Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') in GitLab

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-112212
StatePUBLISHED
AssignerGitLab
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-22 01:16:57 UTC
Updated2026-10-22 16:18:19 UTC
DescriptionGitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.3 before 19.3.6, 19.4 before 19.4.3, and 19.5 before 19.5.1 that, under certain conditions, an unauthenticated user could have poisoned a shared cache's OAuth/OIDC discovery document to redirect certain flows to an externally controlled server, due to improper trust of user-supplied values when constructing endpoint URLs in cached discovery responses.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

Problem Types: CWE-444 | CWE-444 CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:L
3.1CNACVSS7.5HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:L

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA GitLab GitLab affected 18.3 19.3.6 semver Not specified
CNA GitLab GitLab affected 19.4 19.4.3 semver Not specified
CNA GitLab GitLab affected 19.5 19.5.1 semver Not specified

References

ReferenceSourceLinkTags
docs.gitlab.com/releases/patches/patch-release-gitlab-19-5-1-released [email protected] docs.gitlab.com
gitlab.com/gitlab-org/gitlab/-/work_items/627499 [email protected] gitlab.com
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 Peter Arts (en)

Additional Advisory Data

Solutions

CNA: Upgrade to versions 19.3.6, 19.4.3, 19.5.1 or above.

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