Tcpdump Group libpcap up to 1.9.x/1.10.6 memory leak

Summaryinfo

A vulnerability was found in Tcpdump Group libpcap up to 1.9.x/1.10.6. It has been rated as critical. This affects an unknown part. Performing a manipulation results in memory leak. This vulnerability is reported as CVE-2026-18313. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as critical has been found in Tcpdump Group libpcap up to 1.9.x/1.10.6. This affects an unknown function. The manipulation with an unknown input leads to a memory leak vulnerability. CWE is classifying the issue as CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. This is going to have an impact on availability. The summary by CVE is:

rpcapd can allocate up to 65536 bytes per each RPCAP_MSG_UPDATEFILTER_REQ or RPCAP_MSG_STARTCAP_REQ message received from the client, but it never frees the memory, so it leaks memory even under normal use. A malicious client can cause the server to leak memory substantially faster.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-18313 since 07/29/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 343120 (Linux Distros Unpatched Vulnerability : CVE-2026-18313), 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 (343120) and EUVD (EUVD-2026-72020). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Packet Analyzer Software

Vendor

• Tcpdump Group

Name

• libpcap

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10.0
• 1.10.1
• 1.10.2
• 1.10.3
• 1.10.4
• 1.10.5
• 1.10.6

License

• open-source

CPE 2.3info

• 🔒
• 🔒
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CPE 2.2info

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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