Improper Filtering Vulnerability in GitLab CE/EE Affects Multiple Versions
CVE-2026-105777

4.3MEDIUM

Key Information:

Vendor

Gitlab
Status
Gitlab
Vendor
CVE Published:
21 October 2026

What is CVE-2026-105777?

A vulnerability exists in GitLab CE/EE where improper filtering of internal response headers can allow an unauthenticated user to retrieve sensitive internal server credentials. This issue affects several versions, posing a significant risk if left unaddressed. It highlights the importance of securing endpoint responses to prevent unauthorized access to sensitive information. Users are advised to update to the latest versions to mitigate this risk.

Affected Version(s)

GitLab 17.6.5 < 19.3.6

GitLab 19.4 < 19.4.3

GitLab 19.5 < 19.5.1

References

https://gitlab.com/gitlab-org/gitlab/-/work_items/597022
https://hackerone.com/reports/3657282
technical-descriptionexploitpermissions-required
https://docs.gitlab.com/releases/patches/patch-release-gi...

CVSS V3.1

Score:
4.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Thanks [altair00](https://hackerone.com/altair00) for reporting this vulnerability through our HackerOne bug bounty program
.