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Servers and applications

CVE-2026-112212

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

Severity
High 7.5
Published
21 Oct 2026
Last changed
30 Oct 2026
Added to UpHeron
23 Oct 2026
Fixed in
19.3.6, 19.4.3, 19.5.1
Sources
NVD, CVE Program

Description

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…

Affected software

SoftwareAffected versions
GitLabServers and applications · cpe:a:gitlab:gitlab
  • From 18.3.0 before 19.3.6
  • From 19.4.0 before 19.4.3
  • Version 19.5.0
  • From 19.5 before 19.5.1

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-112212
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-112212