Medium severity · published Oct 13, 2026
CVE-2026-100755
Acceptance of Extraneous Untrusted Data With Trusted Data in GitLab
4.6
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 0% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GI
GitLab · GitLab
16.2 before 19.2.8; 19.3 before 19.3.5; 19.4 before 19.4.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-100755
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-100755
gitlab.com
https://gitlab.com/gitlab-org/gitlab/-/work_items/627507
docs.gitlab.com
https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-4-2-released/
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