---
title: "CVE-2026-58426: Gitea Actions Artifacts V4 signed URL HMAC ambiguity allows cross-repository artifact read and cross-task upload-state write"
url: https://erroneo.us/security/cve/CVE-2026-58426/
description: "CVE-2026-58426 (code.gitea.io/gitea (Go)): Gitea Actions Artifacts V4 signed URL HMAC ambiguity allows cross-repository artifact read and cross-task…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-07-03
date_modified: 2026-07-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-58426"
kev: false
cvss: 9.6
epss: 0.00301
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-58426: Gitea Actions Artifacts V4 signed URL HMAC ambiguity allows cross-repository artifact read and cross-task upload-state write

**Signal:** Critical, preconditions apply. Severe if exploited, but exploitation needs conditions that may not apply to you. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.3% , percentile 22: FIRST’s model estimates a 0.3% chance of exploitation activity in the next 30 days, higher than 22% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Only applies if your dependency tree includes code.gitea.io/gitea (Go) >= 1.22.0, < 1.26.2, fixed in 1.26.2 . Check your lockfile, including transitive dependencies.

## What it is

Gitea Actions Artifacts V4 signed URL HMAC ambiguity allows cross-repository artifact read and cross-task upload-state write

## Affected packages

- Go `code.gitea.io/gitea` >= 1.22.0, < 1.26.2 → fixed: 1.26.2

## Affected products (CVE record)

- Gitea Gitea Open Source Git Server: 1.22.0 <= 1.26.1

## Severity

- Gitea CVSS 3.1: 9.6 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N`
- GitHub CVSS 3.1: 9.6 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.30% probability of exploitation activity in the next 30 days; percentile 22.

## Sources

- [GitHub Security Advisory](https://github.com/go-gitea/gitea/security/advisories/GHSA-hg5r-vq93-9fv6)
- [GitHub Pull Request #37707](https://github.com/go-gitea/gitea/pull/37707)
- [Gitea v1.26.2 Release](https://github.com/go-gitea/gitea/releases/tag/v1.26.2)
- [Gitea v1.26.2 Release Blog Post](https://blog.gitea.com/release-of-1.26.2/)
- [GitHub Advisory GHSA-hg5r-vq93-9fv6](https://github.com/advisories/GHSA-hg5r-vq93-9fv6)
- [CVE.org record CVE-2026-58426](https://www.cve.org/CVERecord?id=CVE-2026-58426)
- [NVD entry CVE-2026-58426](https://nvd.nist.gov/vuln/detail/CVE-2026-58426)
- [github.com](https://github.com/go-gitea/gitea/commit/1c2d5e9b03f71dd12d450b2af9a79f2557b50226)

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Source page: https://erroneo.us/security/cve/CVE-2026-58426/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt