Medium · CVSS 5.5CVE-2026-31912

OOBR in libpcap before 1.10.7CVE-2026-31912

Answer in brief

CVE-2026-31912 records a Medium severity (CVSS 5.5) vulnerability in OOBR in libpcap before 1.10.7. The current sources do not mark it as known exploited. The current feed maps The Tcpdump Group/libpcap (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 5, 2026Updated Sep 8, 2026Source checked Oct 20, 2026First seen by HOL Sep 5, 2026Material review Sep 8, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.5
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps The Tcpdump Group/libpcap (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
The Tcpdump Group/libpcapgeneric	>=0 <1.10.7	1.10.7

Recommended response

Check inventory. Check lockfiles and deployed manifests for The Tcpdump Group/libpcap.
Review the reported fix. Source-reported solution: Upgrade to libpcap 1.10.7 and migrate from bpf_filter() to pcap_offline_filter().

Evidence timeline and material changes

Published upstream
Sep 5, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 5, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.