Bug 2426409 (CVE-2025-15079)

Summary: CVE-2025-15079 curl: Host verification bypass during SSH transfers
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: adudiak, crizzo, csutherl, dbosanac, gtanzill, jbuscemi, jcantril, jclere, jmitchel, jreimann, kshier, mdessi, mrizzi, pbohmill, pcattana, pjindal, plodge, rojacob, sdawley, security-response-team, stcannon, szappis, teagle, vchlup, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in curl. When performing SSH-based transfers using SCP or SFTP, libcurl could mistakenly connect to hosts not listed in the user-specified knownhosts file. This occurs if the host is present in the libssh global knownhosts file, effectively bypassing the intended host verification. This could allow a remote attacker to connect to an untrusted host, potentially leading to information disclosure or man-in-the-middle attacks.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Deadline: 2026-01-07   

Description OSIDB Bzimport 2025-12-31 04:09:20 UTC 
When doing SSH-based transfers using either SCP or SFTP, and setting the
knownhosts file, libcurl could still mistakenly accept connecting to hosts
*not present* in the specified file if they were added as recognized in the
libssh *global* knownhosts file.