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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.

处理从服务器接收到的 消息的 RPCAP 客户端代码，在验证消息头部时存在缺陷。恶意服务器可以发送一个精心构造的消息，导致客户端将缓冲区末尾之外的多达 20 字节客户端进程内存误认为是捕获数据包的一部分。

CVSS 5.0 · Medium

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

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-2026-6244 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-2026-18313 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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