat Syslog parser and the Libbeat Dissect processor can allow a user to trigger a Buffer Overflow (CAPEC-100) and cause a denial of service (panic/crash) of the Filebeat process via either a malformed Syslog message or a malicious tokenizer pattern in the Dissect configuration.
{
"affected": [
{
"package": {
"ecosystem": "Go",
"name": "github.com/elastic/beats/v7"
},
"ranges": [
{
"events": [
{
"introduced": "7.7.0"
},
{
"fixed": "8.19.9"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Go",
"name": "github.com/elastic/beats/v7"
},
"ranges": [
{
"events": [
{
"introduced": "9.0.0"
},
{
"fixed": "9.1.9"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Go",
"name": "github.com/elastic/beats/v7"
},
"ranges": [
{
"events": [
{
"introduced": "9.2.0"
},
{
"fixed": "9.2.3"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Go",
"name": "github.com/elastic/beats/v7"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "7.0.0-alpha2.0.20251204214633-dd3af18220bf"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "Go",
"name": "github.com/elastic/beats"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"last_affected": "7.6.2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2025-68383"
],
"database_specific": {
"cwe_ids": [
"CWE-120",
"CWE-1284"
],
"github_reviewed": true,
"github_reviewed_at": "2025-12-19T21:04:09Z",
"nvd_published_at": "2025-12-18T22:16:02Z",
"severity": "MODERATE"
},
"details": "Improper Validation of Specified Index, Position, or Offset in Input (CWE-1285) in Filebeat Syslog parser and the Libbeat Dissect processor can allow a user to trigger a Buffer Overflow (CAPEC-100) and cause a denial of service (panic/crash) of the Filebeat process via either a malformed Syslog message or a malicious tokenizer pattern in the Dissect configuration.",
"id": "GHSA-2mj3-6grc-px38",
"modified": "2025-12-19T21:04:09Z",
"published": "2025-12-19T00:31:42Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68383"
},
{
"type": "WEB",
"url": "https://github.com/elastic/beats/commit/27a168fb1c598d4a16748e9a7382bc0d197335a5"
},
{
"type": "WEB",
"url": "https://github.com/elastic/beats/commit/2f971a057eea68e057b47829950cd8c26805df30"
},
{
"type": "WEB",
"url": "https://github.com/elastic/beats/commit/339fa3f887a14c91e0c955b50a3b8819393bd632"
},
{
"type": "WEB",
"url": "https://discuss.elastic.co/t/filebeat-8-19-9-9-1-9-and-9-2-3-security-update-esa-2025-32/384180"
},
{
"type": "PACKAGE",
"url": "https://github.com/elastic/elasticsearch"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "Filebeat Beats has Buffer Overflow via Malformed Syslog Message or Malicious Tokenizer Pattern in Dissect Configuration"
}
GHSA-2PRH-76MQ-H4GX
Vulnerability from github – Published: 2022-11-11 12:00 – Updated: 2022-11-16 12:00DexLoader function get_stringidx_fromdex() in Redex prior to commit 3b44c64 can load an out of bound address when loading the string index table, potentially allowing remote code execution during processing of a 3rd party Android APK file.
{
"affected": [],
"aliases": [
"CVE-2022-36938"
],
"database_specific": {
"cwe_ids": [
"CWE-119",
"CWE-125",
"CWE-1284"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2022-11-11T00:15:00Z",
"severity": "CRITICAL"
},
"details": "DexLoader function get_stringidx_fromdex() in Redex prior to commit 3b44c64 can load an out of bound address when loading the string index table, potentially allowing remote code execution during processing of a 3rd party Android APK file.",
"id": "GHSA-2prh-76mq-h4gx",
"modified": "2022-11-16T12:00:20Z",
"published": "2022-11-11T12:00:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-36938"
},
{
"type": "WEB",
"url": "https://github.com/facebook/redex/commit/3b44c640346b77bfb7ef36e2413688dd460288d2"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-2PW7-G86G-76Q7
Vulnerability from github – Published: 2026-05-27 00:31 – Updated: 2026-08-31 03:33A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.
{
"affected": [],
"aliases": [
"CVE-2026-42013"
],
"database_specific": {
"cwe_ids": [
"CWE-1284",
"CWE-295"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-05-26T22:16:42Z",
"severity": "HIGH"
},
"details": "A flaw was found in gnutls. When validating certificates, an oversized Subject Alternative Name (SAN) could cause the validation process to incorrectly fall back to checking the Common Name (CN) field. This could allow a remote attacker to bypass proper certificate validation, potentially leading to spoofing or man-in-the-middle attacks.",
"id": "GHSA-2pw7-g86g-76q7",
"modified": "2026-08-31T03:33:14Z",
"published": "2026-05-27T00:31:27Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42013"
},
{
"type": "WEB",
"url": "https://www.gnutls.org/security-new.html#GNUTLS-SA-2026-04-29-8"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467448"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2026-42013"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:58981"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:57483"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:56853"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:43575"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:41921"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:40762"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:33125"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:32962"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:30850"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:30849"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:30004"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:29197"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:26409"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:26319"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:20613"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:20612"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:20611"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:13274"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N",
"type": "CVSS_V3"
}
]
}
Mitigation MIT-5
Strategy: Input Validation
- Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
- When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
- Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
No CAPEC attack patterns related to this CWE.