{"id":"CVE-2026-102559","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-102559","generatedAt":"2026-10-28T01:53:14.652Z","title":"When constructing a masked WebSocket client frame for a very large outgoing payload, size values passed to GByteArray allocation APIs could be truncated while the masking routine still used the full length, causing a heap buffer overflow.","description":"A flaw was found in libsoup. When constructing a masked WebSocket client frame for a very large outgoing payload, size values passed to GByteArray allocation APIs could be truncated while the masking routine still used the full length, causing a heap buffer overflow.","published":"2026-09-29T18:17:09.000Z","lastModified":"2026-10-19T05:17:04.000Z","status":"Modified","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"3.1","score":8.6,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"},"cwe":["CWE-125"],"affected":["gnome/libsoup","redhat/enterprise linux"],"epss":{"score":0.00404,"percentile":0.34368,"date":"2026-10-26","history":[{"date":"2026-09-30","score":0.003,"percentile":0.20448}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.40%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-29T18:17:09.000Z","detail":{"score":"8.6","severity":"HIGH","publishedAt":"2026-09-29T18:17:08.503Z"},"summary":"New CVE, high severity (CVSS 8.6)."}],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:83384","tags":["Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:83618","tags":["Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:84586","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-102559","tags":["Mitigation","Third Party Advisory"],"source":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2543285","tags":["Issue Tracking","Patch","Third Party Advisory"],"source":"secalert@redhat.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-102559","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}