Vulnerability · Published Apr 21, 2026 · Assigned by Go
CVE-2026-33813Panic when decoding large WEBP image on 32-bit platforms in golang.org/x/image
High 7.5
In plain English
A high-severity security flaw in golang.org/x/image/webp from golang.org/x/image. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.3%top 72.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Parsing a WEBP image with an invalid, large size panics on 32-bit platforms.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | rclone | 1.74.0-r0 | ALPINE-CVE-2026-33813 |
| Debian:12 | golang-golang-x-image | no fix listed | DEBIAN-CVE-2026-33813 |
| Debian:13 | golang-golang-x-image | no fix listed | DEBIAN-CVE-2026-33813 |
| Debian:14 | golang-golang-x-image | 0.39.0-1 | DEBIAN-CVE-2026-33813 |
| Go | golang.org/x/image | 0.42.0 | GO-2026-4961 |
| Ubuntu:22.04:LTS | golang-golang-x-image | no fix listed | UBUNTU-CVE-2026-33813 |
| Ubuntu:24.04:LTS | golang-golang-x-image | no fix listed | UBUNTU-CVE-2026-33813 |
| Ubuntu:25.10 | golang-golang-x-image | no fix listed | UBUNTU-CVE-2026-33813 |
| Ubuntu:26.04:LTS | golang-golang-x-image | no fix listed | UBUNTU-CVE-2026-33813 |
| Ubuntu:26.10 | golang-golang-x-image | no fix listed | UBUNTU-CVE-2026-33813 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| golang.org/x/image | golang.org/x/image/webp | 0 – before 0.42.0 |