CVE-2026-111273
unarr through 1.1.1 Off-by-One Heap Buffer Overflow via tar_get_name
- State
- Published
- Severity
- 6.9 Medium
- Published
- Oct 15, 2026
- Updated
- Oct 16, 2026
- Reserved
- Oct 15, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.1 Medium | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H | VulnCheck |
Weaknesses
- CWE-193 Off-by-one Error
Affected Products
| Product | Versions |
|---|---|
unarrselmf |
|
References
- https://hackmd.io/@haind-pwn/unarr-tar-zip-oobtechnical-description
- https://github.com/selmf/unarr/blob/b211040df83dee513362cdeb9bd87afa26fd5e38/tar/parse-tar.c#L242-L254technical-description
- https://github.com/selmf/unarrproduct
- VulnCheck Advisory: unarr through 1.1.1 Off-by-One Heap Buffer Overflow via tar_get_namethird-party-advisory
- https://hackmd.io/@haind-pwn/cve-2026-111273-111274-unarr-tar-zip-oobexploit
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