Improper Neutralization of CRLF Sequences ('CRLF Injection') in GitLab

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Summary

CVECVE-2026-3848
StatePUBLISHED
AssignerGitLab
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-11 16:16:47 UTC
Updated2026-04-16 16:38:34 UTC
DescriptionGitLab has remediated an issue in GitLab CE/EE affecting all versions from 8.11 before 18.7.6, 18.8 before 18.8.6, and 18.9 before 18.9.2 that could have allowed an authenticated user to make unintended internal requests through proxy environments under certain conditions due to improper input validation in import functionality.

Risk And Classification

Primary CVSS: v3.1 5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Problem Types: CWE-93 | CWE-93 CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
3.1CNACVSS5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Gitlab Gitlab All All All All
Application Gitlab Gitlab All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA GitLab GitLab affected 8.11 18.7.6 semver Not specified
CNA GitLab GitLab affected 18.8 18.8.6 semver Not specified
CNA GitLab GitLab affected 18.9 18.9.2 semver Not specified

References

ReferenceSourceLinkTags
about.gitlab.com/releases/2026/03/11/patch-release-gitlab-18-9-2-released [email protected] about.gitlab.com Release Notes, Vendor Advisory
gitlab.com/gitlab-org/gitlab/-/work_items/577298 [email protected] gitlab.com Broken Link
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Thanks [shelld3c](https://hackerone.com/shells3c) for reporting this vulnerability. (en)

Additional Advisory Data

Solutions

CNA: Upgrade to versions 18.7.6, 18.8.6, 18.9.2 or above.

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