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Vulnerability record · CVE-2021-30246 · published 7 April 2021

CVE-2021-30246: Kjur jsrsasign improper verification of cryptographic signature vulnerability

Kjur · Jsrsasign

In the jsrsasign package through 10.1.13 for Node.js, some invalid RSA PKCS#1 v1.5 signatures are mistakenly recognized to be valid. NOTE: there is no known practical attack.

9.1 CVSS 3.1 Critical EPSS 0.96% · top 40.0% CWE-347 · Improper verification of cryptographic signature
9.1CVSS 3.1 base score, v2 6.4
0.96%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
22 Jun 2026Last modified by NVD

Description

In the jsrsasign package through 10.1.13 for Node.js, some invalid RSA PKCS#1 v1.5 signatures are mistakenly recognized to be valid. NOTE: there is no known practical attack.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/kjur/jsrsasign/issues/478 Third Party Advisory
https://github.com/kjur/jsrsasign/releases/tag/10.1.13 Release NotesThird Party Advisory
https://kjur.github.io/jsrsasign/ Release NotesThird Party Advisory
https://github.com/kjur/jsrsasign/issues/478 Third Party Advisory
https://github.com/kjur/jsrsasign/releases/tag/10.1.13 Release NotesThird Party Advisory
https://kjur.github.io/jsrsasign/ Release NotesThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-25898Kjur jsrsasign improper verification of cryptographic signature vulnerabilityThe package jsrsasign before 10.5.25 are vulnerable to Improper Verification of Cryptographic Signature when JWS or JWT signature with non Base64URL …EPSS 1.2%9.8CVE-2020-14967Kjur jsrsasign memory buffer overflow vulnerabilityAn issue was discovered in the jsrsasign package before 8.0.18 for Node.js. Its RSA PKCS1 v1.5 decryption implementation does not detect ciphertext m…EPSS 2.3%9.8CVE-2020-14968Kjur jsrsasign memory buffer overflow vulnerabilityAn issue was discovered in the jsrsasign package before 8.0.17 for Node.js. Its RSASSA-PSS (RSA-PSS) implementation does not detect signature manipul…EPSS 2.9%9.3CVE-2026-4599Kjur jsrsasign vulnerabilityVersions of the package jsrsasign from 7.0.0 and before 11.1.1 are vulnerable to Incomplete Comparison with Missing Factors via the getRandomBigInteg…EPSS 0.78%8.8CVE-2026-4601Kjur jsrsasign vulnerabilityVersions of the package jsrsasign before 11.1.1 are vulnerable to Missing Cryptographic Step via the KJUR.crypto.DSA.signWithMessageHash process in t…EPSS 0.47%8.1CVE-2026-4600Kjur jsrsasign improper verification of cryptographic signature vulnerabilityVersions of the package jsrsasign before 11.1.1 are vulnerable to Improper Verification of Cryptographic Signature via the DSA domain-parameter valid…EPSS 0.32%7.7CVE-2026-4602Kjur jsrsasign vulnerabilityVersions of the package jsrsasign before 11.1.1 are vulnerable to Incorrect Conversion between Numeric Types due to handling negative exponents in ex…EPSS 0.88%7.7CVE-2026-4598Kjur jsrsasign vulnerabilityVersions of the package jsrsasign before 11.1.1 are vulnerable to Infinite loop via the bnModInverse function in ext/jsbn2.js when the BigInteger.mod…EPSS 0.96%

Source: NIST National Vulnerability Database (record CVE-2021-30246), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.