CVE-2025-68972: gnupg Signature Bypass (CVSS 5.9)

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.

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CVSS v3.1 Score

5.9

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N

Weakness Type (CWE)

CWE-347 CWE-347

Affected Products

Vendor	Product	Versions
gnupg	gnupg	< 2.4.8

References

Other References

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

Frequently Asked Questions

What is 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 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. It has a CVSS v3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2025-68972? +

CVE-2025-68972 has a CVSS v3.1 score of 5.9 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-68972? +

CVE-2025-68972 affects products from gnupg, specifically: gnupg. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-68972? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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