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CVE-2026-4890

A denial of service vulnerability was discovered in dnsmasq's DNSSEC validation. When parsing NSEC and NSEC3 bitmap records, the window iteration logic fails to account for the 2-byte window header when advancing through the bitmap data. A specially crafted DNS response with a zero-length bitmap can cause an infinite loop, making dnsmasq unresponsive to all queries.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:95bb46fe3521ff068bd72f1bac07bf0d39ba5ccab2d3738259eaac916a32a2b3
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 8 assertions

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

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/affected/5

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift:4.19::el9"],"defaultStatus":"affected","packageName":"rhcos","product":"Red Hat OpenShift Container Platform 4.19","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"4.19.9.6.202607151909-0","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/affected/4

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

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/affected/6

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:10.2"],"defaultStatus":"affected","packageName":"dnsmasq","product":"Red Hat Enterprise Linux 10","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:2.90-7.el10_2","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/affected/0

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:enterprise_linux:8"],"defaultStatus":"affected","packageName":"dnsmasq","product":"Red Hat Enterprise Linux 8","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:2.79-36.el8_10","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/affected/1

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:rhel_eus:9.6"],"defaultStatus":"affected","packageName":"dnsmasq","product":"Red Hat Enterprise Linux 9.6 Extended Update Support","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:2.85-17.el9_6.1","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/affected/3

{"product":"dnsmasq","vendor":"dnsmasq","versions":[{"lessThan":"2.92rel2","status":"affected","version":"0","versionType":"custom"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/cna/affected/0

{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:enterprise_linux:9"],"defaultStatus":"affected","packageName":"dnsmasq","product":"Red Hat Enterprise Linux 9","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:2.85-18.el9_8.1","versionType":"rpm"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/affected/2
cwe · 2 assertions

{"cweId":"CWE-835","description":"Loop with Unreachable Exit Condition ('Infinite Loop')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/problemTypes/0/descriptions/0

{"description":"CWE-835: Loop with Unreachable Termination","lang":"en"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

8 source assertions
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:6"],"defaultStatus":"unknown","packageName":"dnsmasq","product":"Red Hat Enterprise Linux 6","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/affected/5
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift:4.19::el9"],"defaultStatus":"affected","packageName":"rhcos","product":"Red Hat OpenShift Container Platform 4.19","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"4.19.9.6.202607151909-0","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/affected/4
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:7"],"defaultStatus":"unknown","packageName":"dnsmasq","product":"Red Hat Enterprise Linux 7","vendor":"Red Hat"}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/affected/6
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:10.2"],"defaultStatus":"affected","packageName":"dnsmasq","product":"Red Hat Enterprise Linux 10","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:2.90-7.el10_2","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/affected/0
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:enterprise_linux:8"],"defaultStatus":"affected","packageName":"dnsmasq","product":"Red Hat Enterprise Linux 8","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:2.79-36.el8_10","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/affected/1
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:rhel_eus:9.6"],"defaultStatus":"affected","packageName":"dnsmasq","product":"Red Hat Enterprise Linux 9.6 Extended Update Support","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:2.85-17.el9_6.1","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/affected/3
{"product":"dnsmasq","vendor":"dnsmasq","versions":[{"lessThan":"2.92rel2","status":"affected","version":"0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/cna/affected/0
{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:enterprise_linux:9"],"defaultStatus":"affected","packageName":"dnsmasq","product":"Red Hat Enterprise Linux 9","vendor":"Red Hat","versions":[{"lessThan":"*","status":"unaffected","version":"0:2.85-18.el9_8.1","versionType":"rpm"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/affected/2

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:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /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:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/0/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-835","description":"Loop with Unreachable Exit Condition ('Infinite Loop')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/problemTypes/0/descriptions/0
{"description":"CWE-835: Loop with Unreachable Termination","lang":"en"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/cna/problemTypes/0/descriptions/0

Source references

14 source assertions
{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:19158"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/references/4
{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:19373"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/references/7
{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:20589"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/references/5
{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:34508"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/references/6
{"tags":["vendor-advisory","x_refsource_REDHAT"],"url":"https://access.redhat.com/errata/RHSA-2026:40762"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/references/3
{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-4890"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/references/0
{"name":"RHBZ#2458516","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2458516"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/references/1
{"url":"https://github.com/NixOS/nixpkgs/pull/519082"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/cna/references/4
{"url":"https://github.com/NixOS/nixpkgs/pull/519093"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/cna/references/3
{"url":"https://github.com/pi-hole/FTL/releases/tag/v6.6.2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/cna/references/5
{"url":"https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/cna/references/1
{"tags":["x_sadp-csaf-vex"],"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4890.json"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/adp/1/references/2
{"url":"https://thekelleys.org.uk/dnsmasq/CVE/"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/cna/references/2
{"url":"https://www.kb.cert.org/vuls/id/471747"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:54908803df14e6254e3ccdd4d84d352313c79007d8e41f0532bca7cf9bb52700 · sha256:b5178fbb00c886f7… · /containers/cna/references/0

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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