gitlab — security advisory

{
  "id": "e904175aae39572296c5d31936801ef6dba904b831a13703eb71eeb9b6999a6a",
  "url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-100755",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "UBUNTU-CVE-2026-100755",
    "summary": "GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.2 before 19.2.8, 19.3 before 19.3.5, and 19.4 before 19.4.2 that, under certain deployment configurations, could have allowed an authenticated user to poison cached page content served to other users due to improper cache key construction.",
    "evidence": "osv:UBUNTU-CVE-2026-100755",
    "products": [
      {
        "name": {
          "value": "gitlab",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "8.4.3+dfsg-9",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "8.4.3+dfsg-12",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "8.5.8+dfsg-5",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "UBUNTU-CVE-2026-100755",
      "aliases": [
        "UBUNTU-CVE-2026-100755"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L"
        },
        {
          "type": "Ubuntu",
          "score": "medium"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "gitlab",
            "purl": "pkg:deb/ubuntu/gitlab?arch=source&distro=xenial",
            "ecosystem": "Ubuntu:16.04:LTS"
          },
          "versions": [
            "8.4.3+dfsg-9",
            "8.4.3+dfsg-12",
            "8.5.8+dfsg-5"
          ],
          "database_specific": {
            "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-100755.json"
          },
          "ecosystem_specific": {
            "binaries": [
              {
                "binary_name": "gitlab",
                "binary_version": "8.5.8+dfsg-5"
              }
            ]
          }
        }
      ],
      "modified": "2026-10-17T12:59:43.155329190Z",
      "provider": "osv",
      "upstream": [
        "CVE-2026-100755"
      ],
      "references": [
        "https://ubuntu.com/security/CVE-2026-100755",
        "https://www.cve.org/CVERecord?id=CVE-2026-100755",
        "https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-4-2-released/",
        "https://gitlab.com/gitlab-org/gitlab/-/work_items/627507"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2026-100755",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 359730,
  "published_at": "2026-10-13T02:16:00+00:00"
}