Vulnerability-Lookup

FKIE_CVE-2026-3593

Vulnerability from fkie_nvd - Published: 2026-05-20 13:16 - Updated: 2026-08-24 13:18

Severity

7.4 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.4 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

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.

References

URL	Tags
security-officer@isc.org	https://downloads.isc.org/isc/bind9/9.20.23	Patch
security-officer@isc.org	https://downloads.isc.org/isc/bind9/9.21.22	Patch
security-officer@isc.org	https://kb.isc.org/docs/cve-2026-3593	Vendor Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:7412
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-3593
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2479770
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3593.json

Impacted products

	Vendor	Product	Version
	isc	bind	*
	isc	bind	*

JSON

To clipboard

{
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          "vendor": "ISC",
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    },
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CVE-2026-3593 (GCVE-0-2026-3593)

Vulnerability from cvelistv5 – Published: 2026-05-20 13:09 – Updated: 2026-09-01 12:04

Title

Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation

Summary

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 · CISA-ADP (v2.0.3)

Decision recorded 2026-05-20 13:40 UTC

CWE

CWE-416 - Use After Free
CWE-825 - Expired Pointer Dereference

Assigner

isc mitre root

References

7 references

URL	Tags
https://kb.isc.org/docs/cve-2026-3593	vendor-advisory
https://downloads.isc.org/isc/bind9/9.20.23	patch
https://downloads.isc.org/isc/bind9/9.21.22	patch
https://access.redhat.com/security/cve/CVE-2026-3593	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2479770	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:7412	vendor-advisoryx_refsource_REDHAT

Impacted products

8 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) cpe:2.3:a:isc:bind:::::::: cpe:2.3:a:isc:bind:::::::: cpe:2.3:a:isc:bind::::::::
Red Hat	Red Hat Hardened Images	Unaffected: 9.18.48-1.1.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Date Public

2026-05-20 00:00

Credits

ISC would like to thank Naresh Kandula Parmar (Nottiboy) for bringing this vulnerability to our attention.

Show details on NVD website

JSON

To clipboard

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            "time": "2026-05-21T11:59:02.348Z",
            "value": "Made public."
          }
        ],
        "title": "bind: Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation",
        "workarounds": [
          {
            "lang": "en",
            "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."
          }
        ],
        "x_adpType": "supplier",
        "x_generator": {
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        }
      }
    ],
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "BIND 9",
          "vendor": "ISC",
          "versions": [
            {
              "lessThanOrEqual": "9.20.22",
              "status": "affected",
              "version": "9.20.0",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "9.21.21",
              "status": "affected",
              "version": "9.21.0",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "9.20.22-S1",
              "status": "affected",
              "version": "9.20.9-S1",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "9.18.48",
              "status": "unaffected",
              "version": "9.18.0",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "9.18.48-S1",
              "status": "unaffected",
              "version": "9.18.11-S1",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*",
                  "versionEndIncluding": "9.20.22",
                  "versionStartIncluding": "9.20.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*",
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                  "criteria": "cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*",
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                }
              ],
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "ISC would like to thank Naresh Kandula Parmar (Nottiboy) for bringing this vulnerability to our attention."
        }
      ],
      "datePublic": "2026-05-20T00:00:00.000Z",
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        {
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        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "We are not aware of any active exploits."
        }
      ],
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        {
          "descriptions": [
            {
              "lang": "en",
              "value": "Crafted HTTP/2 traffic sent to a DNS-over-HTTPS endpoint can be used to trigger memory corruption."
            }
          ]
        }
      ],
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        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
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            "scope": "UNCHANGED",
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            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H",
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        {
          "descriptions": [
            {
              "cweId": "CWE-416",
              "description": "CWE-416 Use After Free",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-20T13:09:47.178Z",
        "orgId": "404fd4d2-a609-4245-b543-2c944a302a22",
        "shortName": "isc"
      },
      "references": [
        {
          "name": "CVE-2026-3593",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://kb.isc.org/docs/cve-2026-3593"
        },
        {
          "tags": [
            "patch"
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          "url": "https://downloads.isc.org/isc/bind9/9.20.23"
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          "tags": [
            "patch"
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          "url": "https://downloads.isc.org/isc/bind9/9.21.22"
        }
      ],
      "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."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Heap use-after-free vulnerability in BIND 9 DNS-over-HTTPS implementation",
      "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"
      }
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  "cveMetadata": {
    "assignerOrgId": "404fd4d2-a609-4245-b543-2c944a302a22",
    "assignerShortName": "isc",
    "cveId": "CVE-2026-3593",
    "datePublished": "2026-05-20T13:09:47.178Z",
    "dateReserved": "2026-03-05T12:57:16.981Z",
    "dateUpdated": "2026-09-01T12:04:55.362Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

FKIE_CVE-2026-3593

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

Tags

Sightings

Nomenclature

Related by attack behaviour