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Advisory record · GHSA-mmq5-xm89-9pfg

imgproxy has unbounded memory allocation in ICO loader that allows unauthenticated memory-exhaustion DoS via crafted data_size field

CVSS 7.5 High

Published by the GitHub Advisory Database at 30 Oct 2026, 22:55 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/imgproxy/imgproxy/v3Go>=3.3.0, <4.0.164.0.16
Identifiers
GHSA-mmq5-xm89-9pfg · GO-2026-6898
Weakness (CWE)
CWE-400
Tags
Published
30 Oct 2026
Updated
5 Nov 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

GHSA-mmq5-xm89-9pfg: imgproxy versions 3.3.0 up to 4.0.16 (fixed in 4.0.16) have an unbounded memory allocation in the ICO image loader, where an attacker-controlled size field is used for allocation without any bounds check. An unauthenticated attacker who gets a crafted ICO file processed by imgproxy can trigger a roughly 4GB allocation per request, causing memory exhaustion or crashes. Upgrade to imgproxy 4.0.16 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 14:11 UTC First seen by agentprime
  2. 31 Oct 2026, 14:11 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.