CVE-2026-18313

rpcapd memory leak in libpcap before 1.10.7

CVE-2026-18313 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

4.3

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0023

13th percentile

rpcapd can allocate up to 65536 bytes per each RPCAP_MSG_UPDATEFILTER_REQ or RPCAP_MSG_STARTCAP_REQ message received from the client, but it never frees the memory, so it leaks memory even under normal use. A malicious client can cause the server to leak memory substantially faster.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
libpcap · Debian 14	1.10.7-1	DEBIAN-CVE-2026-18313	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
Missing Release of Memory after Effective Lifetime
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-18313

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