CVE-2026-46601 Panic on VP8 alpha channel size mismatch in x/image/webp in golang.org/x/image
A remote attacker can cause a denial of service by sending a crafted WebP image with mismatched VP8 alpha channel dimensions to applications using the Go image library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-46601?
CVE-2026-46601 is a high-severity denial of service vulnerability in golang.org/x/image/webp, published on 25 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The webp decoder can panic when processing a VP8 chunk with dimensions that do not match the canvas size.
Which versions are affected by CVE-2026-46601?
1 open source package ship an affected version, including golang.org/x/image.
| Package | Affected | Fixed in |
|---|---|---|
golang.org/x/image Go | All versions | 0.43.0 |
How do I fix CVE-2026-46601?
Upgrade golang.org/x/image to 0.43.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-46601 being exploited?
There is no known exploitation of CVE-2026-46601 in the wild and no public exploit code.
Sources
Also known as CLEANSTART-2026-BZ94585, CLEANSTART-2026-CU18243, DEBIAN-CVE-2026-46601, GHSA-m43h-mp45-ghq6, GO-2026-5061, MINI-365x-frv9-jg56 and 32 more.