Common Weakness Enumeration
CWE-407
Allowed-with-ReviewInefficient Algorithmic Complexity
Abstraction: Class · Status: Incomplete
An algorithm in a product has an inefficient worst-case computational complexity that may be detrimental to system performance and can be triggered by an attacker, typically using crafted manipulations that ensure that the worst case is being reached.
320 vulnerabilities reference this CWE, most recent first.
CVE-2026-86428 (GCVE-0-2026-86428)
Vulnerability from cvelistv5 – Published: 2026-09-07 12:53 – Updated: 2026-09-08 12:50
VLAI
EPSS
VEX
Title
commonmark 1.5.0 before 2.10.0 Denial of Service via Attributes
Summary
commonmark versions from 1.5.0 before 2.10.0 contain a denial of service vulnerability in the AttributesExtension when processing distinctly-named attributes. Attackers can submit Markdown with numerous distinct attribute names to cause quadratic-time attribute merging and filtering, consuming disproportionate CPU resources and preventing legitimate requests from completing.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 12:50 UTC
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/thephpleague/commonmark/securi… | vendor-advisory |
| https://www.vulncheck.com/advisories/commonmark-1… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| thephpleague | commonmark |
Affected:
1.5.0 , < 2.10.0
(semver)
Unaffected: 2.10.0 (semver) cpe:2.3:a:thephpleague:commonmark:*:*:*:*:*:*:*:* |
Date Public
2026-08-11 00:00
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CVE-2026-86349 (GCVE-0-2026-86349)
Vulnerability from cvelistv5 – Published: 2026-09-14 13:51 – Updated: 2026-09-14 19:23
VLAI
EPSS
VEX
Title
Mattermost Server Algorithmic DoS via Unbounded Markdown Block Nesting
Summary
Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.8, 10.11.x <= 10.11.22 fail to limit the nesting depth in the server-side Markdown parser which allows an authenticated attacker to cause a denial of service (CPU resource exhaustion) via a crafted post containing deeply nested blockquotes or list items.. Mattermost Advisory ID: MMSA-2026-00707
Severity
4.3 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 19:13 UTC
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.9.0 , ≤ 11.9.0
(semver)
Affected: 11.8.0 , ≤ 11.8.4 (semver) Affected: 11.7.0 , ≤ 11.7.8 (semver) Affected: 10.11.0 , ≤ 10.11.22 (semver) Unaffected: 11.10.0 Unaffected: 11.9.1 Unaffected: 11.8.5 Unaffected: 11.7.9 Unaffected: 10.11.23 |
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CVE-2026-85446 (GCVE-0-2026-85446)
Vulnerability from cvelistv5 – Published: 2026-09-03 22:38 – Updated: 2026-09-04 13:40
VLAI
EPSS
VEX
Title
MOOS-IvP through 24.8.1 uFldNodeComms Quadratic Processing Denial of Service
Summary
MOOS-IvP versions through 24.8.1 contain a quadratic processing vulnerability in uFldNodeComms where each new node identity creates a ledger entry and triggers all-pairs distribution work. Attackers can supply unbounded distinct node names in reports to drive the shoreside broker into quadratic processing, delaying or preventing distribution of legitimate node reports.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 13:28 UTC
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/moos-ivp/moos-ivp/pull/131 | issue-trackingpatch |
| https://github.com/moos-ivp/moos-ivp/commit/8e300… | patch |
| https://github.com/moos-ivp/moos-ivp | product |
| https://github.com/moos-ivp/moos-ivp/blob/1de9ae1… | technical-description |
| https://www.vulncheck.com/advisories/moos-ivp-thr… | third-party-advisory |
Impacted products
Date Public
2026-09-02 00:00
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CVE-2026-84378 (GCVE-0-2026-84378)
Vulnerability from cvelistv5 – Published: 2026-09-02 17:54 – Updated: 2026-09-02 19:00
VLAI
EPSS
VEX
Title
HTTPX2: Quadratic SSE line buffering can cause CPU denial of service
Summary
HTTPX2 is a next generation HTTP client for Python. From 2.5.0 until 2.10.0, the HTTPX2 Server-Sent Events parser in src/httpx2/httpx2/_sse.py repeatedly copies and rescans buffered text in _SSELineDecoder.decode() when an attacker-controlled or compromised SSE endpoint splits one unterminated line across many response chunks. The behavior affects httpx2.Client.sse() and httpx2.AsyncClient.sse(), and the total processing work grows quadratically with the line length, allowing a crafted stream to consume excessive CPU and block a synchronous worker or asynchronous event loop. This issue is fixed in version 2.10.0.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 19:00 UTC
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/pydantic/httpx2/security/advis… | x_refsource_CONFIRM |
| https://github.com/pydantic/httpx2/pull/1071 | x_refsource_MISC |
| https://github.com/pydantic/httpx2/pull/1117 | x_refsource_MISC |
| https://github.com/pydantic/httpx2/commit/cbfc0e0… | x_refsource_MISC |
| https://github.com/pydantic/httpx2/releases/tag/v2.10.0 | x_refsource_MISC |
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CVE-2026-84375 (GCVE-0-2026-84375)
Vulnerability from cvelistv5 – Published: 2026-09-01 21:43 – Updated: 2026-09-02 16:02
VLAI
EPSS
VEX
Title
js-yaml: maxTotalMergeKeys does not limit CPU use for empty merge sources
Summary
js-yaml is a JavaScript YAML parser and dumper. From 3.0.0 until 3.15.2 and 4.3.2, maxTotalMergeKeys in lib/js-yaml/loader.js and lib/loader.js does not count empty mapping sources while processing the merge key <<. An attacker can alias a large sequence of empty mappings into many merge targets, causing O(N * K) processing while totalMergeKeys remains unchanged and the configured resource limit is never reached. A relatively small YAML document can therefore cause prolonged CPU consumption in applications that parse untrusted YAML, and merge processing is enabled by default on these release lines. This issue is fixed in versions 3.15.2 and 4.3.2.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-02 13:43 UTC
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/nodeca/js-yaml/security/adviso… | x_refsource_CONFIRM |
| https://github.com/nodeca/js-yaml/pull/797 | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/commit/3485bc06… | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/commit/6a8e05f9… | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/commit/d90b6612… | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/releases/tag/3.15.2 | x_refsource_MISC |
| https://github.com/nodeca/js-yaml/releases/tag/4.3.2 | x_refsource_MISC |
Impacted products
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CVE-2026-84305 (GCVE-0-2026-84305)
Vulnerability from cvelistv5 – Published: 2026-09-01 18:33 – Updated: 2026-09-01 19:12
VLAI
EPSS
VEX
Title
sqlparse: Reindentation of tuple lists causes near-cap quadratic CPU consumption
Summary
sqlparse is a non-validating SQL parser module for Python. Prior to 0.6.0, sqlparse.format(sql, reindent=True) and sqlformat --reindent route attacker-controlled parenthesized tuple lists through ReindentFilter._get_offset() in sqlparse/filters/reindent.py, where _flatten_up_to_token() repeatedly rebuilds and joins the statement prefix. Thousands of offset calculations walk an expanding token tree, producing quadratic CPU consumption for inputs that remain below MAX_GROUPING_TOKENS and causing request delays, reduced throughput, or worker starvation. This issue is fixed in version 0.6.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-01 19:12 UTC
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/andialbrecht/sqlparse/security… | x_refsource_CONFIRM |
| https://github.com/andialbrecht/sqlparse/commit/a… | x_refsource_MISC |
| https://github.com/andialbrecht/sqlparse/releases… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| andialbrecht | sqlparse |
Affected:
< 0.6.0
|
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CVE-2026-83614 (GCVE-0-2026-83614)
Vulnerability from cvelistv5 – Published: 2026-09-01 14:41 – Updated: 2026-09-01 18:05
VLAI
EPSS
VEX
Title
xmldom: Quadratic-time parsing via the malformed-input recovery path — `parseElementStartPart` re-scan and `normalize()` adjacent-text merge
Summary
xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom versions 0.3.0 through 0.6.0, two independent quadratic paths can cause denial of service. In lib/sax.js, parseElementStartPart repeatedly rescans a malformed tag name to the next > during single-character recovery; in lib/dom.js, normalize() repeatedly removes and appends adjacent text nodes, causing quadratic reindexing and string rebuilding. The first path is reachable through default DOMParser.parseFromString() processing, while the second is also reachable through a direct normalize() call on a programmatically constructed DOM, and endDocument invokes that normalization after parsing. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-01 17:34 UTC
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/xmldom/xmldom/security/advisor… | x_refsource_CONFIRM |
| https://github.com/xmldom/xmldom/pull/1071 | x_refsource_MISC |
| https://github.com/xmldom/xmldom/pull/1072 | x_refsource_MISC |
| https://github.com/xmldom/xmldom/commit/0748720b6… | x_refsource_MISC |
| https://github.com/xmldom/xmldom/commit/f40ccb861… | x_refsource_MISC |
| https://github.com/xmldom/xmldom/releases/tag/0.8.15 | x_refsource_MISC |
| https://github.com/xmldom/xmldom/releases/tag/0.9.12 | x_refsource_MISC |
Impacted products
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CVE-2026-83613 (GCVE-0-2026-83613)
Vulnerability from cvelistv5 – Published: 2026-09-01 14:38 – Updated: 2026-09-04 01:57
VLAI
EPSS
VEX
Title
xmldom: Quadratic-time attribute deduplication
Summary
xmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) DOMParser and XMLSerializer module. Prior to @xmldom/xmldom versions 0.8.15 and 0.9.12, and in xmldom version 0.6.0 and earlier, DOMHandler.startElement in lib/dom-parser.js inserts every parsed attribute through setAttributeNode, while NamedNodeMap.setNamedItem in lib/dom.js calls the linear getNamedItem or getNamedItemNS lookup for each insertion. A well-formed element with many distinct attributes therefore requires quadratic comparisons during DOMParser.parseFromString() and can stall a Node.js event loop before application validation. This issue is fixed in @xmldom/xmldom versions 0.8.15 and 0.9.12; no fixed version is available for xmldom.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 01:57 UTC
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://github.com/xmldom/xmldom/security/advisor… | x_refsource_CONFIRM |
| https://github.com/xmldom/xmldom/pull/1071 | x_refsource_MISC |
| https://github.com/xmldom/xmldom/pull/1072 | x_refsource_MISC |
| https://github.com/xmldom/xmldom/commit/2c548f200… | x_refsource_MISC |
| https://github.com/xmldom/xmldom/commit/cfb09b5db… | x_refsource_MISC |
| https://github.com/xmldom/xmldom/releases/tag/0.8.15 | x_refsource_MISC |
| https://github.com/xmldom/xmldom/releases/tag/0.9.12 | x_refsource_MISC |
| https://github.com/xmldom/xmldom/security/advisor… | exploit |
Impacted products
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CVE-2026-82760 (GCVE-0-2026-82760)
Vulnerability from cvelistv5 – Published: 2026-09-17 13:08 – Updated: 2026-09-17 18:21
VLAI
EPSS
VEX
Title
Superlinear base62 decoding exhausts CPU and memory in AshAuthentication API key sign-in
Summary
Inefficient Algorithmic Complexity vulnerability in team-alembic AshAuthentication allows an unauthenticated attacker to exhaust CPU and memory via an oversized base62 segment in a submitted API key.
AshAuthentication.Base.decode62/1 in lib/ash_authentication/base.ex splits its argument into one binary per character and folds it with charval62/2, which recomputes Integer.pow(62, index) at every position instead of accumulating by Horner's method, so cost grows roughly cubically in the input length. bindecode62/1 in the same module is quadratic through Integer.undigits/2 and Integer.digits/2. Neither function caps byte_size/1, and AshAuthentication.Strategy.ApiKey.SignInPreparation passes the underscore-separated segments of the submitted key straight into both, before any key lookup and without prior authentication. The surrounding rescue clauses catch exceptions, not CPU or memory exhaustion.
This issue affects ash_authentication: from 4.8.0 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 18:21 UTC
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| team-alembic | ash_authentication |
Affected:
4.8.0 , < 4.15.0
(semver)
Affected: 5.0.0-rc.0 , < 5.0.0-rc.14 (semver) cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:* |
|
| team-alembic | ash_authentication |
Affected:
f3a53f480088419788d5c3934af3131fa9066773 , < *
(git)
cpe:2.3:a:team-alembic:ash_authentication:*:*:*:*:*:*:*:* |
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CVE-2026-82729 (GCVE-0-2026-82729)
Vulnerability from cvelistv5 – Published: 2026-09-04 14:31 – Updated: 2026-09-04 19:33
VLAI
EPSS
VEX
Title
Quadratic chunk-size parsing in Mint.HTTP1.Parse allows CPU-exhaustion DoS
Summary
Inefficient Algorithmic Complexity vulnerability in elixir-mint mint allows a remote HTTP server to exhaust CPU on the client host and cause a denial of service.
parse_hex_prefix/2 in lib/mint/http1/parse.ex folds each hex digit of a chunked response's chunk-size field into an arbitrary-precision accumulator with acc * 16 + digit and imposes no limit on the digit count. Because the accumulator grows without bound, the multiplication is not constant time and one pass over N digits costs O(N squared). handle_data/2 prepends conn.buffer and re-parses from the start on every socket message, so a server that dribbles the digits out in small packets makes the client pay that cost repeatedly. A run of roughly 512,000 hex digits costs over ten seconds of CPU in a single pass, measured on stock defaults. The parser reaches this state after a valid status line and a complete, valid header section, so an intermediary inspecting only headers sees an ordinary 200 response.
This issue affects mint: from 1.9.3 before 1.10.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 19:33 UTC
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/elixir-mint/mint/security/advi… | relatedvendor-advisory |
| https://cna.erlef.org/cves/CVE-2026-82729.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-82729 | related |
| https://github.com/elixir-mint/mint/commit/bd2a4e… | patch |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| elixir-mint | mint |
Affected:
1.9.3 , < 1.10.0
(semver)
cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:* |
|
| elixir-mint | mint |
Affected:
fc7d16538db7e40b56ed489f08683225cb0197fa , < bd2a4e7513594997c140cfef9fe0e968712fb588
(git)
cpe:2.3:a:elixir-mint:mint:*:*:*:*:*:*:*:* |
{
"containers": {
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"timestamp": "2026-09-04T19:33:08.928597Z",
"version": "2.0.3"
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"product": "mint",
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"credits": [
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"type": "finder",
"value": "Tr3bor"
},
{
"lang": "en",
"type": "reporter",
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},
{
"lang": "en",
"type": "remediation developer",
"value": "Andrea Leopardi"
},
{
"lang": "en",
"type": "coordinator",
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}
],
"descriptions": [
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"supportingMedia": [
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"base64": false,
"type": "text/html",
"value": "\u003cp\u003eInefficient Algorithmic Complexity vulnerability in elixir-mint mint allows a remote HTTP server to exhaust CPU on the client host and cause a denial of service.\u003c/p\u003e\n\u003cp\u003e\u003ccode\u003eparse_hex_prefix/2\u003c/code\u003e in \u003ccode\u003elib/mint/http1/parse.ex\u003c/code\u003e folds each hex digit of a chunked response\u0027s chunk-size field into an arbitrary-precision accumulator with \u003ccode\u003eacc * 16 + digit\u003c/code\u003e and imposes no limit on the digit count. Because the accumulator grows without bound, the multiplication is not constant time and one pass over \u003ccode\u003eN\u003c/code\u003e digits costs O(N squared). \u003ccode\u003ehandle_data/2\u003c/code\u003e prepends \u003ccode\u003econn.buffer\u003c/code\u003e and re-parses from the start on every socket message, so a server that dribbles the digits out in small packets makes the client pay that cost repeatedly. A run of roughly 512,000 hex digits costs over ten seconds of CPU in a single pass, measured on stock defaults. The parser reaches this state after a valid status line and a complete, valid header section, so an intermediary inspecting only headers sees an ordinary 200 response.\u003c/p\u003e\n\u003cp\u003eThis issue affects mint: from 1.9.3 before 1.10.0.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "Inefficient Algorithmic Complexity vulnerability in elixir-mint mint allows a remote HTTP server to exhaust CPU on the client host and cause a denial of service.\n\n`parse_hex_prefix/2` in `lib/mint/http1/parse.ex` folds each hex digit of a chunked response\u0027s chunk-size field into an arbitrary-precision accumulator with `acc * 16 + digit` and imposes no limit on the digit count. Because the accumulator grows without bound, the multiplication is not constant time and one pass over `N` digits costs O(N squared). `handle_data/2` prepends `conn.buffer` and re-parses from the start on every socket message, so a server that dribbles the digits out in small packets makes the client pay that cost repeatedly. A run of roughly 512,000 hex digits costs over ten seconds of CPU in a single pass, measured on stock defaults. The parser reaches this state after a valid status line and a complete, valid header section, so an intermediary inspecting only headers sees an ordinary 200 response.\n\nThis issue affects mint: from 1.9.3 before 1.10.0."
}
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}
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"impacts": [
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"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
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"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
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"format": "CVSS",
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"problemTypes": [
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"descriptions": [
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"description": "CWE-407 Inefficient Algorithmic Complexity",
"lang": "en",
"type": "CWE"
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"providerMetadata": {
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"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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{
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"url": "https://cna.erlef.org/cves/CVE-2026-82729.html"
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"url": "https://osv.dev/vulnerability/EEF-CVE-2026-82729"
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"url": "https://github.com/elixir-mint/mint/commit/bd2a4e7513594997c140cfef9fe0e968712fb588"
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],
"source": {
"discovery": "EXTERNAL"
},
"title": "Quadratic chunk-size parsing in Mint.HTTP1.Parse allows CPU-exhaustion DoS"
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-82729",
"datePublished": "2026-09-04T14:31:20.562Z",
"dateReserved": "2026-08-31T00:59:08.960Z",
"dateUpdated": "2026-09-04T19:33:32.398Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.