CVE-2026-5947

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Source
https://cve.org/CVERecord?id=CVE-2026-5947
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-5947.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-5947
Downstream
Related
Published
2026-05-20T13:16:40.303Z
Modified
2026-05-31T02:56:28.924850Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

Undefined behavior may result due to a race condition leading to a use-after-free violation. If BIND receives an incoming DNS message signed with SIG(0), it begins work to validate that signature. If, during that validation, the "recursive-clients" limit is reached (as would occur during a query flood), and that same DNS message is discarded per the limit, there is a brief window of time while the SIG(0) validation may attempt to read the now-discarded DNS message. This issue affects BIND 9 versions 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, and 9.20.9-S1 through 9.20.22-S1. BIND 9 versions 9.18.28 through 9.18.49 and 9.18.28-S1 through 9.18.49-S1 are NOT affected.

References

Affected packages

Git / github.com/isc-projects/bind9

Affected ranges

Type
GIT
Repo
https://github.com/isc-projects/bind9
Events
Introduced
14bbdfc7b9db0870a0b8941ca8812d9983fdba1a
Fixed
7d0b4d4d436e7b950225a533e5bc56d8f935cc1c
Introduced
b732da695eecc0526950e2c722cde0bf23e5a070
Fixed
02a7b2c8a549b79cf885d1a0cda28b74de22d197
Database specific 
{
    "cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
    "extracted_events": [
        {
            "introduced": "9.20.0"
        },
        {
            "fixed": "9.20.23"
        },
        {
            "introduced": "9.21.0"
        },
        {
            "fixed": "9.21.22"
        }
    ],
    "source": "CPE_RANGE"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-5947.json"

Git / gitlab.isc.org/isc-projects/bind9

Affected ranges

Type
GIT
Repo
https://gitlab.isc.org/isc-projects/bind9
Events
Introduced
14bbdfc7b9db0870a0b8941ca8812d9983fdba1a
Fixed
7d0b4d4d436e7b950225a533e5bc56d8f935cc1c
Introduced
b732da695eecc0526950e2c722cde0bf23e5a070
Fixed
02a7b2c8a549b79cf885d1a0cda28b74de22d197
Database specific 
{
    "cpe": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*",
    "extracted_events": [
        {
            "introduced": "9.20.0"
        },
        {
            "fixed": "9.20.23"
        },
        {
            "introduced": "9.21.0"
        },
        {
            "fixed": "9.21.22"
        }
    ],
    "source": "CPE_RANGE"
}

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-5947.json"