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CVE-2026-112212high7.5

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

Impact

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.

Source excerpt · GitLab
Applies when

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.

What to do

Upgrade to versions 19.3.6, 19.4.3, 19.5.1 or above.

GitLab guidance

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

GitLab · GitLab

GitLab

3 ranges
GitLab version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

18.3 → before 19.3.6

semver versions

19.4 → before 19.4.3

semver versions

19.5 → before 19.5.1

semver versions

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*

Original source 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.

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-112212

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-444 ↗

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

GitLab

Related →
Contributing organizations · 2
GitLab

Assigning organization

2026-10-21
CISA-ADP

Additional data publisher

2026-10-30

What changed

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References

2 sources
gitlab.com/gitlab-org/gitlab/-/work_items/627499
Source referenceGitLab
docs.gitlab.com/releases/patches/patch-release-gitlab-19-5-1-released/
Release notesGitLab