CVE-2026-33328: Possible integer overflow on 32-bit systems when reading GIF images

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-20 · updated 2026-08-19
Weakness: CWE-190

Description

libvips is a fast image processing library with low memory needs. On 32-bit systems in versions before and including 8.18.0, the `gifload` operation could incorrectly determine dimensions leading to an integer overflow. This has been patched in version 8.18.1.

Affected products

libvips: before 8.18.1 — fixed in 8.18.1

How to fix

Upgrade to a fixed version: libvips 8.18.1. Check the vendor advisory for mitigations.

References

https://github.com/libvips/libvips/commit/9b633e45abfcf1fc4c84847007c81805193c0969
https://github.com/libvips/libvips/pull/4935
https://github.com/libvips/libvips/security/advisories/GHSA-r98w-4fp7-m9c7

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