Vulnerability · Published Sep 5, 2026 · Assigned by Tcpdump
CVE-2026-6244division by zero in libpcap before 1.10.7
Medium 5.5
In plain English
A medium-severity security flaw in libpcap from The Tcpdump Group. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.1%top 95.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
libpcap BPF interpreter for the 'div #k' and 'mod #k' ALU instructions does not check whether the immediate value is zero. In particular uncommon use cases a crafted filter program can cause a division by zero.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.21 | libpcap | 1.10.7-r0 | ALPINE-CVE-2026-6244 |
| Alpine:v3.22 | libpcap | 1.10.7-r0 | ALPINE-CVE-2026-6244 |
| Alpine:v3.23 | libpcap | 1.10.7-r0 | ALPINE-CVE-2026-6244 |
| Alpine:v3.24 | libpcap | 1.10.7-r0 | ALPINE-CVE-2026-6244 |
| Debian:12 | libpcap | no fix listed | DEBIAN-CVE-2026-6244 |
| Debian:13 | libpcap | no fix listed | DEBIAN-CVE-2026-6244 |
| Debian:14 | libpcap | 1.10.7-1 | DEBIAN-CVE-2026-6244 |
| Ubuntu:22.04:LTS | libpcap | no fix listed | UBUNTU-CVE-2026-6244 |
| Ubuntu:24.04:LTS | libpcap | no fix listed | UBUNTU-CVE-2026-6244 |
| Ubuntu:26.04:LTS | libpcap | no fix listed | UBUNTU-CVE-2026-6244 |
| Ubuntu:26.10 | libpcap | no fix listed | UBUNTU-CVE-2026-6244 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| The Tcpdump Group | libpcap | 0 – before 1.10.7 |
Weakness: CWE-369 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H