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SSRF in GitLab Repository Mirroring

IdentifiersCVE-2026-12635CWE-918

CVE-2026-12635 is a server-side request forgery vulnerability in GitLab Community Edition and Enterprise Edition Repository Mirroring. It affects all versions from 8.3 before 18.11.6, 19.0 before 19.0.3, and 19.1 before 19.1.1. Due to improper URL validation during mirror synchronization, an authenticated user with Maintainer-role permissions could, under certain conditions, cause GitLab to issue requests to internal network resources via the mirroring mechanism.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows a Maintainer-level authenticated user to leverage the GitLab server as a proxy to access internal network resources that would not normally be directly reachable by that user. This can expose internal services and potentially sensitive information reachable from the GitLab host, and may enable further internal network reconnaissance or interaction with trusted internal endpoints.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, restrict or disable repository mirroring where feasible, especially for users with Maintainer privileges. Limit the GitLab instance’s outbound network access to internal address space and sensitive services using egress filtering, firewall rules, or network segmentation. Review and constrain which destinations the GitLab host can reach during mirror synchronization.

Remediation

Patch, then assume compromise.

Upgrade GitLab CE/EE to a fixed version: 18.11.6, 19.0.3, 19.1.1, or later. GitLab stated that self-managed customers should upgrade immediately. GitLab.com was already patched, and GitLab Dedicated customers required no action according to the vendor notice.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

ACTIVITY FEED

Recent activity

4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

4 SOURCESView more in app
What this page doesn’t show

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Exposure mapping

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Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity2

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-12635
NVD
nvd.nist.gov/vuln/detail/CVE-2026-12635
MITRE CWE · CWE-918
cwe.mitre.org