CVE catalog
CVE-2026-6554
libpcap BPF interpreter treats the offset in the 'ja L' BPF instruction as a signed integer to implement looping via backward jumps, but it does not limit the number of loop iterations. A crafted fil
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.44% · Oct 25, 2026
libpcap BPF interpreter treats the offset in the 'ja L' BPF instruction as a signed integer to implement looping via backward jumps, but it does not limit the number of loop iterations. A crafted filter program or the 'protochain' primitive used on a crafted network packet can cause the interpreter to loop infinitely.
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 |
| Ubuntu | libpcap | pro | 1.9.1-2 | vulnerable |
| Ubuntu | libpcap | pro | 1.9.1-3 | vulnerable |
| Ubuntu | libpcap | pro | 1.9.1-3ubuntu1.20.04.1 | vulnerable |
| Ubuntu | libpcap | pro | 1.9.1-3ubuntu1.20.04.1+esm1 | vulnerable |
| Ubuntu | libpcap | 22.04 | 1.10.0-2build1 | vulnerable |
| Ubuntu | libpcap | 22.04 | 1.10.1-4 | vulnerable |
| Ubuntu | libpcap | 22.04 | 1.10.1-4build1 | vulnerable |
| Ubuntu | libpcap | 22.04 | 1.10.1-4ubuntu1.22.04.1 | vulnerable |
| Ubuntu | libpcap | 22.04 | 1.10.1-4ubuntu1.22.04.2 | vulnerable |
| Ubuntu | libpcap | 24.04 | 1.10.4-4 | vulnerable |
| Ubuntu | libpcap | 24.04 | 1.10.4-4ubuntu3 | vulnerable |
| Ubuntu | libpcap | 24.04 | 1.10.4-4.1ubuntu2 | vulnerable |
| Ubuntu | libpcap | 24.04 | 1.10.4-4.1ubuntu3 | vulnerable |
| Ubuntu | libpcap | 24.04 | 1.10.4-4.1ubuntu3.1 | vulnerable |
| Ubuntu | libpcap | 26.10 | 1.10.6-1ubuntu1 | vulnerable |
| Ubuntu | libpcap | 26.10 | 1.10.6-2ubuntu1 | vulnerable |
| Ubuntu | libpcap | 26.10 | 1.10.7-1ubuntu1 | vulnerable |
| Ubuntu | libpcap | 26.04 | 1.10.5-2ubuntu2 | vulnerable |
| Ubuntu | libpcap | 26.04 | 1.10.5-2ubuntu3 | vulnerable |
| Ubuntu | libpcap | 26.04 | 1.10.6-1ubuntu1 | vulnerable |
| Ubuntu | libpcap | 26.04 | 1.10.6-1ubuntu1.1 | vulnerable |
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-2026-6554 | Not reported |
| Alpine | libpcap | apk | 3.22 | 1.10.7-r0 | Not reported | ALPINE-CVE-2026-6554 | Not reported |
| Alpine | libpcap | apk | 3.23 | 1.10.7-r0 | Not reported | ALPINE-CVE-2026-6554 | Not reported |
| Alpine | libpcap | apk | 3.24 | 1.10.7-r0 | Not reported | ALPINE-CVE-2026-6554 | Not reported |
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 · bookwormAffected
nvd · libpcap · debian · bookworm; nvd · libpcap · debian · 12
1.10.3-1· arm64 · bookwormAffected
nvd · libpcap · debian · bookworm; nvd · libpcap · debian · 12
- [libpcap0.8-dev]Affected
Source package: [libpcap]
Details (2)
1.10.3-1· amd64 · bookwormAffected
nvd · libpcap · debian · bookworm; nvd · libpcap · debian · 12
1.10.3-1· arm64 · bookwormAffected
nvd · libpcap · debian · bookworm; nvd · libpcap · debian · 12
- [libpcap-dev]Affected
Source package: [libpcap]
Details (2)
1.10.3-1· amd64 · bookwormAffected
nvd · libpcap · debian · bookworm; nvd · libpcap · debian · 12
1.10.3-1· arm64 · bookwormAffected
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 · trixieAffected
nvd · libpcap · debian · 13
1.10.5-2· arm64 · trixieAffected
nvd · libpcap · debian · 13
- [libpcap0.8t64]Affected
Source package: [libpcap]
Details (2)
1.10.5-2· amd64 · trixieAffected
nvd · libpcap · debian · 13
1.10.5-2· arm64 · trixieAffected
nvd · libpcap · debian · 13
- [libpcap-dev]Affected
Source package: [libpcap]
Details (2)
1.10.5-2· amd64 · trixieAffected
nvd · libpcap · debian · 13
1.10.5-2· arm64 · trixieAffected
nvd · libpcap · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11744-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-6554]
- [https://osv.dev/vulnerability/ALPINE-CVE-2026-6554]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-6554]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-6554]
- [https://security-tracker.debian.org/tracker/CVE-2026-6554]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6554.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]