Home/CVE/Versions of the package jsrsasign before 11.1.1 are vulnerable to Incorrect Conversion between Numeric Types due to hand
CVE

CVE-2026-4602

Versions of the package jsrsasign before 11.1.1 are vulnerable to Incorrect Conversion between Numeric Types due to hand

Versions of the package jsrsasign before 11.1.1 are vulnerable to Incorrect Conversion between Numeric Types due to handling negative exponents in ext/jsbn2.js. An attacker can force the computation of incorrect modular inverses and break signature verification by calling modPow with a negative exponent.

HIGH · CVSS 7.5 EPSS 0.00078
Act now
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-681Incorrect Conversion between Numeric Types
▤

Affected Products & Versions

1
jsrsasign project jsrsasign< 11.1.1
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
npm jsrsasign HIGH fixed in 11.1.1
⚠

Public Exploits & PoCs

1
pocgist.github.com · 7ecd2be7d17419e4677315ef3758faf5gist.github.com
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · report@snyk.io
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD23 Mar 2026 · 06:16 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

7
rhsaRHSA-2026:19375Important
rhsaRHSA-2026:19410Important
rhsaRHSA-2026:19409Important
rhsaRHSA-2026:6926Important
rhsaRHSA-2026:6912Important
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/kjur/jsrsasign/commit/5ea1c32bb2aa894b4bd29849839afe4f98728195Patch
https://github.com/kjur/jsrsasign/pull/650Issue Tracking
https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371175Third Party Advisory
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