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.
260 vulnerabilities reference this CWE, most recent first.
CVE-2026-63447 (GCVE-0-2026-63447)
Vulnerability from cvelistv5 – Published: 2026-09-18 20:21 – Updated: 2026-09-21 18:21
VLAI
EPSS
VEX
Title
Suricata ftp: crafted FTP traffic can cause quadratic CPU consumption
Summary
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.5 until 8.0.6, the FTP parser in src/app-layer-ftp.c can continue allocating transactions after app-layer.protocols.ftp.max-tx is reached while processing one large chunk of FTP command data. The oversized transaction list is repeatedly processed with quadratic complexity after the too_many_transactions event, allowing crafted FTP traffic to degrade packet processing, reduce monitoring visibility, or cause denial of service. This issue is fixed in version 8.0.6.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-21 18:21 UTC
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
GitHub_M
CNA
References
5 references
| URL | Tags |
|---|---|
| https://github.com/OISF/suricata/security/advisor… | x_refsource_CONFIRM |
| https://github.com/OISF/suricata/commit/15bf91c5c… | x_refsource_MISC |
| https://github.com/OISF/suricata/commit/82c419055… | x_refsource_MISC |
| https://github.com/OISF/suricata/releases/tag/sur… | x_refsource_MISC |
| https://redmine.openinfosecfoundation.org/issues/8592 | x_refsource_MISC |
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CVE-2026-63446 (GCVE-0-2026-63446)
Vulnerability from cvelistv5 – Published: 2026-09-18 20:22 – Updated: 2026-09-21 16:20
VLAI
EPSS
VEX
Title
Suricata app-layer: passed flows can retain transactions, causing resource exhaustion
Summary
Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, AppLayerParserSetTransactionInspectId() in src/app-layer-parser.c uses an inverted guard and marks only already-inspected transactions as inspected. On flows passed by a pass rule or pass-the-flow exception policy, detection is skipped, so completed transactions remain unmarked, are never freed, and are repeatedly rescanned. The per-flow list can grow without bound with quadratic cleanup cost, causing CPU and memory exhaustion. This issue is fixed in version 8.0.6.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-21 16:18 UTC
CWE
Assigner
GitHub_M
CNA
References
6 references
| URL | Tags |
|---|---|
| https://github.com/OISF/suricata/security/advisor… | x_refsource_CONFIRM |
| https://github.com/OISF/suricata/pull/15726 | x_refsource_MISC |
| https://github.com/OISF/suricata/commit/006e21c1c… | x_refsource_MISC |
| https://github.com/OISF/suricata/commit/60a83c62a… | x_refsource_MISC |
| https://github.com/OISF/suricata/releases/tag/sur… | x_refsource_MISC |
| https://redmine.openinfosecfoundation.org/issues/8628 | x_refsource_MISC |
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CVE-2026-62160 (GCVE-0-2026-62160)
Vulnerability from cvelistv5 – Published: 2026-10-30 18:26 – Updated: 2026-10-30 19:39
VLAI
EPSS
VEX
Title
Daptin: ParseAcceptLanguage `_` separator bypass enables >250x CPU amplification via Accept-Language header in LanguageMiddleware
Summary
Daptin is a GraphQL/JSON-API headless CMS. Prior to 0.12.26, the global `LanguageMiddleware` in `server/language.go` passes the raw `Accept-Language` header from `LanguageMiddlewareFunc` through `GetLanguagePreference` to `golang.org/x/text/language.ParseAcceptLanguage` without a size or shape filter. The guard for CVE-2022-32149 counts hyphens but not underscores, even though the internal parser normalizes underscores to hyphens. Long lists of underscore-separated language subtags longer than eight characters bypass the guard. These subtags fail the `len <= 8` length check in `golang.org/x/text/internal/language/parse.go`, causing repeated `gobble` operations to move the entire remaining buffer through `runtime.memmove`. With many invalid subtags, this repeated buffer movement takes quadratic work. Unauthenticated requests to the public landing page or `/api` can consume disproportionate CPU, with a 256 KiB header already causing seconds of processing and larger input permitted by the default 1 MiB header ceiling. `resource.CheckErr` also logs the entire invalid header, amplifying cost, while normal successful HTTP responses can conceal the denial-of-service traffic. Repeated requests can saturate server CPU. This issue is fixed in version 0.12.26.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-30 19:38 UTC
Assigner
GitHub_M
CNA
References
2 references
| URL | Tags |
|---|---|
| https://github.com/daptin/daptin/security/advisor… | x_refsource_CONFIRM |
| https://github.com/daptin/daptin/commit/2d7095097… | x_refsource_MISC |
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CVE-2026-61814 (GCVE-0-2026-61814)
Vulnerability from cvelistv5 – Published: 2026-09-23 18:39 – Updated: 2026-09-23 19:41
VLAI
EPSS
VEX
Title
Jawn: Quadratic parsing effort in AsyncParser
Summary
Jawn is an open source JSON parser. Prior to 1.7.0, Jawn's AsyncParser can perform quadratic work when a single JSON token is delivered across many small chunks because each absorb call rescans the incomplete token from the start. A remote attacker who controls untrusted JSON input and its chunk sizes can exhaust CPU resources and cause denial of service in applications using AsyncParser. This issue is fixed in version 1.7.0.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 19:25 UTC
Assigner
GitHub_M
CNA
References
3 references
| URL | Tags |
|---|---|
| https://github.com/typelevel/jawn/security/adviso… | x_refsource_CONFIRM |
| https://github.com/typelevel/jawn/commit/cddcd5e3… | x_refsource_MISC |
| https://github.com/typelevel/jawn/releases/tag/v1.7.0 | x_refsource_MISC |
Impacted products
4 products
| Vendor | Product | Version | |
|---|---|---|---|
| typelevel | jawn |
Affected:
< 1.7.0
|
|
| org.typelevel | jawn-parser_2.12 |
Affected:
< 1.7.0
|
|
| org.typelevel | jawn-parser_2.13 |
Affected:
< 1.7.0
|
|
| org.typelevel | jawn-parser_3 |
Affected:
< 1.7.0
|
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CVE-2026-59928 (GCVE-0-2026-59928)
Vulnerability from cvelistv5 – Published: 2026-07-08 16:23 – Updated: 2026-07-08 19:40
VLAI
EPSS
VEX
Title
Mistune block_parser: quadratic-time parsing on long lists of repeated reference-link definitions
Summary
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a Markdown document containing many repeated or distinct reference-link definitions causes quadratic work in src/mistune/block_parser.py and the ref_links environment dictionary handling, allowing denial of service through CPU exhaustion. This issue is fixed in version 3.3.0.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-08 17:46 UTC
CWE
Assigner
GitHub_M
CNA
References
3 references
| URL | Tags |
|---|---|
| https://github.com/lepture/mistune/security/advis… | x_refsource_CONFIRM |
| https://github.com/lepture/mistune/commit/2b04d7b… | x_refsource_MISC |
| https://github.com/lepture/mistune/releases/tag/v3.3.0 | x_refsource_MISC |
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CVE-2026-59925 (GCVE-0-2026-59925)
Vulnerability from cvelistv5 – Published: 2026-07-08 16:18 – Updated: 2026-07-08 19:44
VLAI
EPSS
VEX
Title
inline_parser: quadratic-time parsing on long runs of `**x**` and `***x***` emphasis pairs
Summary
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, long sequences of well-formed double-asterisk or triple-asterisk emphasis pairs around a character cause quadratic work in src/mistune/inline_parser.py because the parser scans forward for matching close markers from every potential opening run, allowing denial of service in default Mistune parsing. This issue is fixed in version 3.3.0.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-08 19:44 UTC
CWE
Assigner
GitHub_M
CNA
References
3 references
| URL | Tags |
|---|---|
| https://github.com/lepture/mistune/security/advis… | x_refsource_CONFIRM |
| https://github.com/lepture/mistune/commit/5de41fb… | x_refsource_MISC |
| https://github.com/lepture/mistune/releases/tag/v3.3.0 | x_refsource_MISC |
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CVE-2026-59922 (GCVE-0-2026-59922)
Vulnerability from cvelistv5 – Published: 2026-07-08 16:12 – Updated: 2026-07-09 14:40
VLAI
EPSS
VEX
Title
Mistune plugins/formatting: quadratic-time parsing on long runs of `~~x~~`, `==x==`, and `^^x^^` markers (strikethrough / mark / insert)
Summary
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a run of closed tilde, equals-sign, or caret marker pairs around a character causes quadratic work in src/mistune/plugins/formatting.py when the strikethrough, mark, or insert plugin scans for matching markers from each possible start position, allowing denial of service through CPU exhaustion. This issue is fixed in version 3.3.0.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-09 14:39 UTC
CWE
Assigner
GitHub_M
CNA
References
3 references
| URL | Tags |
|---|---|
| https://github.com/lepture/mistune/security/advis… | x_refsource_CONFIRM |
| https://github.com/lepture/mistune/commit/96d0f57… | x_refsource_MISC |
| https://github.com/lepture/mistune/releases/tag/v3.3.0 | x_refsource_MISC |
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CVE-2026-59887 (GCVE-0-2026-59887)
Vulnerability from cvelistv5 – Published: 2026-07-08 15:58 – Updated: 2026-07-09 14:41
VLAI
EPSS
VEX
Title
linkify-it: Quadratic-complexity DoS via the `mailto:` validator scan-loop on attacker text
Summary
linkify-it is a links recognition library with full Unicode support. Prior to 5.0.2, the mailto: schema validator used by .test() and .match() can be invoked at every mailto: occurrence and scan the remaining input through src_email_name in lib/re.mjs, causing O(n^2) CPU consumption on crafted user text. This issue is fixed in version 5.0.2.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-09 14:40 UTC
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
GitHub_M
CNA
References
3 references
| URL | Tags |
|---|---|
| https://github.com/markdown-it/linkify-it/securit… | x_refsource_CONFIRM |
| https://github.com/markdown-it/linkify-it/commit/… | x_refsource_MISC |
| https://github.com/markdown-it/linkify-it/release… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| markdown-it | linkify-it |
Affected:
< 5.0.2
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CVE-2026-59885 (GCVE-0-2026-59885)
Vulnerability from cvelistv5 – Published: 2026-07-14 16:40 – Updated: 2026-07-14 17:32
VLAI
EPSS
VEX
Title
pyasn1: Quadratic complexity in OBJECT IDENTIFIER and RELATIVE-OID processing allows denial of service
Summary
pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the BER, CER, and DER decoders process OBJECT IDENTIFIER and RELATIVE-OID values in quadratic time relative to the number of arcs, so a small crafted payload containing an OID with many arcs consumes excessive CPU per decode() call and can deny service to applications that decode untrusted ASN.1 data. The corresponding encoders have the same quadratic behavior when an application re-encodes previously decoded attacker-supplied values. This issue is fixed in version 0.6.4.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-14 17:32 UTC
Assigner
GitHub_M
CNA
References
3 references
| URL | Tags |
|---|---|
| https://github.com/pyasn1/pyasn1/security/advisor… | x_refsource_CONFIRM |
| https://github.com/pyasn1/pyasn1/commit/45bdb19eb… | x_refsource_MISC |
| https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4 | x_refsource_MISC |
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CVE-2026-59880 (GCVE-0-2026-59880)
Vulnerability from cvelistv5 – Published: 2026-07-08 15:44 – Updated: 2026-07-08 16:13
VLAI
EPSS
VEX
Title
Immutable.js: Hash-collision algorithmic complexity denial of service in Immutable.Map/Set
Summary
Immutable.js provides many Persistent Immutable data structures. Prior to 4.3.9 and 5.1.8, Immutable.Map and Immutable.Set keep keys that share the same 32-bit hash in a HashCollisionNode collision bucket that is scanned linearly, allowing an attacker who controls keys inserted into a Map, such as through Immutable.Map(obj), Immutable.fromJS(obj), state.merge(userObject), or mergeDeep, to craft many colliding keys and degrade insertion and lookup to consume disproportionate CPU. This issue is fixed in versions 4.3.9 and 5.1.8.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-08 16:13 UTC
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
GitHub_M
CNA
References
5 references
| URL | Tags |
|---|---|
| https://github.com/immutable-js/immutable-js/secu… | x_refsource_CONFIRM |
| https://github.com/immutable-js/immutable-js/comm… | x_refsource_MISC |
| https://github.com/immutable-js/immutable-js/comm… | x_refsource_MISC |
| https://github.com/immutable-js/immutable-js/rele… | x_refsource_MISC |
| https://github.com/immutable-js/immutable-js/rele… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| immutable-js | immutable-js |
Affected:
< 4.3.9
Affected: >= 5.0.0-beta.1, < 5.1.8 |
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No mitigation information available for this CWE.
No CAPEC attack patterns related to this CWE.