Common Weakness Enumeration
CWE-1333
AllowedInefficient Regular Expression Complexity
Abstraction: Base · Status: Draft
The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.
880 vulnerabilities reference this CWE, most recent first.
CVE-2026-106454 (GCVE-0-2026-106454)
Vulnerability from cvelistv5 – Published: 2026-10-06 19:55 – Updated: 2026-10-07 16:26
VLAI
EPSS
VEX
Title
Twisted: IMAP wildcardToRegexp() ReDoS
Summary
Twisted is an event-based framework for internet applications, supporting Python 3.6+. In 25.5.0 and earlier, wildcardToRegexp() in twisted/mail/imap4.py translates the IMAP asterisk and percent wildcards but passes all other characters from an authenticated client's LIST or LSUB pattern directly to re.compile(), allowing nested or otherwise expensive regular expression constructs to cause catastrophic backtracking when matched against mailbox names. Because Twisted uses a cooperative single-threaded reactor, the blocking match suspends all server input and output for the duration of the match. No fixed release is available as of this review.
Severity
4.3 (Medium)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-07 16:25 UTC
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/twisted/twisted/security/advis… | x_refsource_CONFIRM |
| https://github.com/twisted/twisted/pull/12788 | x_refsource_MISC |
| https://github.com/twisted/twisted/commit/2f8a3c2… | x_refsource_MISC |
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CVE-2026-106104 (GCVE-0-2026-106104)
Vulnerability from cvelistv5 – Published: 2026-10-06 17:14 – Updated: 2026-10-06 17:14
VLAI
EPSS
VEX
Title
Quasar Framework: Super-linear regex backtracking on User-Agent lets one request stall a Quasar SSR server
Summary
Quasar Framework is a framework for building high-performance Vue.js user interfaces. Prior to 2.23.3, Platform.parseSSR() passed an unbounded User-Agent request header to getMatch() in ui/src/plugins/platform/Platform.js, whose browser-detection expressions combined greedy captures with repeated unbounded scans. Platform belongs to autoInstalledPlugins, so this parsing occurs before routing for every SSR request. A crafted unauthenticated request containing repeated version tokens without a terminating Safari token causes super-linear backtracking and blocks the Node.js event loop, delaying every other SSR request. SPA, PWA, Electron, Cordova, Capacitor, browser-extension, and static-site-generation targets are not affected because they do not parse an attacker-controlled request header through this path. This issue is fixed in version 2.23.3.
Severity
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/quasarframework/quasar/securit… | x_refsource_CONFIRM |
| https://github.com/quasarframework/quasar/commit/… | x_refsource_MISC |
| https://github.com/quasarframework/quasar/release… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| quasarframework | quasar |
Affected:
< 2.23.3
|
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CVE-2026-105854 (GCVE-0-2026-105854)
Vulnerability from cvelistv5 – Published: 2026-10-06 16:17 – Updated: 2026-10-06 17:30
VLAI
EPSS
VEX
Title
Payload: ReDoS in Multipart Content-Type Validation
Summary
Payload is a free and open source headless content management system. In versions from 3.0.0 before 3.90.0 and canary versions before 4.0.0-canary.34, a malformed multipart request body can cause multipart Content-Type processing to take an extremely long time, resulting in uncontrolled resource consumption. This issue is fixed in versions 3.90.0 and 4.0.0-canary.34.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 17:29 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/payloadcms/payload/security/ad… | x_refsource_CONFIRM |
| https://github.com/payloadcms/payload/commit/0084… | x_refsource_MISC |
| https://github.com/payloadcms/payload/releases/ta… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| payloadcms | payload |
Affected:
>= 3.0.0, < 3.90.0
Affected: >= 4.0.0-canary.0, < 4.0.0-canary.34 |
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CVE-2026-105646 (GCVE-0-2026-105646)
Vulnerability from cvelistv5 – Published: 2026-10-05 18:58 – Updated: 2026-10-07 21:41
VLAI
EPSS
VEX
Title
Ghost: Regular Expression Denial of Service in Content Import
Summary
Ghost is a Node.js content management system. From 4.0.0 until 6.67.0, a crafted content import file could cause excessive CPU usage, making the Ghost server unresponsive. Exploiting this requires Administrator access. This issue is fixed in version 6.67.0.
Severity
4.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-07 21:41 UTC
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/TryGhost/Ghost/security/adviso… | x_refsource_CONFIRM |
| https://github.com/TryGhost/Ghost/pull/31058 | x_refsource_MISC |
| https://github.com/TryGhost/Ghost/commit/88ae6d6d… | x_refsource_MISC |
| https://github.com/TryGhost/Ghost/releases/tag/v6.66.0 | x_refsource_MISC |
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CVE-2026-105645 (GCVE-0-2026-105645)
Vulnerability from cvelistv5 – Published: 2026-10-05 18:56 – Updated: 2026-10-05 19:08
VLAI
EPSS
VEX
Title
Ghost: Regular Expression Denial of Service in External Media Inliner
Summary
Ghost is a Node.js content management system. From 5.37.0 until 6.67.0, a crafted request to the external media inliner could cause excessive CPU usage, making the Ghost server unresponsive. Exploiting this requires Administrator access. This issue is fixed in version 6.67.0.
Severity
4.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-05 19:08 UTC
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/TryGhost/Ghost/security/adviso… | x_refsource_CONFIRM |
| https://github.com/TryGhost/Ghost/issues/31058 | x_refsource_MISC |
| https://github.com/TryGhost/Ghost/commit/88ae6d6d… | x_refsource_MISC |
| https://github.com/TryGhost/Ghost/releases/tag/v6.66.0 | x_refsource_MISC |
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CVE-2026-105219 (GCVE-0-2026-105219)
Vulnerability from cvelistv5 – Published: 2026-10-04 17:09 – Updated: 2026-10-05 14:55
VLAI
EPSS
VEX
Title
Mammoth.js 1.3.0 before 1.12.3 ReDoS via Style Map Tokeniser
Summary
Mammoth.js 1.3.0 before 1.12.3 contains a regular expression denial of service vulnerability in the style map tokeniser in lib/styles/parser/tokeniser.js due to overlapping regex alternatives. Attackers can supply a crafted .docx with an unterminated quoted string of repeated backslash escapes in mammoth/style-map to block the Node.js event loop.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-05 13:07 UTC
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/mwilliamson/mammoth.js/issues/487 | issue-tracking |
| https://github.com/mwilliamson/mammoth.js/commit/… | patch |
| https://github.com/mwilliamson/mammoth.js/blob/1.… | technical-description |
| https://github.com/mwilliamson/mammoth.js | product |
| https://www.vulncheck.com/advisories/mammoth-js-1… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| mwilliamson | mammoth.js |
Affected:
1.3.0 , < 1.12.3
(semver)
|
Date Public
2026-09-01 00:00
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CVE-2026-104861 (GCVE-0-2026-104861)
Vulnerability from cvelistv5 – Published: 2026-10-02 17:56 – Updated: 2026-10-02 18:20
VLAI
EPSS
VEX
Title
probe-image-size: Quadratic-time Denial of Service in the SVG Parser
Summary
probe-image-size gets image dimensions without downloading the entire file. Prior to 7.4.0, lib/parse_sync/svg.js and lib/parse_stream/svg.js use the searching regular expression /<[-_.:a-zA-Z0-9][^>]*>/, which repeatedly scans to the end of input when attacker-controlled data contains many less-than characters without a closing greater-than character. The synchronous parser converts and scans the full supplied buffer without an input cap, while the streaming parser reparses the complete accumulated SVG prefix for every received chunk. The probe.sync(), probe(stream), and probe(url) entry points can therefore block the Node.js event loop at full CPU, and attacker-controlled chunking can amplify the streaming cost. This issue is fixed in version 7.4.0.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 18:19 UTC
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/nodeca/probe-image-size/securi… | x_refsource_CONFIRM |
| https://github.com/nodeca/probe-image-size/commit… | x_refsource_MISC |
| https://github.com/nodeca/probe-image-size/commit… | x_refsource_MISC |
| https://github.com/nodeca/probe-image-size/commit… | x_refsource_MISC |
| https://github.com/nodeca/probe-image-size/releas… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| nodeca | probe-image-size |
Affected:
< 7.4.0
|
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CVE-2026-104454 (GCVE-0-2026-104454)
Vulnerability from cvelistv5 – Published: 2026-10-02 11:38 – Updated: 2026-10-02 14:50
VLAI
EPSS
VEX
Title
YesWiki before 4.6.7 ReDoS via wakka.php Edit-Preview Endpoint
Summary
YesWiki before 4.6.7 contains an algorithmic-complexity denial of service in the wakka.php formatter due to an O(n^2) markdown-link regex. Unauthenticated attackers can submit a small crafted body of bracket characters to the page-edit preview endpoint to pin PHP-FPM workers and saturate the pool.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 14:47 UTC
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/YesWiki/yeswiki/security/advis… | vendor-advisory |
| https://www.vulncheck.com/advisories/yeswiki-befo… | third-party-advisory |
Impacted products
Date Public
2026-09-01 00:00
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CVE-2026-103043 (GCVE-0-2026-103043)
Vulnerability from cvelistv5 – Published: 2026-09-29 22:51 – Updated: 2026-09-30 19:15
VLAI
EPSS
VEX
Title
anchorme through 3.0.8 Regular Expression Denial of Service
Summary
anchorme through 3.0.8 contains a regular expression denial of service vulnerability in the IPv6 host extraction regex due to catastrophic backtracking. Attackers can supply specially crafted input strings with repeated patterns to cause exponential regex engine backtracking, blocking the Node.js event loop and denying service to other requests.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 19:13 UTC
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://gist.github.com/mmadersbacher/46050b4224e… | third-party-advisory |
| https://github.com/alexcorvi/anchorme.js/blob/f3a… | technical-description |
| https://www.npmjs.com/package/anchorme | product |
| https://github.com/alexcorvi/anchorme.js | product |
| https://www.vulncheck.com/advisories/anchorme-thr… | third-party-advisory |
Impacted products
Date Public
2026-09-29 00:00
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CVE-2026-102990 (GCVE-0-2026-102990)
Vulnerability from cvelistv5 – Published: 2026-09-30 19:44 – Updated: 2026-09-30 20:05
VLAI
EPSS
VEX
Title
basic-ftp: Quadratic-time CPU denial of service in Client.list() Unix directory-listing parser (RE_LINE backtracking)
Summary
basic-ftp is an FTP client for Node.js. Prior to 6.2.1, Client.list() can be forced by a malicious or compromised FTP server to spend quadratic CPU time parsing a directory listing because the RE_LINE expression in src/parseListUnix.ts backtracks across adjacent variable-length owner and group fields when a long Unix-style line has a valid prefix but cannot satisfy the later size and date fields. parseList() selects a parser from the last nonblank line and then applies it to every line, so a normal final line can select the Unix parser while an earlier crafted line blocks the Node.js event loop and freezes the process. This issue is fixed in version 6.2.1.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 20:05 UTC
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/patrickjuchli/basic-ftp/securi… | x_refsource_CONFIRM |
| https://github.com/patrickjuchli/basic-ftp/commit… | x_refsource_MISC |
| https://github.com/patrickjuchli/basic-ftp/releas… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| patrickjuchli | basic-ftp |
Affected:
< 6.2.1
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Mitigation
Architecture and Design
Use regular expressions that do not support backtracking, e.g. by removing nested quantifiers.
Mitigation
System Configuration
Set backtracking limits in the configuration of the regular expression implementation, such as PHP's pcre.backtrack_limit. Also consider limits on execution time for the process.
Mitigation
Implementation
Do not use regular expressions with untrusted input. If regular expressions must be used, avoid using backtracking in the expression.
Mitigation
Implementation
Limit the length of the input that the regular expression will process.
CAPEC-492: Regular Expression Exponential Blowup
An adversary may execute an attack on a program that uses a poor Regular Expression(Regex) implementation by choosing input that results in an extreme situation for the Regex. A typical extreme situation operates at exponential time compared to the input size. This is due to most implementations using a Nondeterministic Finite Automaton(NFA) state machine to be built by the Regex algorithm since NFA allows backtracking and thus more complex regular expressions.