---
id: CVE-2026-115906
title: 'zip: AES Entry HMAC Authentication Bypass on Premature EOF'
summary: >-
  zip is a zip library for Rust that supports reading and writing simple ZIP
  files. From 0.6.0 until 9.0.0, the AES entry reader in src/aes.rs verifies its
  HMAC only when the attacker-controlled data counter reaches zero. If the
  underlying…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-354
  - CWE-1284
vendor: zip-rs
product: zip2
affected:
  - 'zip2 >= 0.6.0, < 9.0.0'
published: '2026-10-26'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T16:30:30.954Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115906'
references:
  - url: 'https://github.com/zip-rs/zip2/security/advisories/GHSA-8hxf-qr8p-62x4'
    label: 'https://github.com/zip-rs/zip2/security/advisories/GHSA-8hxf-qr8p-62x4'
  - url: >-
      https://github.com/zip-rs/zip2/commit/ec265db0b0602f8ffb9479327397bddefb7e2216
    label: >-
      https://github.com/zip-rs/zip2/commit/ec265db0b0602f8ffb9479327397bddefb7e2216
  - url: 'https://github.com/zip-rs/zip2/releases/tag/v9.0.0'
    label: 'https://github.com/zip-rs/zip2/releases/tag/v9.0.0'
tags:
  - cve.org
ingestedAt: '2026-10-26T17:33:33.082Z'
---

## Overview

zip is a zip library for Rust that supports reading and writing simple ZIP files. From 0.6.0 until 9.0.0, the AES entry reader in src/aes.rs verifies its HMAC only when the attacker-controlled data counter reaches zero. If the underlying bounded reader reaches the real end of the archive while data_remaining is still positive, or if an encrypted entry has no payload, the reader can return a clean end of stream without reading and comparing the authentication tag. Applications using by_index_decrypt, by_name_decrypt, by_path_decrypt, or password-enabled by_index_with_options can therefore accept modified plaintext without an authentication error. This issue is fixed in version 9.0.0.

## Affected

- `zip2 >= 0.6.0, < 9.0.0`

## Remediation

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