CVE-2026-111273
unarr through 1.1.1 Off-by-One Heap Buffer Overflow via tar_get_name
CVSS Score
6.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-193 |
| Vendor | selmf |
| Product | unarr |
| Published | Oct 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High
Affected Versions
selmf / unarr
0 ≤ 1.1.1
References
hackmd.io: https://hackmd.io/@haind-pwn/unarr-tar-zip-oob github.com: https://github.com/selmf/unarr/blob/b211040df83dee513362cdeb9bd87afa26fd5e38/tar/parse-tar.c#L242-L254 github.com: https://github.com/selmf/unarr vulncheck.com: https://www.vulncheck.com/advisories/unarr-through-1.1.1-off-by-one-heap-buffer-overflow-via-tar-get-name
Credits
HaiND from the Post and Telecommunication Institute of Technology