Package vulnerability, severity high

github.com/imgproxy/imgproxy/v3: imgproxy has out-of-bounds heap read/write in ICO loader BMP header reconstruction that allows unauthenticated remote worker c…

Published October 30, 2026, updated October 31, 2026

imgproxy has out-of-bounds heap read/write in ICO loader BMP header reconstruction that allows unauthenticated remote worker crash. Source: GHSA-494m-4556-wf5p.

What's affected

• github.com/imgproxy/imgproxy/v3 (go)>=3.3.0 <4.0.17

What to do

1. Upgrade github.com/imgproxy/imgproxy/v3 to 4.0.17 or later.

Check whether you were affected

Pharon tells teams automatically when this affects something they run. To check a machine, run this in Claude Code with the Pharon plugin, in the repository that uses it:

/pharon:check-incident ghsa-494m-4556-wf5p

References

• https://osv.dev/vulnerability/GHSA-494m-4556-wf5p
• https://github.com/imgproxy/imgproxy/security/advisories/GHSA-494m-4556-wf5p
• https://github.com/imgproxy/imgproxy/pull/1726
• https://github.com/imgproxy/imgproxy/commit/39fd9e844a8a46084161502e993d5a3c16ccf28d
• https://github.com/imgproxy/imgproxy
• https://github.com/imgproxy/imgproxy/releases/tag/v4.0.17

Notice ghsa-494m-4556-wf5p, signed with key feed-prod-2026-10 (Ed25519). The Pharon CLI verifies the signature before using a notice.