CVE-2026-18238 — MEDIUM (5.0)

Vulnerability 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 Score

5.0

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality

LOW

Integrity

NONE

Availability

NONE

Related Weaknesses (CWE)

CWE-1288 CWE-126

References

https://github.com/the-tcpdump-group/libpcap/commit/b9590d482986d64673712460aae1

FAQ

What is CVE-2026-18238?

CVE-2026-18238 is a vulnerability with a CVSS score of 5.0 (MEDIUM). 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...

How severe is CVE-2026-18238?

CVE-2026-18238 has been rated MEDIUM with a CVSS base score of 5.0/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-18238?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.