CVE-2026-111273 Details
Description
unarr through 1.1.1 contains an off-by-one heap-based buffer overflow in tar_get_name() in tar/parse-tar.c, reachable through the ar_entry_get_name() API. Attackers can supply a crafted TAR archive with a full ustar prefix and name to write a NUL byte past the allocation, corrupting heap memory and crashing the process.
A heap-based buffer overflow vulnerability has been identified in the unarr library, specifically in versions through 1.1.1. The issue arises in the TAR parsing function 'tar_get_name()', located in 'tar/parse-tar.c'. This vulnerability is accessible through the 'ar_entry_get_name()' API. Attackers can exploit this flaw by providing a crafted TAR archive that includes a full ustar prefix and name. The manipulation causes a NUL byte to be written beyond the allocated buffer, leading to heap memory corruption and crashing the process.
Users are advised to update to the latest version of unarr, where this vulnerability has been fixed. The official GitHub repository contains the patched version.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 15, 2026CISA-ADP
Assessed Oct 16, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-193 | Off-by-one Error | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| unarr | <= 1.1.1 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 16, 2026 | CVE Modified | CISA-ADP |
| Oct 15, 2026 | New CVE Received | [email protected] |