Vulnerability in Red Hat Enterprise Linux 10

[ Why it matters ]Priority signals

• Critical severity: CVSS 9.8

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

• Patch on bugzilla.redhat.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ Advisories ]Government CERT advisories

• BSI CERT-Bund14 Oct 2026WID-SEC-2026-3952

  Red Hat Enterprise Linux (libsoup): Multiple vulnerabilities Translated from German

  Risk highCVE-2026-102558CVE-2026-102557CVE-2026-102560+2 more CVEs

[ References ]References

• access.redhat.com/errata/RHSA-2026:83384Third Party Advisory
• access.redhat.com/errata/RHSA-2026:83618Third Party Advisory
• access.redhat.com/security/cve/CVE-2026-102560MitigationThird Party Advisory
• bugzilla.redhat.com/show_bug.cgiIssue TrackingPatchThird Party Advisory