High severity · published Oct 21, 2026
CVE-2026-112212
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') in GitLab
New
7.5
CVSS
0.2%
EPSS
No
On KEV
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 URLs in cached discovery responses.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:L
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
Low
Availability
Low
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 9% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GI
GitLab · GitLab
18.3 before 19.3.6; 19.4 before 19.4.3; 19.5 before 19.5.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-112212
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-112212
Release Notes
https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-5-1-released/
Permissions Required
https://gitlab.com/gitlab-org/gitlab/-/work_items/627499
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