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Description

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.

PUBLISHED Reserved 2026-03-22 | Published 2026-03-23 | Updated 2026-03-23 | Assigner snyk




MEDIUM: 5.1CVSS: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:P
MEDIUM: 5.9CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P

Problem types

Division by zero

Credits

Kr0emer

References

security.snyk.io/vuln/SNYK-JS-JSRSASIGN-15371176

gist.github.com/Kr0emer/5366b7364c4fbf7e754bc377f321e9f3

github.com/...ommit/dc41d49fac4297e7a737a3ef8ebd0aa9c49ef93f

github.com/kjur/jsrsasign/pull/649

cve.org (CVE-2026-4603)

nvd.nist.gov (CVE-2026-4603)

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