{"id":"CVE-2026-102560","title":"A flaw was found in libsoup","summary":"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…","severity":"high","cvss":8.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H","cwe":["CWE-125"],"vendor":"Red Hat","product":"libsoup3","affected":["libsoup3 (all versions)","libsoup (all versions)","libsoup","libsoup (all versions)","libsoup (all versions)"],"published":"2026-09-29","updated":"2026-10-15","sourceUpdated":"2026-10-15T17:17:09.807","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-102560","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:83384","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:83618","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-102560","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2543296","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-102560.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-102560"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102560"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-29T19:51:42.455534Z"},"epss":0.00419,"epssPercentile":0.36034,"ingestedAt":"2026-09-29T17:41:02.260Z","slug":"CVE-2026-102560","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-29 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-102560.json)","depth":"twilight","depthScore":47,"depthScoreParts":{"impact":47.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}