is_js vulnerable to Regular Expression Denial of Service

Description

is.js is a general-purpose check library. Versions 0.9.0 and prior contain one or more regular expressions that are vulnerable to Regular Expression Denial of Service (ReDoS). is.js uses a regex copy-pasted from a gist to validate URLs. Trying to validate a malicious string can cause the regex to loop “forever.

Recommendation

No fix is available yet. Followings are affected versions:

• <= 0.9.0

References

• GHSA-pvrw-g6fx-mcx2
• CVE-2020-26302
• CWE-1333
• CWE-400
• CAPEC-310
• OWASP 2021-A6

Related Issues

• undici Denial of Service attack via bad certificate data - CVE-2025-47279
• Marvin Attack of RSA and RSAOAEP decryption in jsrsasign - CVE-2024-21484
• Inefficient Regular Expression Complexity in validator.js - CVE-2021-3765
• Feathers socket handler allows abusing implicit toString - CVE-2023-37899

Tags:

npm

is_js