Medium severity5.3NVD Advisory· Published Nov 4, 2026
CVE-2026-122129
CVE-2026-122129
Description
CESNET ipfixcol2 2.7.1 before 2.9.0 contains a memory allocation vulnerability in Lz4Decoder::read_start_header() that allows unauthenticated attackers to exhaust memory by declaring unbounded ring buffer sizes. Attackers can open TCP connections sending LZ4 start headers with very large buffer sizes, forcing up to 4 GiB allocations per connection and denying collector service.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
1Patches
Vulnerability mechanics
References
4- github.com/CESNET/ipfixcol2/blob/v2.8.0/src/plugins/input/tcp/src/Lz4Decoder.cppnvd
- github.com/CESNET/ipfixcol2/commit/1a199033eff847941353c5c039cb806a9ad8aa6fnvd
- github.com/CESNET/ipfixcol2/releases/tag/v2.9.0nvd
- www.vulncheck.com/advisories/cesnet-ipfixcol2-2.7.1-before-2.9.0-memory-exhaustion-via-tcp-lz4-decodernvd
News mentions
0No linked articles in our index yet.