Is CVE-2026-122130 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-122130 being exploited in the wild.

How severe is CVE-2026-122130?

High severity, with a CVSS score of 8.2, published 4 November 2026.

Which products and versions are affected?

CESNET Ipfixcol2 2.3.0 before 2.9.0.

Is there a fix for CVE-2026-122130?

Yes: fixed in 2.9.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-122130 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-122130?

Check whether you run CESNET Ipfixcol2 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-122130: CESNET ipfixcol2 integer overflow in Forwarder plugin

CVE-2026-122130 · Severity: high · CVSS 8.2 · Published 2026-11-04

CESNET ipfixcol2 is a high-performance NetFlow and IPFIX flow data collector used to aggregate network traffic information. An integer overflow vulnerability in the Forwarder output plugin allows unauthenticated remote attackers to crash the collector and potentially write arbitrary data to memory by sending specially crafted IPFIX messages with oversized data sets and templates.

Technologies: CESNET Ipfixcol2. Vendors: CESNET.

Quick answers

Is CVE-2026-122130 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-122130 being exploited in the wild.
How severe is CVE-2026-122130?: High severity, with a CVSS score of 8.2, published 4 November 2026.
Which products and versions are affected?: CESNET Ipfixcol2 2.3.0 before 2.9.0.
Is there a fix for CVE-2026-122130?: Yes: fixed in 2.9.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-122130 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-122130?: Check whether you run CESNET Ipfixcol2 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 2.9.0

Technical details

The vulnerability is an integer overflow in uint16_t message length counters within the Forwarder output plugin's message handling code (Message.cpp). Unauthenticated IPFIX exporters can trigger a heap buffer overflow by sending near-65535-byte data sets and large templates over TCP, causing the length field to wrap around. This allows 2-byte writes to attacker-influenced memory addresses.

Affected products

CESNET ipfixcol2 2.3.0 before 2.9.0

Timeline

2026-11-04: disclosed

References

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