CVE-2026-111273unarr through 1.1.1 Off-by-One Heap Buffer Overflow via tar_get_name
Updated under an hour ago ()
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It affects selmf unarr. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.1 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
- Weakness (CWE)
- CWE-193
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
selmf unarr selmf:unarr (from the name) | through 1.1.1 | CNA record |
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
- https://www.vulncheck.com/advisories/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-oob
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.