CVE-2026-66485

Uncontrolled Memory Allocation in GNU cpio

Published: Aug 10, 2026Updated: Aug 28, 2026 Sources: CVE List NVDCWE-789

N/ACVSS

NVD MITRE

Description

GNU cpio is vulnerable to an uncontrolled memory allocation in the make_path function at src/makepath.c. The function uses alloca to allocate stack memory based on the length of argpath, which is derived from an archive-controlled pathname during extraction. A malicious cpio archive containing a sufficiently long nested pathname causes an unbounded stack allocation, resulting in a stack overflow and crash of the cpio process. An attacker who can supply a crafted cpio archive to a victim who extracts it can cause a denial of service. This issue has been fixed in commit 3cd514031371d8aeeaf2048aa10103e02831aaa9

No summary for this CVE yet.

Weaknesses

CWE-789

Affected Products

GNU

oss-project·USaka g. nu

cpio

OSS Libraries

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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References

https://cert.pl/en/posts/2026/08/CVE-2026-66484

cert.pl

https://git.savannah.gnu.org/cgit/cpio.git

git.savannah.gnu.org

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