CVE-2026-4601

HIGH EPSS 12.1%
Published Mar 23, 20263mo ago · Modified Jun 22, 20261w ago
8.8 CVSS 4.0
High
Find Similar
Published Mar 23, 2026 3mo ago
Last Modified Jun 22, 2026 1w ago

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.

CVSS Details

Base Score
8.8
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:H/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
12.1% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-325

Affected Products 1

VendorProductVersionRange
kjurjsrsasign* <11.1.1

References 4

  • gist.github.com https://gist.github.com/Kr0emer/93789fe6efe5519db9692d4ad1dad586
    ExploitMitigationThird Party Advisory
  • github.com https://github.com/kjur/jsrsasign/commit/0710e392ec35de697ce11e4219c988ba2b5fe0eb
    Patch
  • github.com https://github.com/kjur/jsrsasign/pull/645
    Issue Tracking
  • security.snyk.io https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15370941
    Third Party Advisory

Remediation

  • github.com https://github.com/kjur/jsrsasign/commit/0710e392ec35de697ce11e4219c988ba2b5fe0eb
    Patch