# CVE-2026-111274: unarr through 1.1.1 Heap Out-of-Bounds Read via zip_parse_extra_fields

Status: published. Published: 2026-10-15. Updated: 2026-11-02.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- selmf / unarr (selmf/unarr): ≥ 0; ≤ 1.1.1 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 6.8 (medium); CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 5.5 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.20% as of 2026-11-01; percentile 9.32%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-125

## Exploit evidence

- exploit: https://hackmd.io/@haind-pwn/unarr-tar-zip-oob (CNA: VulnCheck)
- exploit: https://hackmd.io/@haind-pwn/unarr-tar-zip-oob (ADP: CISA-ADP)

## References

- https://github.com/selmf/unarr/security/advisories/GHSA-qm4g-jf39-jwjj (CNA: VulnCheck; vendor-advisory)

- https://github.com/selmf/unarr/releases/tag/v1.2.0 (CNA: VulnCheck; release-notes, patch)

- https://hackmd.io/@haind-pwn/unarr-tar-zip-oob (CNA: VulnCheck; technical-description, exploit)

- https://www.vulncheck.com/advisories/unarr-through-1.1.1-heap-out-of-bounds-read-via-zip-parse-extra-fields (CNA: VulnCheck; third-party-advisory)

- https://hackmd.io/@haind-pwn/unarr-tar-zip-oob (ADP: CISA-ADP; exploit)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-111274; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-111274; retrieved 2026-11-02; source updated Not reported

Revision: c8a9f32457188ecc85c20afab51f9d2fee8b4e2e1baa9fd2be6a2c00ec074b28

Canonical: https://y2.dev/cve/CVE-2026-111274