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VulnerabilityPublished Updated

CVE-2025-12983: GitLab · Excessive Memory Allocation

Affects GitLabSource GCVE Database

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Not known to be exploited · CVSS 3.5 Low.

Data as of 13 Nov 2026, 19:39 UTC

CVSS 3.1 base score
3.5Low
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitLab)CVSS 3.13.5
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 Nov 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
GitLab GitLabAffected
  • =16.9
  • =18.4
  • =18.5
Fixed in–

AI-suggested

Apply the official patches provided by GitLab in versions 18.3.6, 18.4.4, and 18.5.2 or later to remediate this vulnerability. Since the vendor has remediated the issue in these releases, upgrading to these fixed versions is the recommended mitigation.

Description

CVE-2025-12983 is a low-severity vulnerability in GitLab CE/EE affecting versions 16.9, 18.4, and 18.5 before specific patch releases. It involves a memory allocation issue triggered by specially crafted markdown content with nested formatting, which could cause a denial of service (DoS) condition. The flaw requires an authenticated attacker and has a high attack complexity with low privileges needed. No confidentiality or integrity impact is reported.

References

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