CVE-2020-14968 RSA-PSS signature validation vulnerability by prepending zeros in jsrsasign

What is CVE-2020-14968?

CVE-2020-14968 is a critical vulnerability in n/a, published on 22 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in the jsrsasign package before 8.0.17 for Node.js. Its RSASSA-PSS (RSA-PSS) implementation does not detect signature manipulation/modification by prepending '\0' bytes to a signature (it accepts these modified signatures as valid). An attacker can abuse this behavior in an application by creating multiple valid signatures where only one signature should exist. Also, an attacker might prepend these bytes with the goal of triggering memory corruption issues.

Weakness: CWE-119

Which versions are affected by CVE-2020-14968?

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

Products include Kjur Jsrsasign, Netapp Max Data.

How do I fix CVE-2020-14968?

Upgrade jsrsasign to 8.0.17 or later.

Is CVE-2020-14968 being exploited?

There is no known exploitation of CVE-2020-14968 in the wild and no public exploit code.

Other vulnerabilities in n/a

• CVE-2020-14967 RSA PKCS#1 decryption vulnerability with 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
• CVE-2021-30246 RSA signature validation vulnerability on maleable encoded message in jsrsasign Critical 9.1

Sources

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

Also known as GHSA-q3gh-5r98-j4h3.