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

> Attackers can execute arbitrary code by crafting a tarball with malicious member names processed by rpmbuild, affecting Red Hat and related Linux distributions.

- **Severity:** High 7.0 (`CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 24 Aug 2026
- **Updated:** 14 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-78367, ECHO-c708-0d0a-f19b, GHSA-pghw-ch4m-h3f9, OESA-2026-3860, OESA-2026-3861, OESA-2026-3862, OESA-2026-3863, OESA-2026-3928, UBUNTU-CVE-2026-78367

## What is CVE-2026-78367?

CVE-2026-78367 is a high-severity code injection vulnerability in Red Hat Enterprise Linux 10, published on 24 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official 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).

Weakness: CWE-94 (Improper Control of Generation of Code)

## Which versions are affected by CVE-2026-78367?


## How do I fix CVE-2026-78367?

Apply the vendor's patch.

## Is CVE-2026-78367 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-78367 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-78367 and fix it if it is affected.

What it is: CVE-2026-78367 is a high-severity code injection vulnerability in Red Hat Enterprise Linux 10, published on 24 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-78367 exists.

Affected product: Red Hat Enterprise Linux 10. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-78367/ (Markdown: https://insights.sbomify.com/CVE-2026-78367/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-78367
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-78367
- OSV: https://osv.dev/vulnerability/CVE-2026-78367

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-78367/
Summaries are generated and may contain mistakes; the official description above is the record.