CVE-2026-39823
Description
CVE-2026-27142 fixed a vulnerability in which URLs were not correctly escaped inside of a <meta> tag's <content> attribute. If the URL content were to insert ASCII whitespaces around the '=' rune inside of the <content> attribute, the escaper would fail to similarly escape it, leading to XSS.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2026-39823.html
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-39823
Vendor advisory: security@golang.org — https://pkg.go.dev/vuln/GO-2026-4982
Vendor advisory: security@golang.org — https://groups.google.com/g/golang-announce/c/qcCIEXso47M
Vendor advisory: security@golang.org — https://go.dev/cl/769920
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bullseye | affected | |
| debian | forky | fixed | 1.25.10-1 |
| debian | trixie | affected | |
| debian | bookworm | affected | |
| debian | sid | fixed | 1.25.10-1 |
| sles | affected | |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Go | stdlib | >=1.26.0-0,<1.26.3 | 1.25.10 |
References
CWEs
CWE-79
Verify integrity in audit chain (admin only). AS-IS.