🛡️ CVE-2026-4748 — freebsd

🟠 CVSS 7.5 — High ✅ No Known Exploit CWE-480 NVD
7.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

Affected software

CVE-2026-4748 is recorded against 1 package.

  • freebsd

Timeline and source

Published on 1 April 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

security.freebsd.org

Details

Severity HIGH
CVSS Score 7.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE CWE-480
Public Exploit ✅ No
Source NVD
Published 2026-04-01
Updated 2026-08-11
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
freebsd — —

Similar Threats

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