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CVE-2026-18238— OOBR in rpcap client 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 1.8.x版本、1.9.x版本和1.10.7版本之前的1.10.x版本存在安全漏洞，该漏洞源于rpcap客户端代码处理从服务器接收的RPCAP_MSG_PACKET消息时未正确验证标头，恶意服务器可发送特制消息，导致客户端将缓冲区末尾之外最多20字节的进程内存视为捕获数据包的一部分，从而造成信息泄露。

CVSS 5.0 · Medium EPSS 0.18% · P7

Affected Version Matrix 3

VendorProduct Version RangeStatus
The Tcpdump Group libpcap 1.8.x affected
1.9.x affected
1.10.x< 1.10.7 affected
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I. Basic Information for CVE-2026-18238

Vulnerability Information
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Vulnerability Title
OOBR in rpcap client in libpcap before 1.10.7
Source: CVE Program / CVE List V5
Vulnerability Description
The rpcap client code that processes a RPCAP_MSG_PACKET message received from the server incorrectly validates its headers. A malicious server can send a crafted message and cause the client to treat up to 20 bytes of the client process memory beyond the end of the buffer as if it was a part of the captured packet.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1288
Source: CVE Program / CVE List V5
Vulnerability Title
The Tcpdump Group LIBPCAP 缓冲区错误漏洞
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 1.8.x版本、1.9.x版本和1.10.7版本之前的1.10.x版本存在安全漏洞，该漏洞源于rpcap客户端代码处理从服务器接收的RPCAP_MSG_PACKET消息时未正确验证标头，恶意服务器可发送特制消息，导致客户端将缓冲区末尾之外最多20字节的进程内存视为捕获数据包的一部分，从而造成信息泄露。
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 1.8.x -

II. Public POCs for CVE-2026-18238

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III. Intelligence Information for CVE-2026-18238

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Patches & Fixes for CVE-2026-18238 (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-2026-18313 4.3 MEDIUM rpcapd memory leak in libpcap before 1.10.7

IV. Related Vulnerabilities

Same product: libpcap
Same vendor: The Tcpdump Group
Same weakness: CWE-1288

V. Comments for CVE-2026-18238

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