Vulnerability · Published Sep 5, 2026 · Assigned by Tcpdump
CVE-2026-18313rpcapd memory leak in libpcap before 1.10.7
Medium 4.3
In plain English
A medium-severity memory leak in libpcap from The Tcpdump Group. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.2%top 86.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libpcap | no fix listed | DEBIAN-CVE-2026-18313 |
| Debian:13 | libpcap | no fix listed | DEBIAN-CVE-2026-18313 |
| Debian:14 | libpcap | 1.10.7-1 | DEBIAN-CVE-2026-18313 |
| Ubuntu:22.04:LTS | libpcap | no fix listed | UBUNTU-CVE-2026-18313 |
| Ubuntu:24.04:LTS | libpcap | no fix listed | UBUNTU-CVE-2026-18313 |
| Ubuntu:26.04:LTS | libpcap | no fix listed | UBUNTU-CVE-2026-18313 |
| Ubuntu:26.10 | libpcap | no fix listed | UBUNTU-CVE-2026-18313 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| The Tcpdump Group | libpcap | 1.9.x1.10.x – before 1.10.7 |
Weakness: CWE-401 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L