CVE-2026-4748
Description
AI Translation Available
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.
480
Use of Incorrect Operator
DraftCommon Consequences
Security Scopes Affected:
Other
Potential Impacts:
Alter Execution Logic
Applicable Platforms
Languages:
C, C++, Not Language-Specific, Perl
754
Improper Check for Unusual or Exceptional Conditions
IncompleteCommon Consequences
Security Scopes Affected:
Integrity
Availability
Potential Impacts:
Dos: Crash, Exit, Or Restart
Unexpected State
Applicable Platforms
All platforms may be affected
1023
Incomplete Comparison with Missing Factors
IncompleteCommon Consequences
Security Scopes Affected:
Integrity
Access Control
Potential Impacts:
Alter Execution Logic
Bypass Protection Mechanism
Applicable Platforms
All platforms may be affected
https://security.freebsd.org/advisories/FreeBSD-SA-26:09.pf.asc