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CVE-2020-14968

Critical · CVSS 9.8

jsrsasign — RSASSA-PSS signature manipulation / memory corruption (CWE-119)

CVSS
9.8
nvd
EPSS
KEV
No
Class
oss containerizable
CWE-119

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.

Search profile — drives PoC discovery

Symbols RSASSA-PSSRSA-PSSrsaVerifyByKeypssKJUR.crypto.Signatureprepend \0 bytessignatureHexverifyStringjsrsasign
Keywords CVE-2020-14968jsrsasignRSASSA-PSSRSA-PSSsignature bypassnull byte prependsignature manipulationjsrsasign 8.0.17kjurNode.js crypto signature
Versions: < 8.0.17

Ranked PoCs (17) — best first

Heuristic ranking — not yet expert-vetted. Scored on structure + provenance, not execution.

Recall-favoring discovery; ranking by the Stage-4 scorer (Adam's rubric). Scanner/aggregator repos are hidden.

Affected packages

npm jsrsasign 3.0.0 → 8.0.17

References

Status: enriched · ingested 2026-06-22T06:00:15.000Z · profiled 2026-06-22T06:30:15.000Z