Denial of Service in GitLab CE/EE SSH Authentication Handling
CVE-2026-1102 is a denial-of-service vulnerability in GitLab Community Edition (CE) and Enterprise Edition (EE). According to the provided content, the issue affects all versions from 12.3 before 18.6.4, 18.7 before 18.7.2, and 18.8 before 18.8.2. An unauthenticated attacker can trigger the flaw by sending repeated malformed SSH authentication requests to a vulnerable GitLab API endpoint or SSH authentication handling path. Successful exploitation can cause the service to enter a denial-of-service condition. The available information does not identify the exact vulnerable function or code path beyond GitLab’s handling of malformed SSH authentication requests.
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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.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A medium-severity denial-of-service (DoS) vulnerability in GitLab exploitable via malformed inputs (crafted requests/authentication data/authorization validation/Wiki documents are mentioned generally, without per-CVE mapping).
A GitLab CE/EE denial-of-service vulnerability that can be triggered via repeated malformed SSH authentication requests.
A medium-severity denial-of-service vulnerability affecting a GitLab API endpoint, triggerable by unauthenticated repeated malformed SSH authentication requests.
Medium-severity denial-of-service vulnerability in GitLab that can be triggered by repeated malformed SSH authentication requests.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.