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VulnerabilityPublished

CVE-2026-39823: CVE-2026-27142 fixed a vulnerability

Source GCVE Database

0

Mentioned vulnerabilities

Authoritative record:CVE-2026-39823· Medium 6.1

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

CVSS 3.1 base score
6.1Medium
How severe the flaw is on the 0–10 CVSS scale.
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:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 7 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
Go standard libraryhtml/templateAffected
  • >=1.26.0-0 <1.26.3
Fixed in
  • 1.26.3
Go standard libraryhtml/templateAffected
  • <1.25.10
Fixed in
  • 1.25.10
Gohtml/templatepkg:golang/html/templateOther threatsAffected
  • <1.25.10
  • >=1.26.0-0 <1.26.3
Fixed in
  • 1.25.10
  • 1.26.3
Gogithub.com/golang/go/html/templatepkg:golang/github.com/golang/go/html/templateOther threatsAffected
  • =0
  • =1.26.0-0
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.

References

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