Bug 2433463 (CVE-2026-24883)

Summary: CVE-2026-24883 GnuPG: GnuPG: Denial of service due to specially crafted signature packet
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: crizzo, gtanzill, jbuscemi, jjelen, jmitchel, kshier, pbohmill, teagle
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in GnuPG. A remote attacker could provide a specially crafted long signature packet that, when processed, causes the application to crash. This vulnerability leads to a denial of service (DoS), making the GnuPG application unavailable to legitimate users.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2433667, 2433668, 2433671, 2433682    
Bug Blocks:    

Description OSIDB Bzimport 2026-01-27 19:01:17 UTC 
In GnuPG before 2.5.17, a long signature packet length causes parse_signature to return success with sig->data[] set to a NULL value, leading to a denial of service (application crash).
Comment 2 Jakub Jelen 2026-01-28 16:46:56 UTC 
This does not affect any RHEL nor Fedora versions. This bug was introduced in https://dev.gnupg.org/rG36dbca3e6944d13e75e96eace634e58a7d7e201d which is only in the GnuPG 2.5.x versions per https://dev.gnupg.org/T8049

Please, adjust accordingly. I will close the Fedora trackers.