A flaw was found in libsoup. When the permessage-deflate WebSocket extension compresses a very large outgoing message, truncated size calculations used for GByteArray growth could wrap, causing zlib to write past the allocated buffer and resulting in a heap buffer overflow.
https://bugzilla.redhat.com/show_bug.cgi?id=2543296
https://access.redhat.com/security/cve/CVE-2026-102560
https://access.redhat.com/errata/RHSA-2026:93583
https://access.redhat.com/errata/RHSA-2026:93447
https://access.redhat.com/errata/RHSA-2026:93446
https://access.redhat.com/errata/RHSA-2026:93445