CESNET ipfixcol2 up to 2.8.x Forwarder output plugin integer overflow

Summaryinfo

A vulnerability was found in CESNET ipfixcol2 up to 2.8.x. It has been classified as critical. This affects an unknown function of the component Forwarder output plugin. The manipulation leads to integer overflow. This vulnerability is traded as CVE-2026-122130. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, has been found in CESNET ipfixcol2 up to 2.8.x. This issue affects an unknown code block of the component Forwarder output plugin. The manipulation with an unknown input leads to a integer overflow vulnerability. Using CWE to declare the problem leads to CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. Impacted is integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-122130 since 11/04/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 2.9.0 eliminates this vulnerability.

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Productinfo

Vendor

• CESNET

Name

• ipfixcol2

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8

Website

• Product: https://github.com/CESNET/ipfixcol2/

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