---
id: CVE-2026-18313
title: >-
  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
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 …
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-401
  - CWE-772
vendor: The Tcpdump Group
product: libpcap
affected:
  - libpcap 1.9.x
  - libpcap >= 1.10.x < 1.10.7
published: '2026-09-05'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T19:20:25.117'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18313'
references:
  - url: >-
      https://github.com/the-tcpdump-group/libpcap/commit/f9775af1a0ec76db60c7213241e6b48f1be10ac7
    label: security@tcpdump.org
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-18313.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-18313'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2529092'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-18313'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18313'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00227
epssPercentile: 0.11965
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-08T15:16:35.323875Z'
ingestedAt: '2026-09-06T10:53:52.076Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-18313.json)