Out-of-bounds Read in Selmf Unarr
CVE-2026-111274
unarr through 1.1.1 contains a heap-based out-of-bounds read in zip_parse_extra_fields() in zip/parse-zip.c due to an incorrect ZIP64 extra field length check. Attackers can supply a crafted ZIP archive with 0xFFFFFFFF sentinel values and a truncated ZIP64 record to read past the heap buffer and crash the process.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@haind-pwn/unarr-tar-zip-oob (technical-description)
- github.com/selmf/unarr/blob/b211040df83dee513362cdeb9bd87afa26fd5e38/zip/parse-… (technical-description)
- github.com/selmf/unarr (product)
- www.vulncheck.com/advisories/unarr-through-1.1.1-heap-out-of-bounds-read-via-zi… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111274?
- CVE-2026-111274 is a medium-severity vulnerability in Selmf Unarr, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2026-10-15.
- How severe is CVE-2026-111274?
- Medium severity. CVSS v3 base score is 5.5 out of 10.