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Vulnerability · Published Mar 23, 2026 · Assigned by snyk

CVE-2026-4601

High 8.7

In plain English

A high-severity security flaw in jsrsasign. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.7High
Exploit odds (30 days)0.3%top 76.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Versions of the package jsrsasign before 11.1.1 are vulnerable to Missing Cryptographic Step via the KJUR.crypto.DSA.signWithMessageHash process in the DSA signing implementation. An attacker can recover the private key by forcing r or s to be zero, so the library emits an invalid signature without retrying, and then solves for x from the resulting signature.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npmjsrsasign11.1.1GHSA-w8q8-93cx-6h7r

Affected products (as reported)

VendorProductVersions
n/a jsrsasign 0 – before 11.1.1
n/a org.webjars.npm:jsrsasign 0 – before *

Weakness: CWE-325 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N/E:P

References