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.
812 vulnerabilities reference this CWE, most recent first.
CVE-2026-16270 (GCVE-0-2026-16270)
Vulnerability from cvelistv5 – Published: 2026-07-22 12:37 – Updated: 2026-07-22 18:55 X_Open Source
VLAI
EPSS
VEX
Title
ReDoS in Open Mercato
Summary
Open Mercato does not validate regex rules. An attacker with privileges to create the regex rule can add an unsafe regex to a field. When someone provide the proper string it can result in a DoS attack.
This issue was fixed in version 0.6.4.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-22 18:55 UTC
CWE
- CWE-1333 - Inefficient regular expression complexity
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://cert.pl/posts/2026/07/CVE-2026-16270 | third-party-advisory |
| https://www.openmercato.com/ | product |
| https://github.com/open-mercato/open-mercato/pull/1996 | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Open Mercato | Open Mercato |
Affected:
0 , < 0.6.4
(semver)
|
Date Public
2026-07-22 12:32
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CVE-2026-15154 (GCVE-0-2026-15154)
Vulnerability from cvelistv5 – Published: 2026-07-08 19:50 – Updated: 2026-09-08 22:46
VLAI
EPSS
VEX
Title
Guardrails-detectors: guardrails-detectors: unauthenticated regular-expression denial of service (redos) via detector_params.regex
Summary
A flaw was found in `guardrails-detectors`, a component of Red Hat OpenShift AI. This vulnerability, known as Regular Expression Denial of Service (ReDoS), allows a remote attacker to provide specially crafted regular expressions to the public detection API. This can cause catastrophic backtracking, leading to a worker process consuming 100% CPU indefinitely and resulting in a denial of service for the entire guardrails-mediated LLM pipeline.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-08 20:38 UTC
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://access.redhat.com/errata/RHSA-2026:53261 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:53262 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:53263 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:60520 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:65126 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/security/cve/CVE-2026-15154 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2498188 | issue-trackingx_refsource_REDHAT |
Impacted products
6 products
| Vendor | Product | Version | |
|---|---|---|---|
|
Affected:
0 , < d857e059f8a2dedb5c7ea9a2c307c4cfd7983fd1
(git)
|
|||
| Red Hat | Red Hat OpenShift AI 2.25 |
Unaffected:
1784230964 , < *
(rpm)
cpe:/a:redhat:openshift_ai:2.25::el9 |
|
| Red Hat | Red Hat OpenShift AI 2.25 |
Unaffected:
1787235925 , < *
(rpm)
cpe:/a:redhat:openshift_ai:2.25::el9 |
|
| Red Hat | Red Hat OpenShift AI 3.3 |
Unaffected:
1785137880 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.3::el9 |
|
| Red Hat | Red Hat OpenShift AI 3.4 |
Unaffected:
1783569145 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.4::el9 |
|
| Red Hat | Red Hat OpenShift AI 3.4 |
Unaffected:
1786617316 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.4::el9 |
Date Public
2026-07-08 18:43
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CVE-2026-14895 (GCVE-0-2026-14895)
Vulnerability from cvelistv5 – Published: 2026-07-07 22:12 – Updated: 2026-07-08 14:05
VLAI
EPSS
VEX
Title
String::Util versions before 1.36 for Perl are susceptible to a regular expression denial of service
Summary
String::Util versions before 1.36 for Perl are susceptible to a regular expression denial of service.
The trim and rtrim functions stripped trailing whitespace with s/\s*$//u. Because \s* matches greedily and the $ anchor fails whenever a non-whitespace character follows the whitespace, the regex engine retries the match at each offset of a long whitespace run, producing quadratic backtracking. The fix replaces \s*$ with \s+$.
Any caller that passes untrusted input to trim or rtrim can trigger CPU exhaustion with a string containing a long run of whitespace.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-08 14:05 UTC
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| BAKERSCOT | String::Util |
Affected:
0 , < 1.36
(custom)
|
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CVE-2026-14741 (GCVE-0-2026-14741)
Vulnerability from cvelistv5 – Published: 2026-07-17 15:20 – Updated: 2026-08-12 18:47
VLAI
EPSS
VEX
Title
HTTP::Date versions before 6.08 for Perl allow CPU exhaustion via polynomial regex backtracking in parse_date
Summary
HTTP::Date versions before 6.08 for Perl allow CPU exhaustion via polynomial regex backtracking in parse_date.
parse_date() matches the date string against a chain of alternative regexes, and str2time() delegates to it. Several of these patterns place unbounded quantifiers next to each other before a trailing `\s*$` anchor. A valid date prefix followed by a long interior run of digits, letters, or whitespace and a single trailing byte that defeats the final match forces the engine to repartition the run, giving polynomial (about quadratic) backtracking. A header value of a few tens of kilobytes runs for tens of seconds of CPU.
HTTP::Date parses timestamps such as HTTP `Date`, `Expires`, and `Last-Modified` headers, which commonly originate from untrusted sources. Any caller that passes an untrusted date header to str2time() or parse_date() can be driven to consume unbounded CPU, a denial of service.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-12 18:47 UTC
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
4 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| OALDERS | HTTP::Date |
Affected:
0 , < 6.08
(custom)
|
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CVE-2026-11478 (GCVE-0-2026-11478)
Vulnerability from cvelistv5 – Published: 2026-06-08 02:00 – Updated: 2026-06-08 10:59
VLAI
EPSS
VEX
Title
kokke tiny-regex-c Pattern re.c matchstar redos
Summary
A flaw has been found in kokke tiny-regex-c up to f2632c6d9ed25272987471cdb8b70395c2460bdb. This vulnerability affects the function matchstar of the file re.c of the component Pattern Handler. This manipulation causes inefficient regular expression complexity. The attack is restricted to local execution. The exploit has been published and may be used. This product adopts a rolling release strategy to maintain continuous delivery. Therefore, version details for affected or updated releases cannot be specified. The project was informed of the problem early through an issue report but has not responded yet.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-08 10:59 UTC
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/369098 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/369098/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-11478 | third-party-advisory |
| https://vuldb.com/submit/833966 | third-party-advisory |
| https://github.com/kokke/tiny-regex-c/issues/100 | issue-tracking |
| https://github.com/user-attachments/files/2804621… | exploit |
| https://github.com/kokke/tiny-regex-c/ | product |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| kokke | tiny-regex-c |
Affected:
f2632c6d9ed25272987471cdb8b70395c2460bdb
cpe:2.3:a:kokke:tiny-regex-c:*:*:*:*:*:*:*:* |
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CVE-2026-10692 (GCVE-0-2026-10692)
Vulnerability from cvelistv5 – Published: 2026-06-02 23:45 – Updated: 2026-06-03 14:10 X_Open Source
VLAI
EPSS
VEX
Title
johnhuang316 code-index-mcp search_code_advanced is_safe_regex_pattern redos
Summary
A weakness has been identified in johnhuang316 code-index-mcp up to 2.14.0. Affected is the function is_safe_regex_pattern of the component search_code_advanced. Executing a manipulation of the argument regex can lead to inefficient regular expression complexity. It is possible to launch the attack remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 2.14.1 is able to address this issue. This patch is called 25bc02fac74051ddae15ce79e952f00211b1ea6b. Upgrading the affected component is recommended.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-03 14:10 UTC
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/367961 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/367961/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-10692 | third-party-advisory |
| https://vuldb.com/submit/830786 | third-party-advisory |
| https://github.com/johnhuang316/code-index-mcp/is… | exploitissue-tracking |
| https://github.com/johnhuang316/code-index-mcp/co… | patch |
| https://github.com/johnhuang316/code-index-mcp/re… | patch |
| https://github.com/johnhuang316/code-index-mcp/ | product |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| johnhuang316 | code-index-mcp |
Affected:
2.0
Affected: 2.1 Affected: 2.2 Affected: 2.3 Affected: 2.4 Affected: 2.5 Affected: 2.6 Affected: 2.7 Affected: 2.8 Affected: 2.9 Affected: 2.10 Affected: 2.11 Affected: 2.12 Affected: 2.13 Affected: 2.14.0 Unaffected: 2.14.1 cpe:2.3:a:johnhuang316:code-index-mcp:*:*:*:*:*:*:*:* |
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CVE-2026-10691 (GCVE-0-2026-10691)
Vulnerability from cvelistv5 – Published: 2026-06-02 23:30 – Updated: 2026-06-03 13:47 X_Open Source
VLAI
EPSS
VEX
Title
wonderwhy-er DesktopCommanderMCP start_search search-manager.ts redos
Summary
A security flaw has been discovered in wonderwhy-er DesktopCommanderMCP up to 0.2.38. This impacts an unknown function of the file src/search-manager.ts of the component start_search. Performing a manipulation of the argument SearchResult[] results in inefficient regular expression complexity. It is possible to initiate the attack remotely. The exploit has been released to the public and may be used for attacks. Upgrading to version 0.2.39 will fix this issue. The patch is named 4ce845f8749b6a159b57b38dcc3357f7222a8078. It is suggested to upgrade the affected component.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-03 13:46 UTC
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/367960 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/367960/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-10691 | third-party-advisory |
| https://vuldb.com/submit/830746 | third-party-advisory |
| https://github.com/wonderwhy-er/DesktopCommanderM… | exploitissue-tracking |
| https://github.com/wonderwhy-er/DesktopCommanderM… | issue-trackingpatch |
| https://github.com/wonderwhy-er/DesktopCommanderM… | patch |
| https://github.com/wonderwhy-er/DesktopCommanderM… | patch |
| https://github.com/wonderwhy-er/DesktopCommanderMCP/ | product |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| wonderwhy-er | DesktopCommanderMCP |
Affected:
0.2.0
Affected: 0.2.1 Affected: 0.2.2 Affected: 0.2.3 Affected: 0.2.4 Affected: 0.2.5 Affected: 0.2.6 Affected: 0.2.7 Affected: 0.2.8 Affected: 0.2.9 Affected: 0.2.10 Affected: 0.2.11 Affected: 0.2.12 Affected: 0.2.13 Affected: 0.2.14 Affected: 0.2.15 Affected: 0.2.16 Affected: 0.2.17 Affected: 0.2.18 Affected: 0.2.19 Affected: 0.2.20 Affected: 0.2.21 Affected: 0.2.22 Affected: 0.2.23 Affected: 0.2.24 Affected: 0.2.25 Affected: 0.2.26 Affected: 0.2.27 Affected: 0.2.28 Affected: 0.2.29 Affected: 0.2.30 Affected: 0.2.31 Affected: 0.2.32 Affected: 0.2.33 Affected: 0.2.34 Affected: 0.2.35 Affected: 0.2.36 Affected: 0.2.37 Affected: 0.2.38 Unaffected: 0.2.39 cpe:2.3:a:wonderwhy-er:desktopcommandermcp:*:*:*:*:*:*:*:* |
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CVE-2026-10291 (GCVE-0-2026-10291)
Vulnerability from cvelistv5 – Published: 2026-06-01 20:45 – Updated: 2026-06-02 15:45 X_Open Source
VLAI
EPSS
VEX
Title
Enderfga claw-orchestrator Session Grep Endpoint embedded-server.ts validateRegex redos
Summary
A security vulnerability has been detected in Enderfga claw-orchestrator up to 3.7.0. The impacted element is the function validateRegex of the file claw-orchestrator/src/embedded-server.ts of the component Session Grep Endpoint. The manipulation of the argument body.pattern leads to inefficient regular expression complexity. The attack may be initiated remotely. Upgrading to version 3.7.1 is sufficient to resolve this issue. The identifier of the patch is 3f970a974c65a94555c25af9f2796f11315e4584. It is recommended to upgrade the affected component.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-02 15:43 UTC
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://vuldb.com/vuln/367584 | vdb-entrytechnical-description |
| https://vuldb.com/vuln/367584/cti | signaturepermissions-required |
| https://vuldb.com/cve/CVE-2026-10291 | third-party-advisory |
| https://vuldb.com/submit/826222 | third-party-advisory |
| https://github.com/Enderfga/claw-orchestrator/issues/64 | issue-tracking |
| https://github.com/Enderfga/claw-orchestrator/iss… | issue-tracking |
| https://github.com/Enderfga/claw-orchestrator/com… | patch |
| https://github.com/Enderfga/claw-orchestrator/rel… | patch |
| https://github.com/Enderfga/claw-orchestrator/ | product |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Enderfga | claw-orchestrator |
Affected:
3.0
Affected: 3.1 Affected: 3.2 Affected: 3.3 Affected: 3.4 Affected: 3.5 Affected: 3.6 Affected: 3.7.0 Unaffected: 3.7.1 cpe:2.3:a:enderfga:claw-orchestrator:*:*:*:*:*:*:*:* |
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CVE-2026-8159 (GCVE-0-2026-8159)
Vulnerability from cvelistv5 – Published: 2026-05-12 08:35 – Updated: 2026-05-12 12:33
VLAI
EPSS
VEX
Title
multiparty vulnerable to ReDoS via filename parsing
Summary
multiparty@4.2.3 and lower versions are vulnerable to denial of service via regular expression backtracking in the Content-Disposition filename parameter parser. A crafted multipart upload with a long header value can cause regex matching to take seconds, blocking the event loop. Impact: any service accepting multipart uploads via multiparty is affected. Workarounds: limiting upload sizes at the proxy or gateway layer reduces but does not eliminate the attack surface, since a small header of around 8 KB is sufficient to trigger the vulnerable backtracking. Upgrade to multiparty@4.3.0 or higher.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-12 12:33 UTC
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| multiparty | multiparty |
Affected:
0 , ≤ 4.2.3
(semver)
Unaffected: 4.3.0 (semver) |
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CVE-2026-6850 (GCVE-0-2026-6850)
Vulnerability from cvelistv5 – Published: 2026-07-13 08:13 – Updated: 2026-07-13 13:56
VLAI
EPSS
VEX
Title
Crafted message attachment causes client-side denial of service via markdown parser regex backtracking in Mattermost
Summary
Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to validate the length and content of message attachment field values, which allows an authenticated attacker to cause a denial of service for all users in a channel via a post containing a specially crafted payload that triggers catastrophic backtracking in the client-side markdown parser.. Mattermost Advisory ID: MMSA-2026-00658
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 13:56 UTC
CWE
- CWE-1333 - Inefficient Regular Expression Complexity
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://mattermost.com/security-updates | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Mattermost | Mattermost |
Affected:
11.7.0 , ≤ 11.7.2
(semver)
Affected: 11.6.0 , ≤ 11.6.4 (semver) Affected: 10.11.0 , ≤ 10.11.19 (semver) Unaffected: 11.8.0 Unaffected: 11.7.3 Unaffected: 11.6.5 Unaffected: 10.11.20 |
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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.