---
id: "CVE-2026-123616"
page: "https://infrastack.ai/live/CVE-2026-123616"
kind: "vulnerability"
aliases: ["CVE-2026-123616"]
title: "imgproxy: crafted ICO file exhausts memory and crashes workers"
severity: "high"
cvss: 8.7
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["image-processing", "imgproxy", "runtime", "self-hosted"]
not_affected_if: ["version-4.0.16-or-later"]
published_at: "2026-11-08T02:16:57+00:00"
first_seen_at: "2026-11-08T02:21:14+00:00"
updated_at: "2026-11-08T02:22:42+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123616", "first_seen_at": "2026-11-08T02:21:14+00:00"}]
exploit_sources: []
---

# imgproxy: crafted ICO file exhausts memory and crashes workers

Link for people: https://infrastack.ai/live/CVE-2026-123616 (this .md is for agents)

imgproxy, an image processing server, fails to validate the data_size field in its ICO image loader. A crafted 23-byte ICO file declaring about 4GB of data can exhaust memory and crash worker processes.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the imgproxy version the server runs, for example with `imgproxy -v` or the container image tag.
- Confirm whether the instance accepts remote image URLs from outside your network.

## Fix

- imgproxy from `3.3.0` before `4.0.16`: move to `4.0.16` or later.

## Timeline

- 2026-11-08T02:21:14+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123616

## Documents

- [advisory] Maintainer's advisory: github.com https://github.com/imgproxy/imgproxy/security/advisories/GHSA-mmq5-xm89-9pfg
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/imgproxy-3.3.0-before-4.0.16-memory-exhaustion-dos-via-ico-loader

## From the sources

imgproxy from 3.3.0 before 4.0.16 contains an unbounded memory allocation vulnerability in the ICO loader that fails to validate the data_size field. Attackers can supply a crafted 23-byte ICO file declaring a ~4GB data_size to trigger memory exhaustion and worker crashes without authentication.

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_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_