CVE-2025-30258

Description

In GnuPG before 2.5.5, if a user chooses to import a certificate with certain crafted subkey data that lacks a valid backsig or that has incorrect usage flags, the user loses the ability to verify signatures made from certain other signing keys, aka a "verification DoS."

CVSS v3.1 Score

2.7

LOW

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

Weakness Type (CWE)

CWE-754 CWE-754

Affected Products

Vendor	Product	Versions
gnupg	gnupg	< 2.4.8
gnupg	gnupg	2.5.0 — 2.5.5

References

Advisories & Patches

https://lists.gnupg.org/pipermail/gnupg-announce/2025q1/000491.html

Exploits

https://dev.gnupg.org/T7527

Other References

https://dev.gnupg.org/rG48978ccb4e20866472ef18436a32744350a65158

Frequently Asked Questions

What is CVE-2025-30258? +

In GnuPG before 2.5.5, if a user chooses to import a certificate with certain crafted subkey data that lacks a valid backsig or that has incorrect usage flags, the user loses the ability to verify signatures made from certain other signing keys, aka a "verification DoS." It has a CVSS v3.1 base score of 2.7 (LOW).

How severe is CVE-2025-30258? +

CVE-2025-30258 has a CVSS v3.1 score of 2.7 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

What products are affected by CVE-2025-30258? +

CVE-2025-30258 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-2025-30258? +

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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