Vulnerability · Published Apr 21, 2026 · Assigned by Go
CVE-2026-33812Excessive memory allocation when decoding malicious SFNT in golang.org/x/image
Medium 6.1
In plain English
A medium-severity security flaw in golang.org/x/image/font/sfnt 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 0.1% (higher than 1% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.1%top 98.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Parsing a malicious font file can cause excessive memory allocation.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | golang-golang-x-image | no fix listed | DEBIAN-CVE-2026-33812 |
| Debian:13 | golang-golang-x-image | no fix listed | DEBIAN-CVE-2026-33812 |
| Debian:14 | golang-golang-x-image | 0.39.0-1 | DEBIAN-CVE-2026-33812 |
| Go | golang.org/x/image | 0.39.0 | GO-2026-4962 |
| Ubuntu:22.04:LTS | golang-golang-x-image | no fix listed | UBUNTU-CVE-2026-33812 |
| Ubuntu:24.04:LTS | golang-golang-x-image | no fix listed | UBUNTU-CVE-2026-33812 |
| Ubuntu:25.10 | golang-golang-x-image | no fix listed | UBUNTU-CVE-2026-33812 |
| Ubuntu:26.04:LTS | golang-golang-x-image | no fix listed | UBUNTU-CVE-2026-33812 |
| Ubuntu:26.10 | golang-golang-x-image | no fix listed | UBUNTU-CVE-2026-33812 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| golang.org/x/image | golang.org/x/image/font/sfnt | 0 – before 0.39.0 |