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CVE-2026-18313— rpcapd memory leak in libpcap before 1.10.7

Quick assessment

Affected
The Tcpdump Group libpcap
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

The Tcpdump Group LIBPCAP是The Tcpdump Group组织的一个网络数据包捕获函数库。 The Tcpdump Group LIBPCAP 1.9.x版本和1.10.7版本之前的1.10.x版本存在资源管理错误漏洞，该漏洞源于rpcapd在处理客户端消息时分配内存后未释放，导致内存泄漏，恶意客户端可导致服务器内存泄漏速度大幅加快。

CVSS 4.3 · Medium EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1024.001

Affected Version Matrix 2

VendorProduct Version RangeStatus
The Tcpdump Group libpcap 1.9.x affected
1.10.x< 1.10.7 affected
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I. Basic Information for CVE-2026-18313

Vulnerability Information
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Vulnerability Title
rpcapd memory leak in libpcap before 1.10.7
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5
Vulnerability Title
The Tcpdump Group LIBPCAP 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
The Tcpdump Group LIBPCAP是The Tcpdump Group组织的一个网络数据包捕获函数库。 The Tcpdump Group LIBPCAP 1.9.x版本和1.10.7版本之前的1.10.x版本存在资源管理错误漏洞，该漏洞源于rpcapd在处理客户端消息时分配内存后未释放，导致内存泄漏，恶意客户端可导致服务器内存泄漏速度大幅加快。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
The Tcpdump Group libpcap 1.9.x -

II. Public POCs for CVE-2026-18313

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III. Intelligence Information for CVE-2026-18313

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Patches & Fixes for CVE-2026-18313 (1)

Same Patch Batch · The Tcpdump Group · 2026-09-05 · 7 CVEs total

CVE-2026-0799 8.7 HIGH OOBR and OOBW in libpcap before 1.10.7
CVE-2026-6554 7.5 HIGH infinte loop in libpcap before 1.10.7
CVE-2026-6244 5.5 MEDIUM division by zero in libpcap before 1.10.7
CVE-2026-31911 5.5 MEDIUM abort() in libpcap before 1.10.7 on an invalid BPF opcode
CVE-2026-31912 5.5 MEDIUM OOBR in libpcap before 1.10.7
CVE-2026-18238 5.0 MEDIUM OOBR in rpcap client in libpcap before 1.10.7

IV. Related Vulnerabilities

Same product: libpcap
Same vendor: The Tcpdump Group
Same weakness: CWE-401

V. Comments for CVE-2026-18313

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