TI-2026-74026 Aliases CVE-2026-73539

Argument injection in Gitea external renderer allows code execution

LOW 35CWE-88Published 2026-10-14 · Updated 2026-10-18

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: High
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-88.

Summary

Gitea through 1.27.1 passes a URL derived from the markup Context field into external renderer command templates without escaping, which lets crafted input inject extra renderer arguments (CWE-88). Those arguments can load executable filter files, so with a susceptible external renderer such as pandoc, a low-privileged user who can place a filter file at an accessible path can run code as the Gitea service account. The public repository markup endpoint can be reachable without authentication.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Gitea substitutes a URL derived from the markup Context field into external renderer command templates without escaping the reference path before shell-style argument splitting. A crafted Context can inject additional renderer arguments, including options that load executable filter files. On deployments using a susceptible external renderer such as pandoc, a user who can place a filter file at an accessible path can cause it to execute as the Gitea service account; the public repository markup endpoint itself can be reachable without authentication.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00475 41st percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Gitea	Gitea	up to 1.27.1	—	No fix listed	CNA

Gitea VendorGitea Affected up to 1.27.1 Fixed in — No fix listed CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:gitea:gitea::::::::	—	—	Gitea

cpe:2.3:a:gitea:gitea:*:*:*:*:*:*:*:* Versions — — ·Gitea

Remediation

The sources list no fixed version for Gitea.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product

Red Hat

Timeline

2026-10-14 Threatist record created from CVE-2026-73539
2026-10-18 CVSS score added · CISA ADP
2026-10-18 CISA SSVC decision points changed
2026-10-20 Affected versions changed · Red Hat
2026-10-20 CVSS score added · Red Hat

References

Patch 2

Advisory 1

GitHub Security Advisory GHSA-579w-82gf-89m2

Other 2

TI-2026-42785 Gitea before 1.27.1 allows remote code execution via the diffpatch API through Git hook installation. KEVCVSS 3.1CRITICAL 9.8
TI-2026-42033 Improper authorization on OAuth sign-in callback silently re-enables administrator-disabled accounts CVSS 3.1CRITICAL 9.8
TI-2026-40842 Privilege Escalation via Access Token Scope Escalation in API CVSS 3.1CRITICAL 9.8
TI-2026-16922 Gitea Docker image trusts spoofable reverse-proxy headers by default CVSS 3.1CRITICAL 9.8
TI-2026-42043 Team-repository linking endpoint bypasses the RepoAdminChangeTeamAccess organization setting CVSS 3.1CRITICAL 9.1
TI-2026-40381 OIDC userinfo Endpoint Returns Identity Claims Without Enforcing API Token Scopes CVSS 3.1CRITICAL 9.1

See all 240 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences