CVSS 4.0
2.0 lowCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:PCVE-2026-4603
Low (2.0) in kjur jsrsasign. EPSS 0.1% chance of exploitation in the next 30 days. Fixed in jsrsasign 11.1.1.
Versions of the package jsrsasign before 11.1.1 are vulnerable to Division by zero due to the RSASetPublic/KEYUTIL parsing path in ext/rsa.js and the BigInteger.modPowInt reduction logic in ext/jsbn.js. An attacker can force RSA public-key operations (e.g., verify and encryption) to collapse to deterministic zero outputs and hide “invalid key” errors by supplying a JWK whose modulus decodes to zero.
Severity
CVSS 3.1
5.3 mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L- EPSS
- 0.1% chance of exploitation in the next 30 days; higher than 0% of CVEs (scores of 2026-10-31)
- CWE
- CWE-369
- Published
- Modified
- Record from
- the NVD, synced
Affected
- kjur:jsrsasign
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-464q-cqxq-xhgr | npm | jsrsasign | <11.1.1 | 11.1.1 |