Dashboard / CVE-2026-122129

CVE-2026-122129

MEDIUM
MEDIUM Priority: 0.03 BB Relevance: 74/100
Published: 2026-11-04 Modified: 2026-11-12 First seen: 2026-11-04 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: X
AT: None
VC: None
VI: None
VA: Low

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.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
CESNET ipfixcol2 2.7.1 < 2.9.0
CESNET ipfixcol2 2.7.1 < 2.9.0

References & Advisories (5)

Bug Bounty Relevance

74 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

6.9 / 10.0 v4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS — Exploitation Probability

0.40%
Raw Score 0.004010
Percentile 34.9%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00401
2026-11-12
0.00401
2026-11-10
0.00401
2026-11-09
0.00401
2026-11-08
0.00401
2026-11-07
0.00401
2026-11-06
0.00401
2026-11-05
0.00401

Intelligence Sources

mitre ref →
nvd ref →

External Links