CVE-2026-5947 (GCVE-0-2026-5947)
Vulnerability from cvelistv5
Published
2026-05-20 13:10
Modified
2026-08-24 12:06
Severity ?
VLAI Severity ?
EPSS score ?
CWE
Summary
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
| URL | Tags | |
|---|---|---|
Impacted products
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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.\\nThis 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.\\nBIND 9 versions 9.18.28 through 9.18.49 and 9.18.28-S1 through 9.18.49-S1 are NOT affected.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-362\", \"description\": \"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)\"}, {\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndIncluding\": \"9.20.22\", \"versionStartIncluding\": \"9.20.0\"}, {\"criteria\": \"cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndIncluding\": \"9.21.21\", \"versionStartIncluding\": \"9.21.0\"}, {\"criteria\": \"cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndIncluding\": \"9.20.22-S1\", \"versionStartIncluding\": \"9.20.9-S1\"}, {\"criteria\": \"cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*\", \"vulnerable\": false, \"versionEndIncluding\": \"9.18.49\", \"versionStartIncluding\": \"9.18.28\"}, {\"criteria\": \"cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*\", \"vulnerable\": false, \"versionEndIncluding\": \"9.18.49-S1\", \"versionStartIncluding\": \"9.18.28-S1\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"404fd4d2-a609-4245-b543-2c944a302a22\", \"shortName\": \"isc\", \"dateUpdated\": \"2026-05-20T13:10:11.873Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-5947\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-24T12:06:50.906Z\", \"dateReserved\": \"2026-04-09T06:40:58.672Z\", \"assignerOrgId\": \"404fd4d2-a609-4245-b543-2c944a302a22\", \"datePublished\": \"2026-05-20T13:10:11.873Z\", \"assignerShortName\": \"isc\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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