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Fencer Vulns
critical 9.9

CVE-2026-87719 in the critical feed json

Deserialization of Untrusted Data in GitLab

published 2026-09-12 58 d ago modified 2026-09-28 41 d ago also BIT-gitlab-2026-87719 , EUVD-2026-76778

cvss
9.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits
0
none known

Summary

GitLab has remediated an issue in GitLab EE affecting all versions from 18.3 before 18.11.12, 19.0 before 19.0.9, 19.1 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could allow an authenticated user with Duo Chat access to obtain Advanced Search instance configurations and sensitive credentials using a specially crafted GraphQL subscription argument to bypass serialization and perform server object lookup.

Patch / fix

  • bitnami gitlab 19.1.8, 19.2.6, 19.3.2
  • GitLab GitLab 18.11.12, 19.0.9, 19.1.8, 19.2.6, 19.3.2

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
56 d ago

Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • hackerone.com https://hackerone.com/reports/4012289 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
OSV 3.1 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
bitnami gitlab
>=18.3.0, <19.1.8
>=19.2.0, <19.2.6
>=19.3.0, <19.3.2
19.1.8
19.2.6
19.3.2

Affected products

  • GitLab GitLab

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.