CVE-2026-18238

OOBR in rpcap client in libpcap before 1.10.7

CVE-2026-18238 is fixed in 4 products on 1 platform, first by FEDORA-2026-4401B94AD0, released September 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

5.0

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0018

7th percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
libpcap · Debian 14	1.10.7-1	DEBIAN-CVE-2026-18238	Sep 14, 2026
libpcap · Fedora 43	14:1.10.7-1.fc43	FEDORA-2026-4401B94AD0	Sep 10, 2026
libpcap · opensuse-leap 16.0	1.10.5-160000.5.1	OPENSUSE-SU-2026:21940-1	Sep 23, 2026
libpcap · sles 15.6	1.10.4-150600.3.12.1	SUSE-SU-2026:4194-1	Sep 15, 2026
libpcap · sles 15.7	1.10.5-150700.3.13.1	SUSE-SU-2026:4188-1	Sep 15, 2026
libpcap · sles 16.0	1.10.5-160000.5.1	SUSE-SU-2026:23907-1	Sep 23, 2026
libpcap-debuginfo · Fedora 43	14:1.10.7-1.fc43	FEDORA-2026-4401B94AD0	Sep 10, 2026
libpcap-debugsource · Fedora 43	14:1.10.7-1.fc43	FEDORA-2026-4401B94AD0	Sep 10, 2026
libpcap-devel · Fedora 43	14:1.10.7-1.fc43	FEDORA-2026-4401B94AD0	Sep 10, 2026

Details

Published
September 5, 2026
Weakness
Improper Validation of Consistency within Input
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-18238

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