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The integrity check feature in OpenPGP, when handling a message that was encrypted using cipher feedback (CFB) mode, allows remote attackers to recover part of the plaintext via a chosen-ciphertext attack when the first 2 bytes of a message block are known, and an oracle or other mechanism is available to determine whether an integrity check failed.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Freebsd | — | Upgrade pgpUpgrade p5-Crypt-OpenPGPUpgrade gnupg | Dec 10, 2025 | Jul 31, 2005 |
| Gentoo Linux | — | Upgrade app-crypt/gnupg. | Oct 30, 2017 | May 2, 2005 |
| Suse | — | Upgrade gpg | Feb 17, 2015 | May 2, 2005 |
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