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CVE-2026-6554

medium CVSS 5.5 EPSS 0.1%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-6554 applies to, and the release that fixes it where the sources name one.

libpcap 1.10.5 fixed in 1.10.7

At a glance

Severity
Medium
CVSS base score
5.5 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.1% probability of exploitation in the next 30 days, higher than 1% of scored vulnerabilities
Weakness
CWE-835
Published
2026-09-05
NVD CVE.org

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