Bug 2463950 (CVE-2026-1858)

Summary: CVE-2026-1858 wget2: wget2: Improper certificate validation allows server impersonation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in wget2. This vulnerability allows a remote attacker, who has compromised a server certificate, to reuse it for Transport Layer Security (TLS) server authentication, even if the certificate was issued for a different purpose. This improper validation enables the attacker to impersonate a legitimate server, potentially leading to the disclosure of sensitive information or the compromise of data integrity.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2464100, 2464101    
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Description OSIDB Bzimport 2026-04-29 21:01:26 UTC
wget2 accepts a server certificate with incorrect Key Usage (KU) or Extended Key Usage (EKU). If the attackers compromise a certificate (with the associated private key) issued for a different purpose, they may be able to reuse it for TLS server authentication.