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CVE-2026-31911— abort() in libpcap before 1.10.7 on an invalid BPF opcode

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.

当 libpcap 的 BPF 解释器遇到带有无效操作码（opcode）的 BPF 指令时，会调用 。在特定不常见的用例中，一个精心构造的过滤程序可能导致宿主操作系统的进程终止。

CVSS 5.5 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
The Tcpdump Group libpcap < 1.10.7 affected
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I. Basic Information for CVE-2026-31911

Vulnerability Information
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Vulnerability Title
abort() in libpcap before 1.10.7 on an invalid BPF opcode
Source: CVE Program / CVE List V5
Vulnerability Description
libpcap BPF interpreter calls abort() if it encounters a BPF instruction that has an invalid opcode. In particular uncommon use cases a crafted filter program can terminate the OS process.
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
可达断言
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
The Tcpdump Group libpcap 0 ~ 1.10.7 -

II. Public POCs for CVE-2026-31911

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III. Intelligence Information for CVE-2026-31911

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Patches & Fixes for CVE-2026-31911 (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-2026-31912 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
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-617

V. Comments for CVE-2026-31911

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