VDB-399352 · CVE-2026-6554 · EUVD-2026-72019

Tcpdump Group libpcap up to 1.10.6 BPF Interpreter infinite loop

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.3	$0-$5k	0.39

Summaryinfo

A vulnerability, which was classified as problematic, was found in Tcpdump Group libpcap up to 1.10.6. This affects an unknown function of the component BPF Interpreter. Executing a manipulation can lead to infinite loop. This vulnerability is tracked as CVE-2026-6554. The attack is restricted to local execution. No exploit exists.

Detailsinfo

A vulnerability has been found in Tcpdump Group libpcap up to 1.10.6 and classified as problematic. This vulnerability affects some unknown functionality of the component BPF Interpreter. The manipulation with an unknown input leads to a infinite loop vulnerability. The CWE definition for the vulnerability is CWE-835. The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. As an impact it is known to affect availability. CVE summarizes:

libpcap BPF interpreter treats the offset in the 'ja L' BPF instruction as a signed integer to implement looping via backward jumps, but it does not limit the number of loop iterations. In particular uncommon use cases a crafted filter program can cause the interpreter to loop infinitely.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-6554 since 04/18/2026. The exploitation appears to be easy. The attack needs to be approached locally. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 343121 (Linux Distros Unpatched Vulnerability : CVE-2026-6554), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.10.7 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (343121) and EUVD (EUVD-2026-72019). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Packet Analyzer Software

Vendor

Tcpdump Group

Name

libpcap

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.5
CNA Vector (Tcpdump): 🔒

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Infinite loop
CWE: CWE-835 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 343121
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-6554

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: libpcap 1.10.7

Timelineinfo

04/18/2026 CVE reserved
09/05/2026 +140 days Advisory disclosed
09/05/2026 +0 days VulDB entry created
09/06/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-6554 (🔒)
GCVE (CVE): GCVE-0-2026-6554
GCVE (VulDB): GCVE-100-399352
EUVD: 🔒

Entryinfo

Created: 09/05/2026 21:11
Updated: 09/06/2026 09:54
Changes: 09/05/2026 21:11 (65), 09/05/2026 22:36 (1), 09/06/2026 09:54 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.