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CVE-2026-12478 is an out-of-bounds read in libsoup WebSocket frame handling caused by an incomplete fix for CVE-2026-0716. The earlier integer-overflow guard was placed only in the masked-frame processing path, leaving unmasked server-to-client frames without equivalent protection. A malicious WebSocket server can send an unmasked frame declaring a payload length near UINT64_MAX to a vulnerable libsoup-based client configured with max_incoming_payload_size set to 0, triggering the out-of-bounds read.
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libsoup WebSocket client out-of-bounds read caused by an incomplete integer-overflow fix for unmasked server-to-client frames.
A vulnerability affecting Unity Linux systems, tracked as CVE-2026-12478. The provided CVSS v3.0 vector indicates network reachability, high attack complexity, no privileges or user interaction required, and low confidentiality and availability impact.
A specific vulnerability addressed by the Fedora 43 libsoup3 security advisory; no technical vulnerability details are provided in the content.
An out-of-bounds read vulnerability in libsoup's WebSocket frame handling. The prior CVE-2026-0716 fix guarded integer overflow only for masked frames, leaving clients vulnerable to malicious unmasked server-to-client frames with payload lengths near UINT64_MAX when max_incoming_payload_size is 0.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.