CVE-2023-46234: browserify-sign vulnerable via an upper bound check issue in `dsaVerify` that leads to a signature forgery attack

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-10-26 · updated 2026-06-17
Weakness: CWE-347

Description

browserify-sign is a package to duplicate the functionality of node's crypto public key functions, much of this is based on Fedor Indutny's work on indutny/tls.js. An upper bound check issue in `dsaVerify` function allows an attacker to construct signatures that can be successfully verified by any public key, thus leading to a signature forgery attack. All places in this project that involve DSA verification of user-input signatures will be affected by this vulnerability. This issue has been patched in version 4.2.2.

Affected products

browserify-sign: before 4.2.2 — fixed in 4.2.2
Debian Linux: 11.0, 12.0
Npm Browserify-Sign: from 2.6.0 before 4.2.2 — fixed in 4.2.2

How to fix

Upgrade to a fixed version: browserify-sign 4.2.2; Npm Browserify-Sign 4.2.2. Check the vendor advisory for mitigations.

References

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