CVE-2026-33813 Panic when decoding large WEBP image on 32-bit platforms in golang.org/x/image
An attacker can cause a denial of service by providing a malformed WEBP image to applications using the Go image library on 32-bit platforms.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-33813?
CVE-2026-33813 is a high-severity denial of service vulnerability in golang.org/x/image/webp, published on 21 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Parsing a WEBP image with an invalid, large size panics on 32-bit platforms.
Which versions are affected by CVE-2026-33813?
1 open source package ship an affected version, including golang.org/x/image. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
golang.org/x/image Go | All versions | 0.42.0 |
Products include Golang Image.
How do I fix CVE-2026-33813?
Upgrade golang.org/x/image to 0.42.0 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-2026-33813 being exploited?
There is no known exploitation of CVE-2026-33813 in the wild and no public exploit code.
Other vulnerabilities in golang.org/x/image/webp
Sources
Also known as CLEANSTART-2026-CD57070, CLEANSTART-2026-HU95465, DEBIAN-CVE-2026-33813, GO-2026-4961, MINI-45jh-24p6-pv8p, MINI-4c2f-r7cp-pw32 and 27 more.