Description
CESNET ipfixcol2 2.7.1 before 2.9.0 contains a heap-based buffer overflow in Lz4Decoder.cpp that allows unauthenticated network peers to write past heap buffers. Attackers can declare a small ring buffer_size followed by a large decompressed_size to write up to 65535 controlled bytes and crash the collector.
Published: 2026-11-04
Score: 8.7 High
EPSS: n/a
KEV: No
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History

Wed, 04 Nov 2026 20:45:00 +0000

Type Values Removed Values Added
Description CESNET ipfixcol2 2.7.1 before 2.9.0 contains a heap-based buffer overflow in Lz4Decoder.cpp that allows unauthenticated network peers to write past heap buffers. Attackers can declare a small ring buffer_size followed by a large decompressed_size to write up to 65535 controlled bytes and crash the collector.
Title CESNET ipfixcol2 2.7.1 before 2.9.0 Heap Buffer Overflow via TCP LZ4 Decoder
Weaknesses CWE-787
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Subscriptions

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-04T20:36:48.956Z

Reserved: 2026-11-04T18:13:09.783Z

Link: CVE-2026-122127

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-04T21:18:08.200

Modified: 2026-11-04T21:18:08.200

Link: CVE-2026-122127

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses