CVE-2025-12983
Memory Allocation with Excessive Size Value in GitLab
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated attacker to cause a denial of service condition by submitting specially crafted markdown content with nested formatting patterns.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Memory Allocation with Excessive Size Value in GitLab
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated attacker to cause a denial of service condition by submitting specially crafted markdown content with nested formatting patterns.
- Record
CVE-2025-12983- CVSS 3.1
- 3.5 Low
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L - Weakness
- CWE-789
- Updated
- 2026-11-02
EUVDEUVD-2025-197698
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated attacker to cause a denial of service condition by submitting specially crafted markdown content with nested formatting patterns.
- Record
EUVD-2025-197698- CVSS 3.1
- 3.5 Low
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-9mv9-gw4x-7xw4
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9 before 18.3.6, 18...
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated attacker to cause a denial of service condition by submitting specially crafted markdown content with nested formatting patterns.
- Record
GHSA-9mv9-gw4x-7xw4- CVSS 3.1
- 3.5 Low
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L - Weakness
- CWE-789
- Updated
- 2026-11-02
NVD
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated attacker to cause a denial of service condition by submitting specially crafted markdown content with nested formatting patterns.
- Record
CVE-2025-12983- CVSS 3.1
- 3.5 Low
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-789
- Updated
- 2026-11-02
OSV
Memory Allocation with Excessive Size Value in GitLab
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated attacker to cause a denial of service condition by submitting specially crafted markdown content with nested formatting patterns.
- Record
CVE-2025-12983- CVSS 3.1
- 3.5 Low
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L - Weakness
- CWE-789
- Updated
- 2026-11-02
OSVUBUNTU-CVE-2025-12983
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated attacker to cause a denial of service condition by submitting specially crafted markdown content with nested formatting patterns.
- Record
UBUNTU-CVE-2025-12983- CVSS 3.1
- 3.5 Low
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:L - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVBIT-gitlab-2025-12983 No score
Memory Allocation with Excessive Size Value in GitLab
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.9 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated attacker to cause a denial of service condition by submitting specially crafted markdown content with nested formatting patterns.
- Record
BIT-gitlab-2025-12983- Updated
- 2026-11-02
Affected products
Affected packages
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-12983 is a low vulnerability (CVSS 3.5) in Gitlab, published November 15, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.45%, the 39th percentile. Fixed in gitlab 18.3.6.
References
about.gitlab.com/releases/2025/11/12/patch-release-gitlab-18-5-2-released
gitlab.com/gitlab-org/gitlab/-/issues/296257
hackerone.com/reports/3419588
nvd.nist.gov/vuln/detail/CVE-2025-12983
github.com/advisories/GHSA-9mv9-gw4x-7xw4
ubuntu.com/security/CVE-2025-12983
cve.org/CVERecord?id=CVE-2025-12983