Improper input validation in Go HTML

1) Input validation error

EUVDB-ID: #VU107889

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2025-22872

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform code injection attacks.

The vulnerability exists due to insufficient validation of tags with unquoted attribute values that end with a solidus character (/). The tokenizer can interpret such tags as self-closing, leading to content following such tags as being placed in the wrong scope during DOM construction.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

html: 0.1.0 - 0.37.0

CPE2.3

• cpe:2.3:a:google:html:0.1.0:*:*:*:*:golang:*:*
• cpe:2.3:a:google:html:0.2.0:*:*:*:*:golang:*:*
• cpe:2.3:a:google:html:0.3.0:*:*:*:*:golang:*:*

External links

https://go.dev/cl/662715
https://go.dev/issue/73070
https://groups.google.com/g/golang-announce/c/ezSKR9vqbqA
https://pkg.go.dev/vuln/GO-2025-3595

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.