Bug 2560301 (CVE-2026-115557)

Summary: CVE-2026-115557 python: Distrust compromised eMudhra intermediate certificates in Python ssl module
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: bbrownin, cahl, dfreiber, dkeler, drow, dschmidt, gbenhaim, ikhan, jburrell, jlanda, kshier, ljawale, msilmser, niyer, rbobbitt, rhel-process-autobot, simaishi, stcannon, suppawar, thason, twaugh, vkumar, watson-tool-maintainers, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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The eMudha certificate authority issues a set of intermediate CA certificates with weak private keys. A man-in-the-middle attacker could use these weak intermediate CA certificates to issue certificates for arbitrary host names and have them accepted by TLS/SSL clients as valid if those clients trusted root certificate authorities which signed these weak intermediate CA certificates. The Python ssl module was modified to reject these weak intermediate CA certificates regardless of whether issues root CAs are trusted.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2567235, 2567237, 2567241, 2567242, 2567244, 2567245, 2567246, 2567247, 2567248, 2567236, 2567238, 2567240, 2567243    
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Description OSIDB Bzimport 2026-10-24 14:31:20 UTC 
Python has added a denylist for known compromised certificates to the "ssl" module to ensure user safety even without certificate revocation configured. Known compromised certificates will automatically be rejected regardless of the SSLContext policy configuration.