CVE catalog

CVE-2026-31911

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.

[CVE catalog]

Severity: Medium · CVSS 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published: Sep 5, 2026, 6:50:03 PM UTC
Updated: Sep 5, 2026, 7:16:55 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.10% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	libpcap	sid	`1.11.0-1`	fixed
Debian	libpcap	forky	`1.11.0-1`	fixed
Debian	libpcap	trixie	`1.10.5-2`	vulnerable
Debian	libpcap	bookworm	`1.10.3-1`	vulnerable
Alpine	libpcap	3.21	`1.10.7-r0`	fixed
Alpine	libpcap	3.22	`1.10.7-r0`	fixed
Alpine	libpcap	3.23	`1.10.7-r0`	fixed
Alpine	libpcap	3.24	`1.10.7-r0`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	libpcap	source	sid	`1.10.7-1`	not yet assigned	Not reported	[1146825]
Debian	libpcap	source	forky	`1.10.7-1`	not yet assigned	Not reported	[1146825]
Debian	libpcap	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1146825]
Debian	libpcap	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1146825]
Alpine	libpcap	apk	3.21	`1.10.7-r0`	Not reported	ALPINE-CVE-2026-31911	Not reported
Alpine	libpcap	apk	3.22	`1.10.7-r0`	Not reported	ALPINE-CVE-2026-31911	Not reported
Alpine	libpcap	apk	3.23	`1.10.7-r0`	Not reported	ALPINE-CVE-2026-31911	Not reported
Alpine	libpcap	apk	3.24	`1.10.7-r0`	Not reported	ALPINE-CVE-2026-31911	Not reported

[Debian bug #1146825]

Notes

[trixie] libpcap: Minor issue [bookworm] libpcap: Minor issue, requires running a malicious BPF program

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libpcap0.8]Affected
Source package: [libpcap]
Details (2)
- 1.10.3-1 · amd64 · bookworm
  Affected
  nvd · libpcap · debian · bookworm; nvd · libpcap · debian · 12
- 1.10.3-1 · arm64 · bookworm
  Affected
  nvd · libpcap · debian · bookworm; nvd · libpcap · debian · 12
[libpcap0.8-dev]Affected
Source package: [libpcap]
Details (2)
- 1.10.3-1 · amd64 · bookworm
  Affected
  nvd · libpcap · debian · bookworm; nvd · libpcap · debian · 12
- 1.10.3-1 · arm64 · bookworm
  Affected
  nvd · libpcap · debian · bookworm; nvd · libpcap · debian · 12
[libpcap-dev]Affected
Source package: [libpcap]
Details (2)
- 1.10.3-1 · amd64 · bookworm
  Affected
  nvd · libpcap · debian · bookworm; nvd · libpcap · debian · 12
- 1.10.3-1 · arm64 · bookworm
  Affected
  nvd · libpcap · debian · bookworm; nvd · libpcap · debian · 12

[Debian 13 (Trixie)]

[libpcap0.8-dev]Affected
Source package: [libpcap]
Details (2)
- 1.10.5-2 · amd64 · trixie
  Affected
  nvd · libpcap · debian · 13
- 1.10.5-2 · arm64 · trixie
  Affected
  nvd · libpcap · debian · 13
[libpcap0.8t64]Affected
Source package: [libpcap]
Details (2)
- 1.10.5-2 · amd64 · trixie
  Affected
  nvd · libpcap · debian · 13
- 1.10.5-2 · arm64 · trixie
  Affected
  nvd · libpcap · debian · 13
[libpcap-dev]Affected
Source package: [libpcap]
Details (2)
- 1.10.5-2 · amd64 · trixie
  Affected
  nvd · libpcap · debian · 13
- 1.10.5-2 · arm64 · trixie
  Affected
  nvd · libpcap · debian · 13

Observed: Oct 23, 2026, 9:29:13 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]