CVE-2026-122130— CESNET ipfixcol2 2.3.0 before 2.9.0 Buffer Overflow via Forwarder Output Plugin

Quick assessment

Affected

CESNET ipfixcol2

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CESNET ipfixcol2 在 2.3.0 至 2.9.0 之前的版本中，其 Forwarder 输出插件存在整数溢出漏洞。该漏洞允许未认证的 IPFIX 导出器通过使 uint16_t 消息长度计数器发生回绕，从而引发堆缓冲区溢出。攻击者可以向通过 TCP 进行转发的采集器（collector）发送接近 65535 字节的数据集以及大型模板，导致采集器崩溃，并实现对攻击者可控地址的 2 字节写入。

CVSS 8.2 · High Updated Nov 05, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

CESNET ipfixcol2 2.3.0 before 2.9.0 Buffer Overflow via Forwarder Output Plugin

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

整数溢出或超界折返

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
CESNET	ipfixcol2	2.3.0 ~ 2.9.0	-

II. Public POCs for CVE-2026-122130

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-122130

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Other References for CVE-2026-122130 (5)

https://github.com/CESNET/ipfixcol2 product
https://github.com/CESNET/ipfixcol2/blob/v2.8.0/src/plugins/output/forwarder/src/Message.cpp#L134-L156 technical-description
https://github.com/CESNET/ipfixcol2/commit/ad206f6217257b06b139f1b2bce50d52f5bc6acb patch
https://github.com/CESNET/ipfixcol2/releases/tag/v2.9.0 release-notes
https://www.vulncheck.com/advisories/cesnet-ipfixcol2-2.3.0-before-2.9.0-buffer-overflow-via-forwarder-output-plugin third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-122130

Same Patch Batch · CESNET · 2026-11-04 · 3 CVEs total

CVE-2026-122127	7.5 HIGH	CESNET ipfixcol2 2.7.1 before 2.9.0 Heap Buffer Overflow via TCP LZ4 Decoder
CVE-2026-122129	5.3 MEDIUM	CESNET ipfixcol2 2.7.1 before 2.9.0 Memory Exhaustion via TCP LZ4 Decoder

IV. Related Vulnerabilities

Same product: ipfixcol2

Same vendor: CESNET

Same weakness: CWE-190