Uncontrolled Memory Allocation in GNU cpio
CVE-2026-66485 is fixed in 2 products on 1 platform, first by cpio 2.15+dfsg-2.1ubuntu0.1, released August 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| cpio · Ubuntu 18.04.6 LTS (bionic) | 2.12+dfsg-6ubuntu0.18.04.4+esm1 | cpio 2.12+dfsg-6ubuntu0.18.04.4+esm1 | Sep 3, 2026 |
| cpio · Ubuntu 20.04 LTS (focal) | 2.13+dfsg-2ubuntu0.4+esm1 | cpio 2.13+dfsg-2ubuntu0.4+esm1 | Sep 3, 2026 |
| cpio · Ubuntu 22.04.1 LTS (jammy) | 2.13+dfsg-7ubuntu0.2 | cpio 2.13+dfsg-7ubuntu0.2 | Sep 3, 2026 |
| cpio · Ubuntu 24.04.5 LTS (noble) | 2.15+dfsg-1ubuntu2.1 | cpio 2.15+dfsg-1ubuntu2.1 | Sep 3, 2026 |
| cpio · Ubuntu 26.04.1 LTS (resolute) | 2.15+dfsg-2.1ubuntu0.1 | cpio 2.15+dfsg-2.1ubuntu0.1 | Aug 10, 2026 |
| cpio · opensuse-leap 16.0 | 2.15-160000.3.1 | OPENSUSE-SU-2026:21747-1 | Sep 3, 2026 |
| cpio · sles 15.7 | 2.13-150400.3.10.1 | SUSE-SU-2026:4012-1 | Sep 7, 2026 |
| cpio · sles 16.0 | 2.15-160000.3.1 | SUSE-SU-2026:23612-1 | Sep 3, 2026 |
| cpio-win32 · Ubuntu 18.04.6 LTS (bionic) | 2.12+dfsg-6ubuntu0.18.04.4+esm1 | cpio-win32 2.12+dfsg-6ubuntu0.18.04.4+esm1 | Sep 3, 2026 |
| cpio-win32 · Ubuntu 20.04 LTS (focal) | 2.13+dfsg-2ubuntu0.4+esm1 | cpio-win32 2.13+dfsg-2ubuntu0.4+esm1 | Sep 3, 2026 |
| cpio-win32 · Ubuntu 22.04.1 LTS (jammy) | 2.13+dfsg-7ubuntu0.2 | cpio-win32 2.13+dfsg-7ubuntu0.2 | Sep 3, 2026 |
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