CVE-2026-4891

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-05-11. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 6%CVSS: 5.3Exploit: None knownExposed: 0

A fix is available — apply it.

A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
26(Track)
EG Risk 26/100SSVC: 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
Severity53% × 45%
Exploitation6% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
6%
EPSS %ILE
93%
KEV
Not listed

Published

May 11, 2026

Last Modified

September 1, 2026

Advisory Details (6)

Auto-updated May 12, 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

Release Pi-hole FTL v6.6.2 · pi-hole/FTL · GitHub

https://github.com/pi-hole/FTL/releases/tag/v6.6.2
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-2026-4891(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 (2.90-0ubuntu0.22.04.3) @ jammy2026-08-25ubuntu
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-0:2.90-7.el10_22026-05-19redhat
redhatdnsmasq-0:2.85-18.el9_8.12026-05-19redhat

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 230 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 11:03 UTCEG score recompute
  17. 2026-08-17 11:03 UTCVendor advisory
  18. 2026-08-17 11:03 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 02:57 UTCEG score recompute
  26. 2026-08-14 02:57 UTCVendor advisory
  27. 2026-08-14 02:57 UTCGHSA enrichment
  28. 2026-08-13 22:00 UTCEPSS rescore
  29. 2026-08-12 16:29 UTCEG score recompute
  30. 2026-08-12 16:29 UTCVendor advisory
  31. 2026-08-12 16:29 UTCGHSA enrichment
  32. 2026-08-12 13:51 UTCEPSS rescore
  33. 2026-08-11 02:25 UTCVendor advisory
  34. 2026-08-11 02:25 UTCGHSA enrichment
  35. 2026-08-10 02:20 UTCEG score recompute
  36. 2026-08-10 02:20 UTCVendor advisory
  37. 2026-08-10 02:20 UTCGHSA enrichment
  38. 2026-08-09 13:46 UTCEPSS rescore
  39. 2026-08-09 02:14 UTCEG score recompute
  40. 2026-08-09 02:14 UTCVendor advisory
  41. 2026-08-09 02:14 UTCGHSA enrichment
  42. 2026-08-08 16:37 UTCEPSS rescore
  43. 2026-08-08 01:42 UTCEG score recompute
  44. 2026-08-08 01:42 UTCVendor advisory
  45. 2026-08-08 01:42 UTCGHSA enrichment
  46. 2026-08-07 01:37 UTCEG score recompute
  47. 2026-08-07 01:37 UTCVendor advisory
  48. 2026-08-07 01:37 UTCGHSA enrichment
  49. 2026-08-06 13:47 UTCEPSS rescore
  50. 2026-08-05 21:57 UTCEG score recompute
  51. 2026-08-05 21:57 UTCVendor advisory
  52. 2026-08-05 21:57 UTCGHSA enrichment
  53. 2026-08-05 19:17 UTCEPSS rescore
  54. 2026-08-04 15:10 UTCEPSS rescore
  55. 2026-08-04 10:39 UTCEPSS rescore
  56. 2026-08-04 01:37 UTCEG score recompute
  57. 2026-08-04 01:37 UTCVendor advisory
  58. 2026-08-04 01:37 UTCGHSA enrichment
  59. 2026-08-03 10:36 UTCEPSS rescore
  60. 2026-08-03 01:31 UTCEG score recompute
  61. 2026-08-03 01:31 UTCVendor advisory
  62. 2026-08-03 01:31 UTCGHSA enrichment
  63. 2026-08-02 02:27 UTCEPSS rescore
  64. 2026-08-02 01:25 UTCEG score recompute
  65. 2026-08-02 01:25 UTCVendor advisory
  66. 2026-08-02 01:25 UTCGHSA enrichment
  67. 2026-08-01 04:16 UTCEPSS rescore
  68. 2026-07-30 16:28 UTCEPSS rescore
  69. 2026-07-30 01:30 UTCEPSS rescore
  70. 2026-07-28 15:37 UTCEPSS rescore
  71. 2026-07-26 14:54 UTCEPSS rescore
  72. 2026-07-26 08:22 UTCEG score recompute
  73. 2026-07-26 08:22 UTCVendor advisory
  74. 2026-07-26 08:22 UTCGHSA enrichment
  75. 2026-07-25 14:18 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-4891?
CVE-2026-4891 is a medium vulnerability published on May 11, 2026. A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.
When was CVE-2026-4891 disclosed?
CVE-2026-4891 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-2026-4891 actively exploited?
CVE-2026-4891 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6% probability of exploitation in the next 30 days, which ranks it in the top 6.6% of all scored CVEs.
What is the CVSS score of CVE-2026-4891?
CVE-2026-4891 has a CVSS v3.1 base score of 5.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-4891?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-4891, 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

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