CVE-2022-25898 Improper Verification of Cryptographic Signature

What is CVE-2022-25898?

CVE-2022-25898 is a high-severity vulnerability in jsrsasign, published on 1 Jul 2022. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

The package jsrsasign before 10.5.25 are vulnerable to Improper Verification of Cryptographic Signature when JWS or JWT signature with non Base64URL encoding special characters or number escaped characters may be validated as valid by mistake. Workaround: Validate JWS or JWT signature if it has Base64URL and dot safe string before executing JWS.verify() or JWS.verifyJWT() method.

Weakness: CWE-347

Which versions are affected by CVE-2022-25898?

2 open source packages ship an affected version, including jsrsasign. It affects 1 product.

Products include Kjur Jsrsasign.

How do I fix CVE-2022-25898?

Upgrade jsrsasign to 10.5.25 or later.

Is CVE-2022-25898 being exploited?

There is no known exploitation of CVE-2022-25898 in the wild and no public exploit code.

Other vulnerabilities in jsrsasign

• CVE-2020-14967 RSA PKCS#1 decryption vulnerability with prepending zeros in jsrsasign Critical 9.8
• CVE-2020-14968 RSA-PSS signature validation vulnerability by prepending zeros in jsrsasign Critical 9.8
• CVE-2026-4601 jsrsasign: Missing cryptographic validation during DSA signing enables private key extraction Critical 9.4
• CVE-2026-4599 jsrsasign: Incomplete Comparison Allows DSA Private Key Recovery via Biased Nonce Generation Critical 9.3
• CVE-2026-4600 jsrsasign: DSA signatures or X.509 certificates can be forged via DSA domain-parameter validation in KJUR.crypto.DSA.setPublic Critical 9.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-3fvg-4v2m-98jf.