rpcapd memory leak in libpcap before 1.10.7

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-18313
StatePUBLISHED
AssignerTcpdump
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-05 19:16:55 UTC
Updated2026-09-05 19:16:55 UTC
Descriptionrpcapd 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.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Problem Types: CWE-401 | CWE-401 CWE-401 Missing Release of Memory after Effective Lifetime

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
3.1CNACVSS4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA The Tcpdump Group Libpcap affected 1.9.x Not specified
CNA The Tcpdump Group Libpcap affected 1.10.x 1.10.7 semver Not specified

References

ReferenceSourceLinkTags
github.com/the-tcpdump-group/libpcap/commit/f9775af1a0ec76db60c7213241e6... [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to libpcap 1.10.7.

Exploits

CNA: A functional exploit exists.

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