Bug 2558650 (CVE-2026-114717)

Summary: CVE-2026-114717 roundcubemail: roundcubemail: Mail header injection via forwarded message subject
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 roundcubemail. When forwarding an email as an attachment, the application uses the original message's subject line directly to construct the attachment name without properly sanitizing line breaks. A remote attacker can exploit this vulnerability by sending an email containing crafted carriage return and line feed (CRLF) characters in the subject line, allowing them to inject arbitrary Multipurpose Internet Mail Extensions (MIME) headers into outgoing forwarded messages.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2562374, 2562377    
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Description OSIDB Bzimport 2026-10-22 01:42:46 UTC 
Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a mail header injection vulnerability when a message is forwarded as an attachment. The subject of the forwarded message was used verbatim to generate the attachment name, so a received message whose subject contains CRLF sequences could inject arbitrary MIME part headers into the outgoing message. Upstream fixed this in the commit “Fix mail header injection via subject of a message forwarded as attachment”, which collapses whitespace in the generated name.