Prototype pollution in canvg



| Updated: 2025-07-31
Risk High
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2025-25977
CWE-ID CWE-1321
Exploitation vector Network
Public exploit N/A
Vulnerable software
 canvg
Web applications / JS libraries

Vendor canvg

Security Bulletin

This security bulletin contains one high risk vulnerability.

1) Prototype pollution

EUVDB-ID: #VU108091

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2025-25977

CWE-ID: CWE-1321 - Improperly Controlled Modification of Object Prototype Attributes (\'Prototype Pollution\')

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary JavaScript code.

The vulnerability exists due to improper input validation. A remote attacker can execute arbitrary code via the Constructor of the class StyleElement.

Mitigation

Install update from vendor's website.

Vulnerable software versions

canvg: 4.0.2

CPE2.3 External links

https://github.com/canvg/canvg/issues/1749
https://github.com/canvg/canvg/issues/1749


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.



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