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CVE-2026-119600

tcpflow through 1.6.1 Out-of-Bounds Read via TCP Demultiplexer Payload Length

6.3 Medium

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 profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
Low

Exploit likelihood

0.37%Unchanged since Oct 31, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.3

tcpflow through 1.6.1 Out-of-Bounds Read via TCP Demultiplexer Payload Length

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.

Record
CVE-2026-119600
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness
CWE-130
Updated
2026-11-02
EUVDEUVD-2026-113937 6.3

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.

Record
EUVD-2026-113937
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-rjcg-fcj6-3hq4 6.3

tcpflow through 1.6.1 contains an out-of-bounds read vulnerability that allows unauthenticated...

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.

Record
GHSA-rjcg-fcj6-3hq4
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/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
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness
CWE-130
Updated
2026-11-02
NVD 6.3

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.

Record
CVE-2026-119600
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/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
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Weakness
CWE-130
Updated
2026-11-02
OSV 6.3

tcpflow through 1.6.1 Out-of-Bounds Read via TCP Demultiplexer Payload Length

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.

Record
CVE-2026-119600
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-130
Updated
2026-11-02
OSVDEBIAN-CVE-2026-119600 4.8

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.

Record
DEBIAN-CVE-2026-119600
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Updated
2026-11-02
OSVUBUNTU-CVE-2026-119600 6.3

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.

Record
UBUNTU-CVE-2026-119600
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Updated
2026-11-04

Affected products

Affected packages

Affected packages
PackageAffectedFixed
tcpflow
Debian:12
 All versions, plus listed versions
1.6.1-21.6.1-3
 None known
tcpflow
Debian:13
 All versions, plus listed versions
1.6.1-3
 None known
tcpflow
Debian:14
 All versions, plus listed versions
1.6.1-3
 None known
tcpflow
Ubuntu:Pro:14.04:LTS
 All versions, plus listed versions
1.3.0+dfsg-21.4.3+repack1-11.4.4+repack1-11.4.4+repack1-21.4.4+repack1-2ubuntu0.1~esm1
 None known
tcpflow
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.4.4+repack1-31.4.5+repack1-11.4.5+repack1-1ubuntu0.1
 None known
tcpflow
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.4.5+repack1-41.4.5+repack1-4build11.4.5+repack1-4build21.4.5+repack1-4ubuntu0.18.04.1
 None known
tcpflow
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.5.2+repack1-1build11.5.2+repack1-1build2
 None known
tcpflow
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.6.1-11.6.1-21.6.1-2build1
 None known
tcpflow
Ubuntu:24.04:LTS
 All versions, plus listed versions
1.6.1-31.6.1-3build11.6.1-3build2
 None known
tcpflow
Ubuntu:26.10
 All versions, plus listed versions
1.6.1-3build31.6.1-3build4
 None known
tcpflow
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.6.1-3build21.6.1-3build3
 None known

History

History
RecordedChangedSources
affected, aliases, facts, referencesOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-119600 is a medium vulnerability (CVSS 6.3) in Simsong Tcpflow, published October 30, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.37%, the 31st percentile. No source names a fixed version.

References

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