CVE-2026-126831 - Cpio: cpio: stack-based buffer overflow in write_out_tar_header() with long usernames/groupnames

CVE-2026-126831 - Cpio: cpio: stack-based buffer overflow in write_out_tar_header() with long usernames/groupnames

https://cvefeed.io/rssfeed/latest.atom / Thu, 11/12/2026 - 20:08
CVE ID :CVE-2026-126831
Published : Nov. 12, 2026, 6:17 p.m. | 42 minutes ago
Description :A flaw was found in cpio. A local user can cause a Denial of Service (DoS) by triggering a stack-based buffer overflow when creating archives in tar or ustar formats. When archiving files owned by users or groups with names exceeding 32 characters, cpio copies these names into fixed-size memory without verifying their length. This unbounded copy corrupts stack memory and causes the application to crash.
Severity: 5.5 | MEDIUM
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