Highest advisory severityCritical 2 vendors · 2 advisories

CVE-2026-110264

issue has been discovered in GitLab CE/EE affecting all versions from 7.0 before 18.11.13, 19.0 before 19.0.10, 19.1 before 19.1.9, 19.2 before 19.2.9, 19.3 before 19.3.6, 19.4 before 19.4.3, and 19.5 before 19.5.1 that, under certain conditions, could have allowed an unauthenticated user to execute arbitrary code on the GitLab server due to integer overflow when compiling a specially crafted regular expression

CVE-2026-110264: issue has been discovered in GitLab CE/EE affecting all versions from 7.0 before 18.11.13, 19.0 before 19.0.10, 19.1 before 19.1.9, 19.2…

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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CVE-2026-110264 key facts

CISA KEV: Not listed (catalog checked Nov 2, 2026)
Highest advisory severity: Critical
CVSS base score: 10 (GitLab), 9.8 (Red Hat)
Weakness: CWE-190
Fixed releases: GitLab: 18.11.13, 19.0.10, 19.1.9, 19.2.9, 19.3.6, 19.4.3 and 1 more in the advisory
Red Hat: ruby3-3-main-3.3.13-23.8.hum1, ruby3-4-main-3.4.12-33.1.hum1, ruby4-0-main-4.0.9-41.hum1, RHSA-2026:88861
Vendor advisories: 2 from GitLab, Red Hat
VulniPulse record: Published Oct 22, 2026 · Updated Oct 31, 2026

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-110264; bulletin-wide values are not repeated here.

Is CVE-2026-110264 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-110264 is not in the CISA KEV catalog (checked Nov 2, 2026) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-110264?

Upgrade to a fixed release named by the vendor:

GitLab: 18.11.13, 19.0.10, 19.1.9, 19.2.9, 19.3.6, 19.4.3
Red Hat: ruby3-3-main-3.3.13-23.8.hum1, ruby3-4-main-3.4.12-33.1.hum1, ruby4-0-main-4.0.9-41.hum1, RHSA-2026:88861

To mitigate this vulnerability, do not compile regular expressions from untrusted sources. Standard safeguards such as Regexp.timeout or limiting the length of the input pattern do not protect against this issue. (Red Hat)

Vendor advisory comparison

GitLab

1 advisory

Advisory severityCritical10.0
Critical [CVE-2026-110264] issue has been discovered in GitLab CE/EE affecting all versions from 7.0 before 18.11.13, 19.0 before 19.0.10, 19.1 before 19.1.9, 19.2 before 19.2.9, 19.3 before 19.3.6, 19.4 before 19.4.3, and 19.5 before 19.5.1 that, under certain conditions, could have allowed an unauthenticated user to execute arbitrary code on the GitLab server due to integer overflow when compiling a specially crafted regular expression
CVE-2026-110264Source published Oct 22, 2026Source updated Oct 31, 2026
An issue has been discovered in GitLab CE/EE affecting all versions from 7.0 before 18.11.13, 19.0 before 19.0.10, 19.1 before 19.1.9, 19.2 before 19.2.9, 19.3 before 19.3.6, 19.4 before 19.4.3, and 19.5 before 19.5.1 that, under certain conditions, could have allowed an unauthenticated user to execute arbitrary code on the GitLab server due to integer overflow when compiling a specially crafted regular expression.
Affected products in this advisory
GitLab
Source-reported affected versions
before 18.11.13
before 19.0.10
before 19.1.9
before 19.2.9
3 more entries in the full advisory.
Source-reported fixed versions
18.11.13
19.0.10
19.1.9
19.2.9
3 more entries in the full advisory.
Mitigation guidance
No mitigation guidance extracted; consult the source.
Full advisory and evidence Open source bulletin

Red Hat

1 advisory

Advisory severityCritical9.8
Critical [CVE-2026-110264] integer overflow issue in regular expression compiler
CVE-2026-110264Source published Oct 22, 2026Source updated Oct 22, 2026
integer overflow issue in regular expression compiler. Red Hat rates this critical (CVSS 9.8). Weakness: CWE-190. Red Hat lists fixing advisory RHSA-2026:88861 with package ruby3-3-main-3.3.13-23.8.hum1, ruby3-4-main-3.4.12-33.1.hum1, ruby4-0-main-4.0.9-41.hum1. Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; and 4 more.
Related products — impact not confirmed
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
4 more entries in the full advisory.
Source-reported affected versions
< 7.0
< 18.11.13
< 19.0
< 19.0.10
10 more entries in the full advisory.
Source-reported fixed versions
ruby3-3-main-3.3.13-23.8.hum1
ruby3-4-main-3.4.12-33.1.hum1
ruby4-0-main-4.0.9-41.hum1
RHSA-2026:88861
Mitigation guidance
To mitigate this vulnerability, do not compile regular expressions from untrusted sources. Standard safeguards such as Regexp.timeout or limiting the length of the input pattern do not protect against this issue.
Full advisory and evidence Open source bulletin

All GitLab advisories

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