Bug 2533313 (CVE-2026-85676)

Summary: CVE-2026-85676 Dub: Dub: Open Redirect Vulnerability via unrestricted redir_url parameter
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: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Dub. This open redirect vulnerability exists in the `redir_url` query parameter, which is accepted on every short link without validation or domain allowlist enforcement. A remote attacker can exploit this by appending the `redir_url` parameter to any short link. This allows the attacker to redirect visitors to arbitrary external URLs through the trusted Dub domain, bypassing destination blacklists and potentially enabling phishing attacks.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2533599, 2533600    
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Description OSIDB Bzimport 2026-09-14 19:43:06 UTC 
Dub contains an open redirect vulnerability in the redir_url query parameter that is accepted on every short link without validation or domain allowlist enforcement. Attackers can append the redir_url parameter to any short link to redirect visitors to arbitrary external URLs through the trusted Dub domain, bypassing destination blacklists and potentially enabling phishing attacks with link cloaking enabled.