{"id":"CVE-2026-122130","title":"CESNET ipfixcol2 2.3.0 before 2.9.0 Buffer Overflow via Forwarder Output Plugin","summary":"CESNET ipfixcol2 2.3.0 before 2.9.0 contains an integer overflow vulnerability in the Forwarder output plugin that allows unauthenticated IPFIX exporters to overflow a heap buffer by wrapping uint16_t message length counters. Attackers c…","severity":"high","cvss":8.2,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","cvssSource":"cna","cwe":["CWE-190"],"vendor":"CESNET","product":"ipfixcol2","affected":["ipfixcol2 >= 2.3.0 < 2.9.0"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-11-05T19:37:16.685325Z"},"published":"2026-11-04","updated":"2026-11-05","sourceUpdated":"2026-11-05T19:39:01.965Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-122130","references":[{"url":"https://github.com/CESNET/ipfixcol2/commit/ad206f6217257b06b139f1b2bce50d52f5bc6acb","label":"Patch Commit"},{"url":"https://github.com/CESNET/ipfixcol2"},{"url":"https://github.com/CESNET/ipfixcol2/releases/tag/v2.9.0","label":"ipfixcol2 v2.9.0 Release Notes"},{"url":"https://github.com/CESNET/ipfixcol2/blob/v2.8.0/src/plugins/output/forwarder/src/Message.cpp#L134-L156"},{"url":"https://www.vulncheck.com/advisories/cesnet-ipfixcol2-2.3.0-before-2.9.0-buffer-overflow-via-forwarder-output-plugin","label":"VulnCheck Advisory: CESNET ipfixcol2 2.3.0 before 2.9.0 Buffer Overflow via Forwarder Output Plugin"}],"tags":["cve.org"],"epss":0.00318,"epssPercentile":0.24867,"ingestedAt":"2026-11-05T22:38:31.554Z","slug":"CVE-2026-122130","body":"## Overview\n\nCESNET ipfixcol2 2.3.0 before 2.9.0 contains an integer overflow vulnerability in the Forwarder output plugin that allows unauthenticated IPFIX exporters to overflow a heap buffer by wrapping uint16_t message length counters. Attackers can send near-65535-byte data sets and large templates to a collector forwarding over TCP to crash it and perform 2-byte writes to attacker-influenced addresses.\n\n## Affected\n\n- `ipfixcol2 >= 2.3.0 < 2.9.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":45.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}