CVE-2026-4890

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-11. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 9%CVSS: 7.5Exploit: None knownExposed: 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)
EG Risk
52(Track)
EG Risk 52/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation9% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
9%
EPSS %ILE
95%
KEV
Not listed

Published

May 11, 2026

Last Modified

September 1, 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(7)

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

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntudnsmasq-utils (2.90-0ubuntu0.18.04.1+esm3) @ bionic2026-08-25ubuntu
redhatrhcos-4.19.9.6.202607151909-02026-07-22redhat
redhatdnsmasq-0:2.85-17.el9_6.12026-07-01redhat
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.

Affected Packages

(7 across 7 ecosystems)
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
dnsmasq—2.91-r1—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
dnsmasq—2.91-r1—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
dnsmasq—2.92_p2-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
dnsmasq2.85-1, 2.85-1+deb11u12.85-1+deb11u2—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
dnsmasq2.89-1, 2.90-1, 2.90-2, 2.90-3, 2.90-4~deb12u12.90-4~deb12u2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
dnsmasq2.91-12.91-1+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
dnsmasq2.91-1 ... 2.92~rc3-1 (9 versions)2.92-5—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

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 4× in last 7d / 38× 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 278 total refreshes for this CVE.

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

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 September 1, 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 9% probability of exploitation in the next 30 days, which ranks it in the top 5.0% of all scored CVEs.
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.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-4890

Explore →

Is Your Infrastructure Affected by CVE-2026-4890?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs