Bug 2491859 (CVE-2026-57062)

Summary: CVE-2026-57062 GnuPG: Incorrect cryptographic message parsing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: gtanzill, jbuscemi, jmitchel, kshier, pbohmill, rhel-process-autobot, teagle, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw in GnuPG's gpgsm component improperly handles the Cryptographic Message Syntax (CMS) format for AES-GCM. By accepting an authentication tag length of 4 bytes instead of the required 12 bytes, this vulnerability allows for a low-impact data integrity issue where the cryptographic validity of messages could be compromised.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Embargoed:
Bug Depends On: 2492986, 2492985    
Bug Blocks:    

Description OSIDB Bzimport 2026-06-23 18:01:34 UTC
CMS (Cryptographic Message Syntax) parsing in gpgsm in GnuPG through 2.5.20 mishandles the CMS format for AES-GCM because aes-ICVlen is supposed to be 12 bytes but 4 bytes is accepted. NOTE: this is related to CVE-2026-34182.