CVE-2026-4748

Summary

A regression in the way hashes were calculated caused rules containing the address range syntax (x.x.x.x - y.y.y.y) that only differ in the address range(s) involved to be silently dropped as duplicates. Only the first of such rules is actually loaded into pf. Ranges expressed using the address[/mask-bits] syntax were not affected.

Some keywords representing actions taken on a packet-matching rule, such as 'log', 'return tll', or 'dnpipe', may suffer from the same issue. It is unlikely that users have such configurations, as these rules would always be redundant.

Affected rules are silently ignored, which can lead to unexpected behaviour including over- and underblocking.

Affected Software

Weaknesses

• CWE-480: CWE-480: Use of Incorrect Operator
• CWE-754: CWE-754: Improper Check for Unusual or Exceptional Conditions
• CWE-1023: CWE-1023: Incomplete Comparison with Missing Factors

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• https://security.freebsd.org/advisories/FreeBSD-SA-26:09.pf.asc

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