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Vulnerability · Published Oct 26, 2026 · Assigned by GitHub_M

CVE-2026-115906zip: AES Entry HMAC Authentication Bypass on Premature EOF

Medium 6.5

In plain English

A medium-severity security flaw in zip2 from zip-rs. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 4% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.2%top 95.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12rust-zipno fix listedDEBIAN-CVE-2026-115906
Debian:13rust-zipno fix listedDEBIAN-CVE-2026-115906
Debian:14rust-zipno fix listedDEBIAN-CVE-2026-115906
Ubuntu:22.04:LTSrust-zipno fix listedUBUNTU-CVE-2026-115906
Ubuntu:24.04:LTSrust-zipno fix listedUBUNTU-CVE-2026-115906
Ubuntu:26.04:LTSrust-zipno fix listedUBUNTU-CVE-2026-115906
Ubuntu:26.10rust-zipno fix listedUBUNTU-CVE-2026-115906

Affected products (as reported)

VendorProductVersions
zip-rs zip2 >= 0.6.0, < 9.0.0

Weakness: CWE-354, CWE-1284 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

References