What’s Vulnerable › Vulnerabilities

CVE-2026-111273: unarr through 1.1.1 Off-by-One Heap Buffer Overflow via tar_get_name

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-15 · updated 2026-10-16
• Weakness: CWE-193

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.

Affected products

• selmf unarr: through 1.1.1

References

• https://github.com/selmf/unarr
• https://github.com/selmf/unarr/blob/b211040df83dee513362cdeb9bd87afa26fd5e38/tar/parse-tar.c#L242-L254
• https://hackmd.io/@haind-pwn/unarr-tar-zip-oob
• https://www.vulncheck.com/advisories/unarr-through-1.1.1-off-by-one-heap-buffer-overflow-via-tar-get-name
• https://hackmd.io/@haind-pwn/cve-2026-111273-111274-unarr-tar-zip-oob

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