{"id":"CVE-2026-104608","aliases":["EUVD-2026-116581","GHSA-8r7w-x58w-955w"],"status":"published","title":"Use-after-free vulnerability in GitHub Enterprise Server allowed remote code execution in the Git service","description":"A remote code execution vulnerability was identified in GitHub Enterprise Server in the Git service (babeld). babeld held references into internal collections while calling into the SSH library, where a re-entrant callback could modify a collection and invalidate those references. An attacker with an account and SSH access to the instance could leverage this use-after-free into a controlled write and run arbitrary commands as babeld, including disclosure of its environment secrets. Exploitation required per-build memory offsets; failed attempts crashed babeld. This affected all releases prior to 3.23 and was fixed in 3.22.3, 3.21.8, 3.20.10, and 3.19.14. This vulnerability was reported via the GitHub Bug Bounty program.","severity":{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.004,"percentile":0.34788,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1265","CWE-416"],"published":"2026-11-03T22:49:48Z","modified":"2026-11-06T19:10:37Z","products":[{"vendor":"github","product":"enterprise server"}],"references":[{"url":"https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.14","tags":["release-notes"]},{"url":"https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.10","tags":["release-notes"]},{"url":"https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.8","tags":["release-notes"]},{"url":"https://docs.github.com/en/enterprise-server@3.22/admin/release-notes#3.22.3","tags":["release-notes"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-104608"},{"url":"https://github.com/advisories/GHSA-8r7w-x58w-955w"}],"sources":{"cve":[{"id":"CVE-2026-104608","title":"Use-after-free vulnerability in GitHub Enterprise Server allowed remote code execution in the Git service","description":"A remote code execution vulnerability was identified in GitHub Enterprise Server in the Git service (babeld). babeld held references into internal collections while calling into the SSH library, where a re-entrant callback could modify a collection and invalidate those references. An attacker with an account and SSH access to the instance could leverage this use-after-free into a controlled write and run arbitrary commands as babeld, including disclosure of its environment secrets. Exploitation required per-build memory offsets; failed attempts crashed babeld. This affected all releases prior to 3.23 and was fixed in 3.22.3, 3.21.8, 3.20.10, and 3.19.14. This vulnerability was reported via the GitHub Bug Bounty program.","status":"published","published":"2026-11-03T22:49:48.079Z","modified":"2026-11-06T19:10:37.408Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:N/SA:N","level":"high","assessor":"cna"}],"cwes":["CWE-416","CWE-1265"],"updated_at":"2026-11-06T20:30:03.598374Z"}],"euvd":[{"id":"EUVD-2026-116581","description":"A remote code execution vulnerability was identified in GitHub Enterprise Server in the Git service (babeld). babeld held references into internal collections while calling into the SSH library, where a re-entrant callback could modify a collection and invalidate those references. An attacker with an account and SSH access to the instance could leverage this use-after-free into a controlled write and run arbitrary commands as babeld, including disclosure of its environment secrets. Exploitation required per-build memory offsets; failed attempts crashed babeld. This affected all releases prior to 3.23 and was fixed in 3.22.3, 3.21.8, 3.20.10, and 3.19.14. This vulnerability was reported via the GitHub Bug Bounty program.","status":"published","published":"2026-11-03T22:49:48Z","modified":"2026-11-06T19:10:37Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-06T20:06:05.048214Z"}],"ghsa":[{"id":"GHSA-8r7w-x58w-955w","title":"A remote code execution vulnerability was identified in GitHub Enterprise Server in the Git...","description":"A remote code execution vulnerability was identified in GitHub Enterprise Server in the Git service (babeld). babeld held references into internal collections while calling into the SSH library, where a re-entrant callback could modify a collection and invalidate those references. An attacker with an account and SSH access to the instance could leverage this use-after-free into a controlled write and run arbitrary commands as babeld, including disclosure of its environment secrets. Exploitation required per-build memory offsets; failed attempts crashed babeld. This affected all releases prior to 3.23 and was fixed in 3.22.3, 3.21.8, 3.20.10, and 3.19.14. This vulnerability was reported via the GitHub Bug Bounty program.","status":"published","published":"2026-11-04T00:32:15Z","modified":"2026-11-04T00:32:16Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"}],"cwes":["CWE-416"],"updated_at":"2026-11-04T00:48:26.298057Z"}],"nvd":[{"id":"CVE-2026-104608","description":"A remote code execution vulnerability was identified in GitHub Enterprise Server in the Git service (babeld). babeld held references into internal collections while calling into the SSH library, where a re-entrant callback could modify a collection and invalidate those references. An attacker with an account and SSH access to the instance could leverage this use-after-free into a controlled write and run arbitrary commands as babeld, including disclosure of its environment secrets. Exploitation required per-build memory offsets; failed attempts crashed babeld. This affected all releases prior to 3.23 and was fixed in 3.22.3, 3.21.8, 3.20.10, and 3.19.14. This vulnerability was reported via the GitHub Bug Bounty program.","status":"published","published":"2026-11-03T23:17:24.42Z","modified":"2026-11-06T19:17:06.287Z","cvss":[{"version":"4.0","score":7.7,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-416","CWE-1265"],"updated_at":"2026-11-06T22:02:16.475328Z"}]}}