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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."

🗓️ 04 Sep 2025 03:09:31Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 1 Views

GnuPG before 2.5.5 may cause verification denial of service via crafted subkeys missing backsig or incorrect usage flags.

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04 Sep 2025 03:09Current
7High risk
Vulners AI Score7
CVSS 3.12.7 - 4.7
EPSS0.00052
SSVC
1