CVE-2026-100755 Acceptance of Extraneous Untrusted Data With Trusted Data in GitLab

What is CVE-2026-100755?

CVE-2026-100755 is a medium-severity vulnerability in Gitlab Gitlab, published on 13 Oct 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.2 before 19.2.8, 19.3 before 19.3.5, and 19.4 before 19.4.2 that, under certain deployment configurations, could have allowed an authenticated user to poison cached page content served to other users due to improper cache key construction.

Weakness: CWE-349

Which versions are affected by CVE-2026-100755?

1 open source package ship an affected version, including gitlab. It affects 1 product.

Products include Gitlab Gitlab.

How do I fix CVE-2026-100755?

Upgrade gitlab to a fixed version for your release line: 19.2.8, 19.3.5 or 19.4.2.

Is CVE-2026-100755 being exploited?

There is no known exploitation of CVE-2026-100755 in the wild and no public exploit code.

Other vulnerabilities in Gitlab Gitlab

• CVE-2026-97229 GitLab Community Edition and Enterprise Edition Integer Overflow or Wraparound Exploited Critical 10.0
• CVE-2026-85706 GitLab Community Edition and Enterprise Edition Path Traversal Exploited Critical 10.0
• CVE-2023-7028 GitLab Community and Enterprise Editions Improper Access Control Exploited Critical 10.0
• CVE-2021-22205 GitLab Community and Enterprise Editions Remote Code Execution Exploited Critical 10.0
• CVE-2021-39935 GitLab Community and Enterprise Editions Server-Side Request Forgery (SSRF) Exploited Medium 6.8

All Gitlab Gitlab vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-gitlab-2026-100755, GHSA-xw26-h8vq-gff9, MINI-234h-rr9x-vw3c, MINI-2485-v48f-wcvm, MINI-2mvr-6823-3qqx, MINI-3746-7wrq-ww8h and 48 more.