CVE-2026-66485
Publication date 10 August 2026
Last updated 1 September 2026
Ubuntu priority
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
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| cpio | 26.04 LTS resolute |
Fixed 2.15+dfsg-2.1ubuntu0.1
|
| 24.04 LTS noble |
Fixed 2.15+dfsg-1ubuntu2.1
|
|
| 22.04 LTS jammy |
Fixed 2.13+dfsg-7ubuntu0.2
|
|
| 20.04 LTS focal |
Fixed 2.13+dfsg-2ubuntu0.4+esm1
|
|
| 18.04 LTS bionic |
Fixed 2.12+dfsg-6ubuntu0.18.04.4+esm1
|
|
| 16.04 LTS xenial |
Fixed 2.11+dfsg-5ubuntu1.1+esm2
|
|
| 14.04 LTS trusty |
Fixed 2.11+dfsg-1ubuntu1.2+esm3
|
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CVSS version: CVSS v4.0
Base score
4.6 · Medium
Vector: 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
References
Related Ubuntu Security Notices (USN)
- USN-8704-1
- GNU cpio vulnerabilities
- 31 August 2026