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.
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Thu, 12 Nov 2026 17:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Cpio: cpio: stack-based buffer overflow in write_out_tar_header() with long usernames/groupnames | |
| First Time appeared |
Redhat
Redhat enterprise Linux Redhat hummingbird Redhat rhel Els |
|
| Weaknesses | CWE-121 | |
| CPEs | cpe:/a:redhat:enterprise_linux:10 cpe:/a:redhat:enterprise_linux:8 cpe:/a:redhat:enterprise_linux:9 cpe:/a:redhat:hummingbird:1 cpe:/o:redhat:rhel_els:6 cpe:/o:redhat:rhel_els:7 |
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| Vendors & Products |
Redhat
Redhat enterprise Linux Redhat hummingbird Redhat rhel Els |
|
| References |
| |
| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-11-12T17:27:16.588Z
Reserved: 2026-11-11T21:04:08.843Z
Link: CVE-2026-126831
No data.
Status : Awaiting Analysis
Published: 2026-11-12T18:17:28.583
Modified: 2026-11-12T18:17:28.890
Link: CVE-2026-126831
No data.
OpenCVE Enrichment
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Weaknesses