CVE-2026-4890

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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 (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.1%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation1.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.1%
EPSS %ILE
63rd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 11, 2026

Last Modified

September 1, 2026

Advisory Details (5)

Auto-updated May 11, 2026
Patch available. 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
Web page

Index of /dnsmasq/CVE

https://thekelleys.org.uk/dnsmasq/CVE/
Web page

[Dnsmasq-discuss] Security - IMPORTANT

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

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

https://github.com/NixOS/nixpkgs/pull/519093
Web page

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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.91-r1: fixed in 2.91-r1
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.91-r1: fixed in 2.91-r1
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq—
  • every version up to 2.92_p2-r0: fixed in 2.92_p2-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq2.85-1, 2.85-1+deb11u1
  • every version up to 2.85-1+deb11u2: fixed in 2.85-1+deb11u2
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq2.89-1, 2.90-1, 2.90-2, 2.90-3, 2.90-4~deb12u1
  • every version up to 2.90-4~deb12u2: fixed in 2.90-4~deb12u2
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq2.91-1
  • every version up to 2.91-1+deb13u1: fixed in 2.91-1+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
dnsmasq2.91-1 ... 2.92~rc3-1 (9 versions)
  • every version up to 2.92-5: fixed in 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 11× in last 7d / 26× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 300 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 200 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 19:43 UTCEG score recompute
  2. 2026-10-11 16:58 UTCEG score recompute
  3. 2026-10-11 14:22 UTCEG score recompute
  4. 2026-10-11 13:49 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  5. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  6. 2026-10-10 00:55 UTCOSV refresh
  7. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  8. 2026-10-08 17:12 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  9. 2026-10-07 23:48 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  10. 2026-10-06 15:18 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  11. 2026-10-05 17:43 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  12. 2026-10-04 23:22 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  13. 2026-10-03 14:26 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  14. 2026-10-01 19:50 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  15. 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  16. 2026-09-28 13:51 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  17. 2026-09-27 13:48 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  18. 2026-09-26 15:59 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  19. 2026-09-26 00:27 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  20. 2026-09-23 17:53 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  21. 2026-09-20 20:16 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  22. 2026-09-20 09:03 UTCOSV refresh
  23. 2026-09-18 19:28 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  24. 2026-09-16 14:08 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  25. 2026-09-16 05:15 UTCEPSS rescoreEPSS 8.8% · 94th percentile
Show 75 more
  1. 2026-09-13 16:47 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  2. 2026-09-11 14:53 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  3. 2026-09-10 09:35 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  4. 2026-09-08 22:01 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  5. 2026-09-07 16:01 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  6. 2026-09-06 13:47 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  7. 2026-09-04 05:06 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  8. 2026-09-02 14:12 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  9. 2026-09-01 13:54 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  10. 2026-09-01 12:21 UTCEG score recompute
  11. 2026-09-01 12:21 UTCVendor advisory
  12. 2026-09-01 12:21 UTCGHSA enrichmentGHSA-32px-jfgq-53xf · GitHub severity HIGH · GitHub CVSS 7.5
  13. 2026-09-01 04:40 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  14. 2026-08-30 19:17 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  15. 2026-08-30 01:22 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  16. 2026-08-28 21:41 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  17. 2026-08-27 14:25 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  18. 2026-08-26 14:46 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  19. 2026-08-25 13:49 UTCEPSS rescoreEPSS 8.8% · 94th percentile
  20. 2026-08-25 13:24 UTCVendor advisory
  21. 2026-08-25 13:24 UTCGHSA enrichmentGHSA-32px-jfgq-53xf · GitHub severity HIGH · GitHub CVSS 7.5
  22. 2026-08-25 12:21 UTCEG score recompute
  23. 2026-08-25 12:21 UTCVendor advisory
  24. 2026-08-25 12:21 UTCGHSA enrichmentGHSA-32px-jfgq-53xf · GitHub severity HIGH · GitHub CVSS 7.5
  25. 2026-08-24 13:30 UTCVendor advisory
  26. 2026-08-24 13:29 UTCGHSA enrichmentGHSA-32px-jfgq-53xf · GitHub severity HIGH · GitHub CVSS 7.5
  27. 2026-08-24 12:26 UTCEG score recompute
  28. 2026-08-24 12:26 UTCVendor advisory
  29. 2026-08-24 12:25 UTCGHSA enrichmentGHSA-32px-jfgq-53xf · GitHub severity HIGH · GitHub CVSS 7.5
  30. 2026-08-23 18:37 UTCEG score recompute
  31. 2026-08-23 18:37 UTCVendor advisory
  32. 2026-08-23 18:37 UTCGHSA enrichmentGHSA-32px-jfgq-53xf · GitHub severity HIGH · GitHub CVSS 7.5
  33. 2026-08-23 00:19 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
  34. 2026-08-21 23:49 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
  35. 2026-08-20 22:55 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
  36. 2026-08-19 17:04 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
  37. 2026-08-18 13:48 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
  38. 2026-08-17 11:09 UTCEG score recompute
  39. 2026-08-17 11:09 UTCVendor advisory
  40. 2026-08-17 11:09 UTCGHSA enrichmentGHSA-32px-jfgq-53xf · GitHub severity HIGH · GitHub CVSS 7.5
  41. 2026-08-16 14:56 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
  42. 2026-08-16 04:25 UTCEG score recompute
  43. 2026-08-16 04:25 UTCVendor advisory
  44. 2026-08-16 04:25 UTCGHSA enrichmentGHSA-32px-jfgq-53xf · GitHub severity HIGH · GitHub CVSS 7.5
  45. 2026-08-16 02:14 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
  46. 2026-08-15 01:30 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
  47. 2026-08-14 15:21 UTCVendor advisory
  48. 2026-08-14 15:21 UTCGHSA enrichmentGHSA-32px-jfgq-53xf · GitHub severity HIGH · GitHub CVSS 7.5
  49. 2026-08-14 02:57 UTCEG score recompute
  50. 2026-08-14 02:57 UTCVendor advisory
  51. 2026-08-14 02:57 UTCGHSA enrichmentGHSA-32px-jfgq-53xf · GitHub severity HIGH · GitHub CVSS 7.5
  52. 2026-08-13 22:00 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
  53. 2026-08-13 04:53 UTCVendor advisory
  54. 2026-08-13 04:53 UTCGHSA enrichmentGHSA-32px-jfgq-53xf · GitHub severity HIGH · GitHub CVSS 7.5
  55. 2026-08-12 16:29 UTCEG score recompute
  56. 2026-08-12 16:29 UTCVendor advisory
  57. 2026-08-12 16:29 UTCGHSA enrichmentGHSA-32px-jfgq-53xf · GitHub severity HIGH · GitHub CVSS 7.5
  58. 2026-08-12 13:51 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
  59. 2026-08-11 15:46 UTCEG score recompute
  60. 2026-08-11 15:46 UTCVendor advisory
  61. 2026-08-11 15:46 UTCGHSA enrichmentGHSA-32px-jfgq-53xf · GitHub severity HIGH · GitHub CVSS 7.5
  62. 2026-08-11 01:10 UTCEG score recompute
  63. 2026-08-11 01:10 UTCVendor advisory
  64. 2026-08-11 01:10 UTCGHSA enrichmentGHSA-32px-jfgq-53xf · GitHub severity HIGH · GitHub CVSS 7.5
  65. 2026-08-11 00:00 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
  66. 2026-08-10 03:01 UTCVendor advisory
  67. 2026-08-10 03:01 UTCGHSA enrichmentGHSA-32px-jfgq-53xf · GitHub severity HIGH · GitHub CVSS 7.5
  68. 2026-08-09 14:37 UTCEG score recompute
  69. 2026-08-09 14:37 UTCVendor advisory
  70. 2026-08-09 14:37 UTCGHSA enrichmentGHSA-32px-jfgq-53xf · GitHub severity HIGH · GitHub CVSS 7.5
  71. 2026-08-09 13:46 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
  72. 2026-08-09 02:14 UTCEG score recompute
  73. 2026-08-09 02:14 UTCVendor advisory
  74. 2026-08-09 02:14 UTCGHSA enrichmentGHSA-32px-jfgq-53xf · GitHub severity HIGH · GitHub CVSS 7.5
  75. 2026-08-08 16:37 UTCEPSS rescoreEPSS 7.2% · 93rd percentile

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Frequently asked(5)

What is CVE-2026-4890?
CVE-2026-4890 is a high-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-4890 published?
The CVE record for CVE-2026-4890 was published on May 11, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 1, 2026; the record at its source may have been updated since.
Is CVE-2026-4890 actively exploited?
CVE-2026-4890 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.1% probability of exploitation in the next 30 days (63rd percentile of EPSS-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?
A fix for CVE-2026-4890 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-4890 are linked in the Vendor Advisories panel on this page.

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