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CVE-2026-18238

medium CVSS 5.0 EPSS 0.2%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-18238 applies to, and the release that fixes it where the sources name one.

libpcap 1.10.5 fixed in 1.10.7

At a glance

Severity
Medium
CVSS base score
5.0 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.2% probability of exploitation in the next 30 days, higher than 7% of scored vulnerabilities
Weakness
CWE-126
Published
2026-09-05
NVD CVE.org

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