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Fencer Intel
medium 4.3

CVE-2026-18313 json

rpcapd memory leak in libpcap before 1.10.7

published 2mo ago modified 2mo ago also EUVD-2026-72020

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits
0
none known

Summary

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.

Patch / fix

  • The Tcpdump Group libpcap 1.10.7
  • libpcap Debian 14 1.10.7-1

debian advisories DEBIAN-CVE-2026-18313

  • libpcap SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.10.5-160000.5.1
  • libpcap SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +8 more 1.10.1-150400.3.12.1
  • libpcap SLE Module for Package Hub 15 SP7, SLE Module for Basesystem 15 SP7 1.10.5-150700.3.13.1
  • libpcap Linux Micro 6.1 1.10.4-slfo.1.1_3.1
  • libpcap Linux Micro 6.0 1.10.4-5.1
  • libpcap SLES for SAP 15 SP6, SLES 15 SP6-LTSS 1.10.4-150600.3.12.1

suse advisories SUSE-SU-2026:23892-1SUSE-SU-2026:23907-1SUSE-SU-2026:4195-1SUSE-SU-2026:4194-1SUSE-SU-2026:4188-1SUSE-SU-2026:23737-1

  • libpcap openSUSE Leap 16.0 1.10.5-160000.5.1
  • libpcap openSUSE Tumbleweed 1.10.7-1.1

opensuse advisories openSUSE-SU-2026:21940-1openSUSE-SU-2026:11744-1

  • libpcap Azure Linux 3.0 1.10.7-1

azure linux advisories AZL-99735

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Is CVE-2026-18313 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-18313 updated cvss 4.3

libpcap: libpcap: Denial of Service via memory leak in rpcapd

  • Red Hat Enterprise Linux 6 libpcap Red Hat Enterprise Linux 7 libpcap Red Hat Enterprise Linux 8 libpcap Red Hat Enterprise Linux 9 libpcap Red Hat Enterprise Linux 10 libpcap Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    +1 more products
    Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2mo ago

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Affected products

  • The Tcpdump Group libpcap

Classification

Weakness
  • CWE-401 Missing Release of Memory after Effective Lifetime

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.