CVE-2026-39823: CVE-2026-27142 fixed a vulnerability
Source GCVE Database
Mentioned vulnerabilities
Not known to be exploited · CVSS 6.1 Medium : upgrade to 1.26.3 or 1.25.10 when convenient.
Data as of 27 Oct 2026, 00:07 UTC
- Patch
- Available – fixed in 1.26.3, 1.25.10
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 7 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade html/template to 1.26.3 or 1.25.10.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Go standard libraryhtml/template | Affected
| Fixed in
|
| Go standard libraryhtml/template | Affected
| Fixed in
|
Gohtml/templatepkg:golang/html/templateOther threats | Affected
| Fixed in
|
Gogithub.com/golang/go/html/templatepkg:golang/github.com/golang/go/html/templateOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
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.