Integer overflow in Cesnet Ipfixcol2
CVE-2026-122130
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 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.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/CESNET/ipfixcol2 (product)
- github.com/CESNET/ipfixcol2/blob/v2.8.0/src/plugins/output/forwarder/src/Messag… (technical-description)
- github.com/CESNET/ipfixcol2/commit/ad206f6217257b06b139f1b2bce50d52f5bc6acb (patch)
- github.com/CESNET/ipfixcol2/releases/tag/v2.9.0 (release-notes)
- www.vulncheck.com/advisories/cesnet-ipfixcol2-2.3.0-before-2.9.0-buffer-overflo… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-122130?
- CVE-2026-122130 is a high-severity vulnerability in Cesnet Ipfixcol2, classified under Integer Overflow or Wraparound. CVSS score: 8.2/10. Published 2026-11-04.
- How severe is CVE-2026-122130?
- High severity. CVSS v3 base score is 8.2 out of 10.