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🛡️ CVE-2026-4601 — jsrsasign

🟠 CVSS 8.0 — High ⚠️ Exploit Public CWE-325 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

jsrsasign: Missing cryptographic validation during DSA signing enables private key extraction

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. Rated impact: confidentiality high, integrity high, availability none.

CVSS metrics in full

The score comes from this vector: 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

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
  • Attack requirements: None — no deployment-specific condition has to hold.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: None.

Weakness class

CVE-2026-4601 is classified as CWE-325: Missing Cryptographic Step. A required step of a cryptographic algorithm is skipped, weakening the guarantees it should provide.

Affected software

CVE-2026-4601 is recorded against 1 package.

  • jsrsasign

Timeline and source

Published on 23 March 2026 and last revised on 17 August 2026. A public exploit is known to exist, which raises the urgency of patching considerably. A vendor advisory or fix has been published. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
gist.github.com (Web)
github.com (Package)
security.snyk.io (Web)

Other advisories for this package

jsrsasign has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-325: Missing Cryptographic Step) in other software:

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector 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
CWE CWE-325
Public Exploit ⚠️ Yes
Source OSV
Published 2026-03-23
Updated 2026-08-20
Modified 2026-08-17

Affected Packages

Software From version Fixed in
jsrsasign — —

Similar Threats

Exploit Protection

Are you running jsrsasign?

CVE-2026-4601 carries CVSS 8.0 High rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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