HIGH

CVE-2026-101027

Gitea migration SSRF through ALLOWED_DOMAINS address check bypass

CVSS v3

7.7

HIGH

EPSS Score

—

exploit probability

CISA KEV

known exploited

Exploitation

—

SSVC status

Description

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 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.

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Published: 2026-10-06
Last Modified: 2026-10-07

Frequently asked questions

What is CVE-2026-101027?

Is CVE-2026-101027 actively exploited?

Active exploitation of CVE-2026-101027 has not been confirmed.

What is the CVSS score for CVE-2026-101027?

CVE-2026-101027 has a CVSS v3 base score of 7.7 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

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