CVE-2026-18238: CWE-1288: Improper Validation of Consistency within Input in The Tcpdump Group libpcap
The rpcap client code that processes a RPCAP_MSG_PACKET message received from the server incorrectly validates its headers. A malicious server can send a crafted message and cause the client to treat up to 20 bytes of the client process memory beyond the end of the buffer as if it was a part of the captured packet.
CVE-2026-18238: CWE-1288: Improper Validation of Consistency within Input in The Tcpdump Group libpcap
Description
The rpcap client code that processes a RPCAP_MSG_PACKET message received from the server incorrectly validates its headers. A malicious server can send a crafted message and cause the client to treat up to 20 bytes of the client process memory beyond the end of the buffer as if it was a part of the captured packet.
CVSS v3.1
Score 5.0medium
Affected software
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Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Tcpdump
- Date Reserved
- 2026-07-29T13:32:44.322Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a9c688aacd9273b49460eb8
Added to database: 09/05/2026, 19:07:54 UTC
Last updated: 09/05/2026, 21:52:34 UTC
Views: 7
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