DescriptionA flaw was found in the way certificate signatures could be forged using collisions found in the SHA-1 algorithm. An attacker could use this weakness to create forged certificate signatures. This issue affects GnuPG versions before 2.2.18.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs945859

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
gnupg1 (PTS)buster1.4.23-1vulnerable
sid, trixie, bookworm, bullseye1.4.23-1.1vulnerable
gnupg2 (PTS)buster, buster (security)2.2.12-1+deb10u2vulnerable
bullseye (security), bullseye2.2.27-2+deb11u2fixed
sid, trixie, bookworm2.2.40-1.1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[buster] - gnupg2 <ignored> (Minor issue)
[stretch] - gnupg2 <no-dsa> (Minor issue)
[jessie] - gnupg2 <ignored> (No backport to version << 2.2.x, low impact, danger of breaking things)
[jessie] - gnupg <ignored> (No backport to version << 2.2.x, low impact, danger of breaking things);a=commit;h=c4f2d9e3e1d77d2f1f168764fcdfed32f7d1dfc4;a=commit;h=7d9aad63c4f1aefe97da61baf5acd96c12c0278e;a=commit;h=dd18be979e138dd3712315ee390463e8ee1fe8c1
Negligible security impact for gnupg1 which is only provided to decrypt legacy secrets

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