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CVE-2026-5947

A flaw was found in BIND. A remote attacker could exploit a race condition during SIG(0) signature validation of an incoming DNS message. If the "recursive-clients" limit is reached and the message is discarded, a use-after-free vulnerability may occur. This could lead to undefined behavior and potentially result in a denial of service.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:af4db68b6e515e41f6e09d34ab7534e2f2c84562803989b89c649f8625547164
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 11 assertions

{"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":"9.18.49","status":"unaffected","version":"9.18.28","versionType":"custom"},{"lessThanOrEqual":"9.18.49-S1","status":"unaffected","version":"9.18.28-S1","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/cna/affected/0

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:10"],"defaultStatus":"unaffected","packageName":"bind","product":"Red Hat Enterprise Linux 10","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/1

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:9"],"defaultStatus":"unaffected","packageName":"bind9.18","product":"Red Hat Enterprise Linux 9","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/7

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:9"],"defaultStatus":"unaffected","packageName":"bind","product":"Red Hat Enterprise Linux 9","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/6

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:8"],"defaultStatus":"unaffected","packageName":"bind9.16","product":"Red Hat Enterprise Linux 8","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/5

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift:4"],"defaultStatus":"unaffected","packageName":"rhcos","product":"Red Hat OpenShift Container Platform 4","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/9

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:hummingbird:1"],"defaultStatus":"affected","packageName":"bind-main","product":"Red Hat Hardened Images","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"9.18.48-1.1.hum1","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/0

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:6"],"defaultStatus":"unaffected","packageName":"bind","product":"Red Hat Enterprise Linux 6","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/2

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:9"],"defaultStatus":"unaffected","packageName":"dhcp","product":"Red Hat Enterprise Linux 9","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/8

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:8"],"defaultStatus":"unaffected","packageName":"bind","product":"Red Hat Enterprise Linux 8","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/4

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:7"],"defaultStatus":"unaffected","packageName":"bind","product":"Red Hat Enterprise Linux 7","vendor":"Red Hat"}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/3
cwe · 3 assertions

{"cweId":"CWE-362","description":"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-367","description":"Time-of-check Time-of-use (TOCTOU) Race Condition","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/problemTypes/0/descriptions/0

{"cweId":"CWE-416","description":"CWE-416 Use After Free","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/cna/problemTypes/0/descriptions/1

Affected products and versions

11 source assertions
{"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":"9.18.49","status":"unaffected","version":"9.18.28","versionType":"custom"},{"lessThanOrEqual":"9.18.49-S1","status":"unaffected","version":"9.18.28-S1","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/cna/affected/0
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:10"],"defaultStatus":"unaffected","packageName":"bind","product":"Red Hat Enterprise Linux 10","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/1
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:9"],"defaultStatus":"unaffected","packageName":"bind9.18","product":"Red Hat Enterprise Linux 9","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/7
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:9"],"defaultStatus":"unaffected","packageName":"bind","product":"Red Hat Enterprise Linux 9","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/6
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:8"],"defaultStatus":"unaffected","packageName":"bind9.16","product":"Red Hat Enterprise Linux 8","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/5
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift:4"],"defaultStatus":"unaffected","packageName":"rhcos","product":"Red Hat OpenShift Container Platform 4","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/9
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:hummingbird:1"],"defaultStatus":"affected","packageName":"bind-main","product":"Red Hat Hardened Images","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"9.18.48-1.1.hum1","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/0
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:6"],"defaultStatus":"unaffected","packageName":"bind","product":"Red Hat Enterprise Linux 6","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/2
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:9"],"defaultStatus":"unaffected","packageName":"dhcp","product":"Red Hat Enterprise Linux 9","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/8
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:8"],"defaultStatus":"unaffected","packageName":"bind","product":"Red Hat Enterprise Linux 8","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/4
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:7"],"defaultStatus":"unaffected","packageName":"bind","product":"Red Hat Enterprise Linux 7","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/affected/3

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/metrics/1/cvssV3_1
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

3 source assertions
{"cweId":"CWE-362","description":"CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-367","description":"Time-of-check Time-of-use (TOCTOU) Race Condition","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/problemTypes/0/descriptions/0
{"cweId":"CWE-416","description":"CWE-416 Use After Free","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/cna/problemTypes/0/descriptions/1

Source references

7 source assertions
{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:7412"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/references/3
{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-5947"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/references/0
{"name":"RHBZ#2479772","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2479772"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/references/1
{"tags":["patch"],"url":"https://downloads.isc.org/isc/bind9/9.20.23"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/cna/references/1
{"tags":["patch"],"url":"https://downloads.isc.org/isc/bind9/9.21.22"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/cna/references/2
{"name":"CVE-2026-5947","tags":["vendor-advisory"],"url":"https://kb.isc.org/docs/cve-2026-5947"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/cna/references/0
{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-5947.json"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:8579c3940d9dc19370f8d0508a9e58abd4203248e260d8e398b1ab668f0e62b5 · sha256:406e445270691994… · /containers/adp/1/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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