CVE-2026-4890

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-11. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 7%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
93.6%
KEV
Not listed

Published

May 11, 2026

Last Modified

July 2, 2026

Advisory Details (5)

Auto-updated May 11, 2026
No patch confirmed yet. Sources: cert.
cert

VU#471747 - dnsmasq contains several vulnerabilities, including attacker DNS redirect, privilege escalation, and heap manipulation

https://www.kb.cert.org/vuls/id/471747
generic

Index of /dnsmasq/CVE

https://thekelleys.org.uk/dnsmasq/CVE/
generic

[Dnsmasq-discuss] Security - IMPORTANT

https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html
generic

[Backport release-25.11] dnsmasq: 2.92 -> 2.92rel2 by LeSuisse · Pull Request #519093 · NixOS/nixpkgs · GitHub

https://github.com/NixOS/nixpkgs/pull/519093
generic

dnsmasq: 2.92 -> 2.92rel2 by LeSuisse · Pull Request #519082 · NixOS/nixpkgs · GitHub

https://github.com/NixOS/nixpkgs/pull/519082

Vendor Advisories for CVE-2026-4890(4)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntudnsmasq-utils (2.90-0ubuntu0.20.04.1+esm2) @ focal2026-06-28ubuntu
redhatdnsmasq-0:2.79-36.el8_102026-05-26redhat
redhatdnsmasq-0:2.85-18.el9_8.12026-05-19redhat
redhatdnsmasq-0:2.90-7.el10_22026-05-19redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(3)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× in last 7d / 104× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 170 total refreshes for this CVE.

  1. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 02:23 UTCEPSS rescore
  3. 2026-07-05 02:30 UTCEPSS rescore
  4. 2026-07-04 06:31 UTCEPSS rescore
  5. 2026-07-01 15:07 UTCEPSS rescore
  6. 2026-06-30 23:22 UTCEPSS rescore
  7. 2026-06-29 14:06 UTCEPSS rescore
  8. 2026-06-29 14:06 UTCEPSS rescore
  9. 2026-06-28 14:07 UTCEPSS rescore
  10. 2026-06-28 04:56 UTCEPSS rescore
  11. 2026-06-28 04:56 UTCEPSS rescore
  12. 2026-06-28 03:21 UTCEG score recompute
  13. 2026-06-28 03:21 UTCVendor advisory
  14. 2026-06-28 03:21 UTCGHSA enrichment
  15. 2026-06-27 09:43 UTCEG score recompute
  16. 2026-06-27 09:43 UTCVendor advisory
  17. 2026-06-27 09:43 UTCGHSA enrichment
  18. 2026-06-27 03:08 UTCEPSS rescore
  19. 2026-06-26 21:05 UTCEG score recompute
  20. 2026-06-26 21:05 UTCVendor advisory
  21. 2026-06-26 21:05 UTCGHSA enrichment
  22. 2026-06-26 04:50 UTCEG score recompute
  23. 2026-06-26 04:50 UTCVendor advisory
  24. 2026-06-26 04:50 UTCGHSA enrichment
  25. 2026-06-25 13:49 UTCEPSS rescore
Show 75 more
  1. 2026-06-24 14:05 UTCEPSS rescore
  2. 2026-06-23 21:33 UTCEPSS rescore
  3. 2026-06-23 21:33 UTCEPSS rescore
  4. 2026-06-22 14:25 UTCEPSS rescore
  5. 2026-06-22 14:25 UTCEPSS rescore
  6. 2026-06-21 14:56 UTCEPSS rescore
  7. 2026-06-21 14:56 UTCEPSS rescore
  8. 2026-06-21 01:59 UTCEPSS rescore
  9. 2026-06-21 01:59 UTCEPSS rescore
  10. 2026-06-19 19:26 UTCEPSS rescore
  11. 2026-06-19 19:26 UTCEPSS rescore
  12. 2026-06-18 17:52 UTCEPSS rescore
  13. 2026-06-18 17:52 UTCEPSS rescore
  14. 2026-06-17 17:53 UTCEPSS rescore
  15. 2026-06-17 00:57 UTCEG score recompute
  16. 2026-06-17 00:57 UTCVendor advisory
  17. 2026-06-17 00:57 UTCGHSA enrichment
  18. 2026-06-16 17:53 UTCEPSS rescore
  19. 2026-06-16 07:19 UTCEG score recompute
  20. 2026-06-16 07:19 UTCVendor advisory
  21. 2026-06-16 07:19 UTCGHSA enrichment
  22. 2026-06-15 17:49 UTCEPSS rescore
  23. 2026-06-15 17:49 UTCEPSS rescore
  24. 2026-06-15 02:57 UTCEG score recompute
  25. 2026-06-15 02:57 UTCVendor advisory
  26. 2026-06-15 02:57 UTCGHSA enrichment
  27. 2026-06-14 23:18 UTCEPSS rescore
  28. 2026-06-14 14:32 UTCEG score recompute
  29. 2026-06-14 14:32 UTCVendor advisory
  30. 2026-06-14 14:32 UTCGHSA enrichment
  31. 2026-06-14 01:53 UTCEG score recompute
  32. 2026-06-14 01:53 UTCVendor advisory
  33. 2026-06-14 01:53 UTCGHSA enrichment
  34. 2026-06-13 23:00 UTCEPSS rescore
  35. 2026-06-13 08:06 UTCEG score recompute
  36. 2026-06-13 08:06 UTCVendor advisory
  37. 2026-06-13 08:06 UTCGHSA enrichment
  38. 2026-06-12 23:12 UTCEPSS rescore
  39. 2026-06-12 23:12 UTCEPSS rescore
  40. 2026-06-12 17:46 UTCEG score recompute
  41. 2026-06-12 17:46 UTCVendor advisory
  42. 2026-06-12 17:46 UTCGHSA enrichment
  43. 2026-06-12 03:37 UTCEG score recompute
  44. 2026-06-12 03:37 UTCVendor advisory
  45. 2026-06-12 03:37 UTCGHSA enrichment
  46. 2026-06-11 15:13 UTCEG score recompute
  47. 2026-06-11 15:13 UTCVendor advisory
  48. 2026-06-11 15:13 UTCGHSA enrichment
  49. 2026-06-11 14:00 UTCEPSS rescore
  50. 2026-06-11 02:48 UTCEG score recompute
  51. 2026-06-11 02:48 UTCVendor advisory
  52. 2026-06-11 02:48 UTCGHSA enrichment
  53. 2026-06-10 22:19 UTCEPSS rescore
  54. 2026-06-10 14:24 UTCEG score recompute
  55. 2026-06-10 14:24 UTCVendor advisory
  56. 2026-06-10 14:24 UTCGHSA enrichment
  57. 2026-06-10 13:22 UTCEPSS rescore
  58. 2026-06-10 02:00 UTCEG score recompute
  59. 2026-06-10 02:00 UTCVendor advisory
  60. 2026-06-10 02:00 UTCGHSA enrichment
  61. 2026-06-09 13:36 UTCEG score recompute
  62. 2026-06-09 13:36 UTCVendor advisory
  63. 2026-06-09 13:36 UTCGHSA enrichment
  64. 2026-06-09 01:12 UTCEG score recompute
  65. 2026-06-09 01:12 UTCVendor advisory
  66. 2026-06-09 01:12 UTCGHSA enrichment
  67. 2026-06-08 14:17 UTCEPSS rescore
  68. 2026-06-08 14:17 UTCEPSS rescore
  69. 2026-06-08 12:45 UTCEG score recompute
  70. 2026-06-08 12:45 UTCVendor advisory
  71. 2026-06-08 12:45 UTCGHSA enrichment
  72. 2026-06-08 00:21 UTCEG score recompute
  73. 2026-06-08 00:21 UTCVendor advisory
  74. 2026-06-08 00:21 UTCGHSA enrichment
  75. 2026-06-07 15:25 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-4890?
CVE-2026-4890 is a high vulnerability published on May 11, 2026. A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.
When was CVE-2026-4890 disclosed?
CVE-2026-4890 was first published in the National Vulnerability Database on May 11, 2026, with the most recent update on July 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-4890 actively exploited?
CVE-2026-4890 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 93.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-4890?
CVE-2026-4890 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-4890?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-4890, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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