CVE-2026-6554 — MEDIUM (5.5)

Vulnerability Description

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. In particular uncommon use cases a crafted filter program can cause the interpreter to loop infinitely.

CVSS Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Related Weaknesses (CWE)

CWE-835

References

https://github.com/the-tcpdump-group/libpcap/commit/ff3c83475ac303c6b681c52ad0b6

FAQ

What is CVE-2026-6554?

CVE-2026-6554 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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. In particular...

How severe is CVE-2026-6554?

CVE-2026-6554 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-6554?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.