Bug 2439671 (CVE-2026-2443)

Summary: CVE-2026-2443 libsoup: Out-of-Bounds Read in libsoup handle_partial_get() Leading to Heap Information Disclosure
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: low    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was identified in libsoup, a widely used HTTP library in GNOME-based systems. When processing specially crafted HTTP Range headers, the library may improperly validate requested byte ranges. In certain build configurations, this could allow a remote attacker to access portions of server memory beyond the intended response. Exploitation requires a vulnerable configuration and access to a server using the embedded SoupServer component.
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Bug Depends On: 2439672, 2439673    
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Description OSIDB Bzimport 2026-02-13 11:36:27 UTC 
Out-of-bounds read vulnerability in the handle_partial_get() function of libsoup when processing HTTP Range headers. The issue occurs because the end value of the byte range is not properly validated against the total response size. If GLib is compiled with G_DISABLE_CHECKS, the call to g_bytes_new_from_bytes() may create a slice that exceeds the bounds of the original buffer. A specially crafted HTTP request with a large range value can cause heap memory beyond the intended response body to be returned to the attacker. This vulnerability can be triggered remotely without authentication or user interaction, potentially exposing portions of server heap memory.