Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

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.

rpcapd 会为从客户端收到的每条 RPCAP_MSG_UPDATEFILTER_REQ 或 RPCAP_MSG_STARTCAP_REQ 消息分配最多 65536 字节的内存，但它从不释放这些内存，因此即使在正常使用情况下也会发生内存泄漏。恶意客户端可以导致服务器以显著更快的速度泄漏内存。

CVSS 4.3 · Medium

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
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-18313

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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

Affected Products

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

II. Public POCs for CVE-2026-18313

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-18313

请登录查看更多情报信息。

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-2026-6244 5.5 MEDIUM division by zero in libpcap before 1.10.7
CVE-2026-6554 5.5 MEDIUM infinte loop 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

No comments yet

Leave a comment