Vulnary
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Critical· 9.3official fix available

CVE-2026-4599

A critical flaw in the jsrsasign library allows attackers to recover private keys by exploiting a bug in random number generation used for DSA signatures. The flaw exists in versions 7.0.0 through 11.1.0. Upgrading to 11.1.1 or later removes the vulnerability.

publishedMar 23, 2026
last modifiedJul 20, 2026
sourcesNVD
severity · cvss
9.3
critical · how bad it is
exploitation · epss
<1%
39th percentile · chance of exploitation in 30 days
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →
auto-deletes from the system
counting…on Aug 19, 2026

An official fix is available, so this entry is kept for 30 days and then removed automatically.

01

Who is affected

The JavaScript library jsrsasign, versions 7.0.0 to 11.1.0, used in web applications and other software that rely on DSA signatures.

02

Real-world impact

An attacker could recover the private key used for DSA signatures, enabling them to forge signatures and impersonate legitimate users or tamper with signed data.

03

Why this severity

The CVSS score of 9.3 reflects the high impact of a private key compromise (high confidentiality and integrity impact) combined with low attack complexity and no user interaction required.

04

What to do about it

official fix available
recommended steps
  1. 01Upgrade jsrsasign to version 11.1.1 or later.
  2. 02Restart any services or applications that use the library.

NVD-referenced vendor advisory

05

Timeline

  1. Mar 23, 2026 · Mar 23, 2026
    Published
    Disclosed and added to the National Vulnerability Database.
  2. Jul 20, 2026 · 16d ago
    Advisory updated
    The NVD record was last revised.
  3. Jul 20, 2026 · 16d ago
    Official fix available
    A vendor patch or mitigation now exists — see the remediation steps above.
06

How it’s attacked

Attack vectorNetwork (remote)
Attack complexityLow
Attack requirementsNone
Privileges requiredNone
User interactionNone needed
Confidentiality impactHigh
Integrity impactHigh
Availability impactNone
07

References & advisories

NVD advisory ↗Search advisories ↗
(ai-assisted) A model wrote this summary from the official data, so double-check it against the source before you act on it. Read the official advisory →