CVE-2026-63442

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Source
https://cve.org/CVERecord?id=CVE-2026-63442
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63442.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-63442
Aliases
  • GHSA-2v2x-m4j7-76pv
Published
2026-10-15T15:22:16Z
Modified
2026-10-16T02:47:44Z
Severity
  • 8.1 (High) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H CVSS Calculator
Summary
OPNsense: Log Forgery via Login Username CRLF in WebGUI Authentication → Pf Table IP Blocking
Details

OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.11, the unauthenticated WebGUI login usernamefld accepts carriage-return and line-feed characters that survive LOG_AUTH processing through syslog-ng-lockout.conf into the syslog-ng program destination feeding lockout_handler. The consumer's readline() processing treats an injected fragment as a separate authentication event and selects the first syntactically valid IP address from the forged line. An attacker with network access to the login page can forge failure events for another IP, causing that IP to be added to the sshlockout PF table and its active states to be killed, or forge accepted events that reset an attacker's own brute-force counter. This can block administrative, DNS, gateway, or monitoring addresses and can bypass password-guessing lockout without authentication. This issue is fixed in version 26.1.11.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-117"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63442.json"
}
References

Affected packages

Git / github.com/opnsense/core

Affected ranges

Type
GIT
Repo
https://github.com/opnsense/core
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
c930ab586ffe2d2e010e5135657e5e054316ff58
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "26.1.11"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

Affected versions

15.*
15.1
15.1.1
15.1.10
15.1.10.2
15.1.11
15.1.11.1
15.1.11.2
15.1.11.3
15.1.11.4
15.1.12
15.1.2
15.1.3
15.1.4
15.1.5
15.1.6
15.1.6.1
15.1.7
15.1.7.1
15.1.7.2
15.1.8
15.1.8.1
15.1.8.2
15.1.8.3
15.1.8.4
15.1.9
15.1.9.1
15.1.9.2
15.7
16.*
16.7.a
16.7.b
16.7.r
17.*
17.1.a
17.1.b
17.1.r
17.7.a
17.7.b
17.7.r
18.*
18.1.a
18.1.b
18.1.r
18.7.a
18.7.b
18.7.r
19.*
19.1.a
19.1.b
19.1.r
19.7.a
19.7.b
19.7.r
20.*
20.1.a
20.1.b
20.1.r
20.7.a
20.7.b
20.7.r
21.*
21.1.a
21.1.b
21.1.r
21.7.a
21.7.b
21.7.r
22.*
22.1.a
22.1.b
22.1.r
22.7.a
22.7.b
22.7.r
23.*
23.1.a
23.1.b
23.1.r
23.7.a
23.7.b
23.7.r
24.*
24.1.a
24.1.b
24.1.r
24.7.a
24.7.b
24.7.r
25.*
25.1.a
25.1.b
25.1.r
25.7.a
25.7.b
25.7.r
26.*
26.1
26.1.1
26.1.10
26.1.2
26.1.3
26.1.4
26.1.5
26.1.6
26.1.7
26.1.8
26.1.9
26.1.a
26.1.b
26.1.r
26.1.r1
26.1.r2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63442.json"