CVE-2026-115907

zip: legacy Shrink/Reduce/Implode decoder: denial of service from attacker-controlled ZIP64 uncompressed size

zip is a zip library for Rust that supports reading and writing simple ZIP files. From 5.1.0 until 9.0.0, applications built with the legacy-zip feature can reserve output capacity from an attacker-controlled ZIP64 uncompressed size before validating the compressed stream. The ShrinkDecoder path in src/legacy/shrink.rs can panic with a capacity overflow during ZipArchive::extract, and the Reduce and Implode decoders contain the same unbounded preallocation pattern. An unhandled panic can terminate an archive-processing service. This issue is fixed in version 9.0.0.

Affected

zip-rs · zip2

CVSS v3.1 GITHUB

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.35% chance of exploitation in the next 30 days, 29th percentile

Published

2026-10-26

Proof-of-concept exploits (1)

• advisories/GHSA-9hj8-73fh-9963find archive

CVE references

• zip-rs/zip2/commit/8b4991288b79ad11cce201c2d785d5baa795bd3eREFERENCE
• zip-rs/zip2/pull/991REFERENCE
• zip-rs/zip2/releases/tag/v9.0.0REFERENCE
• zip-rs/zip2/security/advisories/GHSA-9hj8-73fh-9963REFERENCE

References

• CVE Record
• NVD entry