4.3

CVE-2026-18313: the tcpdump group libpcap

CVSS: 4.3v3.1MediumAwaiting analysis
AliasesUBUNTU-CVE-2026-18313DEBIAN-CVE-2026-18313
Published 05-09-2026Last modified 08-09-2026
Open JSON

Vulnerability summary

CVE-2026-18313 is a medium (CVSS 4.3) vulnerability in the tcpdump group libpcap. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 12.5% of scored vulnerabilities.

Overall risk
17/100
0100
Low · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.23%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 10 · Related 9
MGASA-2026-0416OPENSUSE-SU-2026:11744-1OPENSUSE-SU-2026:21940-1SUSE-SU-2026:23737-1SUSE-SU-2026:23829-1SUSE-SU-2026:23892-1

Timeline

  1. 05-09-2026
    PublishedVulnerability first disclosed.
  2. 08-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

13%

Versus all other CVEs

30-day change

+0.01 pp

From 0.21% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.23%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • libpcapAll versions (No fix recorded) | < 1.10.7-1
The tcpdump group1 product
  • libpcap≥ 1.9.0, < 1.10.0 | ≥ 1.10.x, < 1.10.7
Ubuntu1 product
  • libpcapAll versions (No fix recorded)

3 vendors · 3 products

References

5 links