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.
824 vulnerabilities reference this CWE, most recent first.
CVE-2026-23985 (GCVE-0-2026-23985)
Vulnerability from cvelistv5 – Published: 2026-07-30 16:09 – Updated: 2026-07-30 19:16- CWE-1333 - Inefficient Regular Expression Complexity
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Superset |
Affected:
0 , < 6.0.0
(semver)
|
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CVE-2026-23956 (GCVE-0-2026-23956)
Vulnerability from cvelistv5 – Published: 2026-01-22 01:23 – Updated: 2026-05-20 00:53- CWE-1333 - Inefficient Regular Expression Complexity
| URL | Tags |
|---|---|
| https://github.com/lxsmnsyc/seroval/security/advi… | x_refsource_CONFIRM |
| https://github.com/lxsmnsyc/seroval/commit/ce9408… | x_refsource_MISC |
| https://github.com/lxsmnsyc/seroval/blob/v0.2.0/p… | x_refsource_MISC |
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CVE-2026-23897 (GCVE-0-2026-23897)
Vulnerability from cvelistv5 – Published: 2026-02-04 19:18 – Updated: 2026-02-04 19:55- CWE-1333 - Inefficient Regular Expression Complexity
| URL | Tags |
|---|---|
| https://github.com/apollographql/apollo-server/se… | x_refsource_CONFIRM |
| https://github.com/apollographql/apollo-server/co… | x_refsource_MISC |
| https://github.com/apollographql/apollo-server/co… | x_refsource_MISC |
| Vendor | Product | Version | |
|---|---|---|---|
| apollographql | apollo-server |
Affected:
>= 2.0.0, <= 3.13.0
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CVE-2026-22809 (GCVE-0-2026-22809)
Vulnerability from cvelistv5 – Published: 2026-01-13 19:36 – Updated: 2026-01-13 19:47- CWE-1333 - Inefficient Regular Expression Complexity
| URL | Tags |
|---|---|
| https://github.com/AmauriC/tarteaucitron.js/secur… | x_refsource_CONFIRM |
| https://github.com/AmauriC/tarteaucitron.js/commi… | x_refsource_MISC |
| Vendor | Product | Version | |
|---|---|---|---|
| AmauriC | tarteaucitron.js |
Affected:
< 1.29.0
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CVE-2026-22691 (GCVE-0-2026-22691)
Vulnerability from cvelistv5 – Published: 2026-01-10 04:46 – Updated: 2026-01-12 16:48| URL | Tags |
|---|---|
| https://github.com/py-pdf/pypdf/security/advisori… | x_refsource_CONFIRM |
| https://github.com/py-pdf/pypdf/pull/3594 | x_refsource_MISC |
| https://github.com/py-pdf/pypdf/commit/294165726b… | x_refsource_MISC |
| https://github.com/py-pdf/pypdf/releases/tag/6.6.0 | x_refsource_MISC |
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CVE-2026-22178 (GCVE-0-2026-22178)
Vulnerability from cvelistv5 – Published: 2026-03-18 01:34 – Updated: 2026-06-23 16:13 X_Open Source| URL | Tags |
|---|---|
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CVE-2026-21868 (GCVE-0-2026-21868)
Vulnerability from cvelistv5 – Published: 2026-01-08 00:26 – Updated: 2026-01-08 19:06- CWE-1333 - Inefficient Regular Expression Complexity
| URL | Tags |
|---|---|
| https://github.com/FlagForgeCTF/flagForge/securit… | x_refsource_CONFIRM |
| Vendor | Product | Version | |
|---|---|---|---|
| FlagForgeCTF | flagForge |
Affected:
< 2.3.3
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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- CWE-1333 - Inefficient regular expression complexity
| 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 |
| Vendor | Product | Version | |
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| Open Mercato | Open Mercato |
Affected:
0 , < 0.6.4
(semver)
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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- CWE-1333 - Inefficient Regular Expression Complexity
| 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 |
| Vendor | Product | Version | |
|---|---|---|---|
|
Affected:
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|||
| Red Hat | Red Hat OpenShift AI 2.25 |
Unaffected:
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cpe:/a:redhat:openshift_ai:2.25::el9 |
|
| Red Hat | Red Hat OpenShift AI 2.25 |
Unaffected:
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(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 |
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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- CWE-1333 - Inefficient Regular Expression Complexity
| Vendor | Product | Version | |
|---|---|---|---|
| BAKERSCOT | String::Util |
Affected:
0 , < 1.36
(custom)
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Mitigation
Use regular expressions that do not support backtracking, e.g. by removing nested quantifiers.
Mitigation
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
Do not use regular expressions with untrusted input. If regular expressions must be used, avoid using backtracking in the expression.
Mitigation
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.