Bug 2558745 (CVE-2026-114730)

Summary:	CVE-2026-114730 roundcubemail: roundcubemail: Server-Side Request Forgery via address filter bypass
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in Roundcube Webmail. The application's internal URL validation mechanism fails to properly block certain IPv6 address representations, including transition prefixes and unspecified addresses. A remote attacker can exploit this flaw by submitting a crafted URL to bypass Server-Side Request Forgery (SSRF) protections. This allows the server to make unauthorized requests to internal loopback, link-local, or cloud metadata endpoints, potentially leading to sensitive information disclosure.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2558789, 2558790
Bug Blocks:

Description OSIDB Bzimport 2026-10-22 02:42:29 UTC

Roundcube Webmail 1.6.14 before 1.6.20 and 1.7.0 before 1.7.5 is affected by a server-side request forgery filter bypass. The network blocklist used by rcube_utils::is_local_url() omitted the RFC 6052 NAT64 prefix 64:ff9b::/96, the RFC 8215 local-use NAT64 prefix 64:ff9b:1::/48 and the unspecified address ::/128, so URLs such as http://[64:ff9b::7f00:1]/ passed the filter and reached loopback, link-local and cloud metadata addresses. Upstream fixed this in the commit “Fix SSRF filter (is_local_url()) bypass via NAT64 64:ff9b::/96”.