Reliance on Reverse DNS Resolution for a Security-Critical Action in GitLab

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-12635
StatePUBLISHED
AssignerGitLab
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 05:16:51 UTC
Updated2026-06-26 18:29:37 UTC
DescriptionGitLab has remediated an issue in GitLab CE/EE affecting all versions from 8.3 before 18.11.6, 19.0 before 19.0.3, and 19.1 before 19.1.1 that under certain conditions could have allowed an authenticated user with maintainer-role permissions to make requests to internal network resources through mirror synchronization due to improper URL validation.

Risk And Classification

Primary CVSS: v3.1 3.1 LOW from [email protected]

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.001530000 probability, percentile 0.048080000 (date 2026-06-29)

Problem Types: CWE-350 | CWE-350 CWE-350: Reliance on Reverse DNS Resolution for a Security-Critical Action

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary3.1LOWCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
3.1[email protected]Secondary0NONECVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:N
3.1CNACVSS0NONECVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Gitlab Gitlab All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA GitLab GitLab affected 8.3 18.11.6 semver Not specified
CNA GitLab GitLab affected 19.0 19.0.3 semver Not specified
CNA GitLab GitLab affected 19.1 19.1.1 semver Not specified

References

ReferenceSourceLinkTags
gitlab.com/gitlab-org/gitlab/-/work_items/594321 [email protected] gitlab.com Broken Link
docs.gitlab.com/releases/patches/patch-release-gitlab-19-1-1-released [email protected] docs.gitlab.com Release Notes, Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: This vulnerability has been discovered internally by GitLab team member Félix Veillette-Potvin (en)

Additional Advisory Data

Solutions

CNA: Upgrade to versions 18.11.6, 19.0.3, 19.1.1 or above.

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