{"id":"CVE-2026-101027","title":"When `[migrations] ALLOWED_DOMAINS` was configured, a hostname matching the allow list was accepted without checking its resolved address against the local-network restrictions","summary":"When `[migrations] ALLOWED_DOMAINS` was configured, a hostname matching the allow list was accepted without checking its resolved address against the local-network restrictions. A user who can start repository migrations and control the …","severity":"high","cvss":7.7,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","cwe":["CWE-346"],"vendor":"gitea","product":"gitea","affected":["gitea < 28.0.0"],"patched":["gitea 28.0.0"],"published":"2026-10-06","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:32:39.673","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-101027","references":[{"url":"https://blog.gitea.com/release-of-28.0.0/","label":"88ee5874-cf24-4952-aea0-31affedb7ff2"},{"url":"https://github.com/go-gitea/gitea/pull/39426","label":"88ee5874-cf24-4952-aea0-31affedb7ff2"},{"url":"https://github.com/go-gitea/gitea/releases/tag/v28.0.0","label":"88ee5874-cf24-4952-aea0-31affedb7ff2"},{"url":"https://github.com/go-gitea/gitea/security/advisories/GHSA-fqjr-23c8-gg9m","label":"88ee5874-cf24-4952-aea0-31affedb7ff2"}],"tags":["nvd","cve.org"],"epss":0.00233,"epssPercentile":0.14092,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-07T11:37:40.968109Z"},"ingestedAt":"2026-10-06T20:16:42.499Z","slug":"CVE-2026-101027","body":"## Overview\n\nWhen `[migrations] ALLOWED_DOMAINS` was configured, a hostname matching the allow list was accepted without checking its resolved address against the local-network restrictions. A user who can start repository migrations and control the DNS of an allowed hostname could make it resolve to loopback or private addresses and bypass `ALLOW_LOCALNETWORKS = false`, reaching internal services from the Gitea server. Instances without `ALLOWED_DOMAINS` configured are not affected by this specific bypass.\n\n## Affected\n\n- `gitea < 28.0.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `gitea 28.0.0`","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":42.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":217493,"id":"CVE-2026-101027","ts":1791376249207,"field":"cvss","old":null,"new":"7.7"},{"seq":217492,"id":"CVE-2026-101027","ts":1791376249207,"field":"severity","old":"none","new":"high"}]}