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CVE-2026-18313

rpcapd memory leak in libpcap before 1.10.7

MEDIUM
4.3
CVSS Score
Published: September 5, 2026 at 06:51 PM UTC
Updated: September 8, 2026 at 07:39 PM UTC
1 product affected across 1 vendorLibpcap

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Libpcap· Tcpdump
60%
1.10.x ≤ v < 1.10.71.10.x1.9.x
Affected range stops below 1.10.7, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Patch
Source: cverecord
https://github.com/the-tcpdump-group/libpcap/commit/f9775af1a0ec76db60c7213241e6b48f1be10ac7

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMTcpdump
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-401

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