CVE-2026-18238

Name	CVE-2026-18238
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1146825

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libpcap (PTS)	bookworm	1.10.3-1	vulnerable
	trixie	1.10.5-2	vulnerable
	forky, sid	1.10.7-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libpcap	source	(unstable)	1.10.7-1	unimportant		1146825

Notes

Fixed by: https://github.com/the-tcpdump-group/libpcap/commit/b9590d482986d64673712460aae1d48d11fa0473 (libpcap-1.10.7)
https://www.openwall.com/lists/oss-security/2026/09/09/2
Debian binary packages not built with experimental --enable-remote