tcpflow through 1.6.1 contains an out-of-bounds read vulnerability that allows unauthenticated attackers to read process memory by sending packets with forged IP payload lengths. Attackers can inject crafted IPv4 or IPv6 TCP packets into captured traffic or pcap files to leak adjacent memory into reconstructed flow files or crash tcpflow.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
simsong tcpflow unaffected
Version Status Constraints
0 affected ≤ 1.6.1

No data.

No data.

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Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/simsong/tcpflow cve-icon cve-icon
https://github.com/simsong/tcpflow/blob/tcpflow-1.6.1/src/tcpdemux.cpp#L747 cve-icon cve-icon
https://github.com/simsong/tcpflow/blob/tcpflow-1.6.1/src/tcpdemux.cpp#L781 cve-icon cve-icon
https://github.com/simsong/tcpflow/issues/279 cve-icon cve-icon
https://hackmd.io/@haindpwn/tcpflow-ip-payload-length-oob-read cve-icon cve-icon
https://www.vulncheck.com/advisories/tcpflow-through-1.6.1-out-of-bounds-read-via-tcp-demultiplexer-payload-length cve-icon cve-icon
History

Fri, 30 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
Description tcpflow through 1.6.1 contains an out-of-bounds read vulnerability that allows unauthenticated attackers to read process memory by sending packets with forged IP payload lengths. Attackers can inject crafted IPv4 or IPv6 TCP packets into captured traffic or pcap files to leak adjacent memory into reconstructed flow files or crash tcpflow.
Title tcpflow through 1.6.1 Out-of-Bounds Read via TCP Demultiplexer Payload Length
Weaknesses CWE-130
References
Metrics cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L'}

cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-30T13:18:19.167Z

Reserved: 2026-10-30T11:46:46.502Z

Link: CVE-2026-119600

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-30T14:16:48.333

Modified: 2026-10-30T14:16:48.333

Link: CVE-2026-119600

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-30T14:45:14Z

Weaknesses