CVE-2026-3593 (GCVE-0-2026-3593)

Vulnerability from cvelistv5 – Published: 2026-05-20 13:09 – Updated: 2026-06-30 12:09
VLAI
Title
Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation
Summary
A use-after-free vulnerability exists within the DNS-over-HTTPS implementation. 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 9.18.0 through 9.18.48 and 9.18.11-S1 through 9.18.48-S1 are NOT affected.
Severity
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
isc
References
Impacted products
Vendor Product Version
ISC BIND 9 Affected: 9.20.0 , ≤ 9.20.22 (custom)
Affected: 9.21.0 , ≤ 9.21.21 (custom)
Affected: 9.20.9-S1 , ≤ 9.20.22-S1 (custom)
Unaffected: 9.18.0 , ≤ 9.18.48 (custom)
Unaffected: 9.18.11-S1 , ≤ 9.18.48-S1 (custom)
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Red Hat Red Hat Hardened Images     cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat Enterprise Linux 10     cpe:/o:redhat:enterprise_linux:10
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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Date Public
2026-05-20 00:00
Credits
ISC would like to thank Naresh Kandula Parmar (Nottiboy) for bringing this vulnerability to our attention.
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      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-3593\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-05-20T13:40:34.896109Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-05-20T13:40:40.119Z\"}}], \"cna\": {\"title\": \"Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"value\": \"ISC would like to thank Naresh Kandula Parmar (Nottiboy) for bringing this vulnerability to our attention.\"}], \"impacts\": [{\"descriptions\": [{\"lang\": \"en\", \"value\": \"Crafted HTTP/2 traffic sent to a DNS-over-HTTPS endpoint can be used to trigger memory corruption.\"}]}], \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.4, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"ISC\", \"product\": \"BIND 9\", \"versions\": [{\"status\": \"affected\", \"version\": \"9.20.0\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"9.20.22\"}, {\"status\": \"affected\", \"version\": \"9.21.0\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"9.21.21\"}, {\"status\": \"affected\", \"version\": \"9.20.9-S1\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"9.20.22-S1\"}, {\"status\": \"unaffected\", \"version\": \"9.18.0\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"9.18.48\"}, {\"status\": \"unaffected\", \"version\": \"9.18.11-S1\", \"versionType\": \"custom\", \"lessThanOrEqual\": \"9.18.48-S1\"}], \"defaultStatus\": \"unaffected\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"We are not aware of any active exploits.\"}], \"solutions\": [{\"lang\": \"en\", \"value\": \"Upgrade to the patched release most closely related to your current version of BIND 9: 9.20.23, 9.21.22, or 9.20.23-S1.\"}], \"datePublic\": \"2026-05-20T00:00:00.000Z\", \"references\": [{\"url\": \"https://kb.isc.org/docs/cve-2026-3593\", \"name\": \"CVE-2026-3593\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://downloads.isc.org/isc/bind9/9.20.23\", \"tags\": [\"patch\"]}, {\"url\": \"https://downloads.isc.org/isc/bind9/9.21.22\", \"tags\": [\"patch\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Configurations not using DNS-over-HTTPS should not be affected.  Disabling DNS-over-HTTPS is likewise an effective workaround.\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A use-after-free vulnerability exists within the DNS-over-HTTPS implementation.\\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 9.18.0 through 9.18.48 and 9.18.11-S1 through 9.18.48-S1 are NOT affected.\"}], \"problemTypes\": [{\"descriptions\": [{\"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\": \"9.18.48\", \"versionStartIncluding\": \"9.18.0\"}, {\"criteria\": \"cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*\", \"vulnerable\": false, \"versionEndIncluding\": \"9.18.48-S1\", \"versionStartIncluding\": \"9.18.11-S1\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"404fd4d2-a609-4245-b543-2c944a302a22\", \"shortName\": \"isc\", \"dateUpdated\": \"2026-05-20T13:09:47.178Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-3593\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-20T13:40:45.166Z\", \"dateReserved\": \"2026-03-05T12:57:16.981Z\", \"assignerOrgId\": \"404fd4d2-a609-4245-b543-2c944a302a22\", \"datePublished\": \"2026-05-20T13:09:47.178Z\", \"assignerShortName\": \"isc\"}",
      "dataType": "CVE_RECORD",
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    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.