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Vulnerabilities

Vulnerability · 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 iterat

Published Sep 5, 2026 · catalog updated Oct 23, 2026 · libpcap BPF interpreter treats

Open the advisory

Exploitation likelihood is not on this record for CVE-2026-6554. A missing EPSS score is not a low risk. Compare libpcap BPF interpreter treats with the linked advisory before you change production.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (libpcap BPF interpreter treats).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Not in the current FIRST EPSS dataset
Remediation
Advisory link
Affected products
Alpine:v3.21 libpcap · Alpine:v3.22 libpcap · Alpine:v3.23 libpcap · Alpine:v3.24 libpcap

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Alpine:v3.21 libpcap0 → 1.10.7-r0
  • Alpine:v3.22 libpcap0 → 1.10.7-r0
  • Alpine:v3.23 libpcap0 → 1.10.7-r0
  • Alpine:v3.24 libpcap0 → 1.10.7-r0

How to fix CVE-2026-6554

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for CVE-2026-6554. A missing EPSS score is not a low risk. Compare libpcap BPF interpreter treats with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with 0 → 1.10.7-r0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS is absent from the current FIRST dataset. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 5, 2026 · OpenSSF OSV / OSV Scanner

    Detected

    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.

  2. Oct 23, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libpcap fixed in 1.10.7-r0; libpcap fixed in 1.10.7-r0; libpcap fixed in 1.10.7-r0; libpcap fixed in 1.10.7-r0

  3. Oct 23, 2026 · OpenSSF OSV / OSV Scanner

    Fix available

    libpcap fixed in 1.10.7-r0

  4. Oct 23, 2026 · OpenSSF OSV / OSV Scanner

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-6554

    Official CVE identifier

    cve.org
  • OpenSSF OSV / OSV ScannerPackage advisoryALPINE-CVE-2026-6554
    osv.dev
  • Trivy Vulnerability DBPackage advisoryALPINE-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 filter program or the 'protochain' primitive used on a crafted network packet can ca

    osv.dev

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.