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CVE-2026-26292 – SSRF via LFS Migration Transport Bypass – Gitea before 1.25.5

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Summary

CVE-2026-26292 is a critical Server-Side Request Forgery (SSRF) vulnerability affecting Gitea Open Source Git Server in all versions prior to 1.25.5. The flaw arises because LFS (Large File Storage) push and sync mirror operations do not use the migration HTTP transport layer, thereby bypassing the configured migration transport SSRF protections for those LFS requests. With a CVSS v3.1 score of 9.8 (Critical), this vulnerability allows attackers to coerce the Gitea server into issuing arbitrary HTTP requests to internal network addresses, cloud metadata endpoints, or otherwise unreachable internal APIs.

Technical details

  • Root cause: LFS push and sync mirror operations in Gitea versions before 1.25.5 fail to route through the migration HTTP transport. The migration transport is the designated layer that enforces SSRF protections for outbound HTTP requests; by bypassing it entirely, LFS operations are subject to no such restrictions.
  • Trigger conditions: An attacker can trigger this bypass by initiating LFS push or sync mirror operations against a target Gitea instance. The NVD rates this as requiring no privileges (PR:N), consistent with open-registration Gitea deployments where any user can initiate LFS-enabled repository operations.
  • Attack vector: Network-accessible (AV:N). Gitea is widely deployed as an internet-facing self-hosted Git service, making exposed instances directly reachable.
  • Impact: By crafting LFS requests targeting internal addresses, an attacker can perform internal port scanning, access cloud instance metadata endpoints (e.g., AWS IMDSv1 at 169.254.169.254), and interact with internal APIs from the Gitea server’s network context — resulting in high confidentiality, integrity, and availability impact as assessed by NVD.

Affected software

  • Gitea Open Source Git Server — all versions before 1.25.5

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade Gitea to version 1.25.5 or later. This release introduces migration HTTP transport support for LFS push and sync mirror operations (via patches in PRs #36665 and #36691), closing the bypass.
  • If immediate patching is not feasible: Restrict network-level access to the Gitea instance so that it cannot make outbound requests to internal network ranges or cloud metadata endpoints. Enforce egress filtering at the network perimeter to block the Gitea server from reaching 169.254.169.254 and RFC 1918 address space.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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