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CVE-2026-31912— OOBR 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 1.10.7之前版本存在缓冲区错误漏洞，该漏洞源于BPF解释器未检测到过滤器程序缓冲区结束，也未检测到跳转偏移越界，特制的过滤器程序可能导致越界读取操作系统进程内存。

CVSS 5.5 · Medium EPSS 0.10% · P1

Possible ATT&CK Techniques 1 AI

T1202 · Indirect Command Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
The Tcpdump Group libpcap < 1.10.7 affected
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I. Basic Information for CVE-2026-31912

Vulnerability Information
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Vulnerability Title
OOBR in libpcap before 1.10.7
Source: CVE Program / CVE List V5
Vulnerability Description
libpcap BPF interpreter detects neither reaching the end of the filter program buffer due to lack of a return instruction nor executing a jump instruction with an offset that translates to a pointer outside of the buffer. In particular uncommon use cases a crafted filter program can cause the interpreter to try reading the OS process memory in the 32GiB around the buffer on 64-bit architectures and in the entire address space on 32-bit architectures.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1285
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 1.10.7之前版本存在缓冲区错误漏洞，该漏洞源于BPF解释器未检测到过滤器程序缓冲区结束，也未检测到跳转偏移越界，特制的过滤器程序可能导致越界读取操作系统进程内存。
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 0 ~ 1.10.7 -

II. Public POCs for CVE-2026-31912

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III. Intelligence Information for CVE-2026-31912

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Patches & Fixes for CVE-2026-31912 (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-2026-18238 5.0 MEDIUM OOBR in rpcap client 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-1285

V. Comments for CVE-2026-31912

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