CVE-2026-66485
Uncontrolled Memory Allocation in GNU cpio
- State
- Published
- Severity
- 4.6 Medium
- Published
- Aug 10, 2026
- Updated
- Aug 10, 2026
- Reserved
- Jul 27, 2026
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
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 4.6 Medium | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | CERT-PL |
Weaknesses
- CWE-789 Memory allocation with excessive size value
Affected Products
| Product | Versions |
|---|---|
cpioGNU |
|
References
- https://cert.pl/en/posts/2026/08/CVE-2026-66484third-party-advisory
- https://git.savannah.gnu.org/cgit/cpio.gitproduct
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