What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-24 · updated 2026-10-14
• Weakness: CWE-94

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).

Affected products

• Red Hat Enterprise Linux 10: all versions
• Red Hat Enterprise Linux 7: all versions
• Red Hat Enterprise Linux 8: all versions
• Red Hat Enterprise Linux 9: all versions
• Red Hat Hardened Images: all versions — fixed in 6.1.0-1.3.hum1

How to fix

Upgrade to a fixed version: Red Hat Hardened Images 6.1.0-1.3.hum1. Check the vendor advisory for mitigations.

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
• https://github.com/rpm-software-management/rpm/issues/4314

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