---
id: CVE-2026-111274
title: unarr through 1.1.1 Heap Out-of-Bounds Read via zip_parse_extra_fields
summary: >-
  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 an…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-125
vendor: selmf
product: unarr
affected:
  - unarr <= 1.1.1
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-23T19:58:38.162845Z'
exploitAvailable: true
published: '2026-10-15'
updated: '2026-11-02'
sourceUpdated: '2026-11-02T02:21:48.872Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111274'
references:
  - url: 'https://github.com/selmf/unarr/security/advisories/GHSA-qm4g-jf39-jwjj'
    label: GitHub Security Advisory (GHSA-qm4g-jf39-jwjj)
  - url: 'https://github.com/selmf/unarr/releases/tag/v1.2.0'
    label: Release Notes
  - url: 'https://hackmd.io/@haind-pwn/unarr-tar-zip-oob'
  - url: >-
      https://www.vulncheck.com/advisories/unarr-through-1.1.1-heap-out-of-bounds-read-via-zip-parse-extra-fields
    label: >-
      VulnCheck Advisory: unarr through 1.1.1 Heap Out-of-Bounds Read via
      zip_parse_extra_fields
  - url: >-
      https://github.com/selmf/unarr/blob/b211040df83dee513362cdeb9bd87afa26fd5e38/zip/parse-zip.c#L48-L72
  - url: 'https://github.com/selmf/unarr'
tags:
  - cve.org
  - exploit-available
epss: 0.00196
epssPercentile: 0.09389
ingestedAt: '2026-10-15T22:48:25.447Z'
---

## Overview

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.

## Affected

- `unarr <= 1.1.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.