UBUNTU-CVE-2026-122129

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Source
https://ubuntu.com/security/CVE-2026-122129
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-122129.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-122129
Upstream
Published
2026-11-05T00:00:00Z
Modified
2026-11-06T01:00:41Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • 6.9 (Medium) CVSS_V4 - 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 CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:26.10 / ipfixcol2

Package

Name
ipfixcol2
Purl
pkg:deb/ubuntu/ipfixcol2?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.8.0+20260519-1
2.8.0+20260519-2
2.8.0+20260701-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ipfixcol2",
            "binary_version": "2.8.0+20260701-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-122129.json"