GitLabCVE-2026-112212

GitLab: request smuggling

CVE-2026-112212 · Published Oct 22, 2026 · updated Oct 30, 2026

High7.5

Fix: upgrade to 19.3.6 or later (3 fixed versions below)

GitLab 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.

Affected versions

Package	Affected	Fixed in
GitLab Product	>= 18.3, < 19.3.6	19.3.6
	>= 19.4, < 19.4.3	19.4.3
	>= 19.5, < 19.5.1	19.5.1

Details and references

CVSS 3.1: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:L
Severity from: the vendor (its own CVE record or advisory)
Weakness: CWE-444

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