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
Trending — 4 sources updated this week
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

August 25, 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 19× in last 7d / 75× 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 211 total refreshes for this CVE.

  1. 2026-08-27 14:25 UTCEPSS rescore
  2. 2026-08-26 14:46 UTCEPSS rescore
  3. 2026-08-25 13:49 UTCEPSS rescore
  4. 2026-08-25 13:24 UTCVendor advisory
  5. 2026-08-25 13:24 UTCGHSA enrichment
  6. 2026-08-25 12:21 UTCEG score recompute
  7. 2026-08-25 12:21 UTCVendor advisory
  8. 2026-08-25 12:21 UTCGHSA enrichment
  9. 2026-08-24 13:30 UTCVendor advisory
  10. 2026-08-24 13:29 UTCGHSA enrichment
  11. 2026-08-24 12:26 UTCEG score recompute
  12. 2026-08-24 12:26 UTCVendor advisory
  13. 2026-08-24 12:25 UTCGHSA enrichment
  14. 2026-08-23 18:37 UTCEG score recompute
  15. 2026-08-23 18:37 UTCVendor advisory
  16. 2026-08-23 18:37 UTCGHSA enrichment
  17. 2026-08-23 00:19 UTCEPSS rescore
  18. 2026-08-21 23:49 UTCEPSS rescore
  19. 2026-08-20 22:55 UTCEPSS rescore
  20. 2026-08-19 17:04 UTCEPSS rescore
  21. 2026-08-18 13:48 UTCEPSS rescore
  22. 2026-08-17 11:03 UTCEG score recompute
  23. 2026-08-17 11:03 UTCVendor advisory
  24. 2026-08-17 11:03 UTCGHSA enrichment
  25. 2026-08-16 14:56 UTCEPSS rescore
Show 75 more
  1. 2026-08-16 04:25 UTCEG score recompute
  2. 2026-08-16 04:25 UTCVendor advisory
  3. 2026-08-16 04:25 UTCGHSA enrichment
  4. 2026-08-16 02:14 UTCEPSS rescore
  5. 2026-08-15 01:30 UTCEPSS rescore
  6. 2026-08-14 02:57 UTCEG score recompute
  7. 2026-08-14 02:57 UTCVendor advisory
  8. 2026-08-14 02:57 UTCGHSA enrichment
  9. 2026-08-13 22:00 UTCEPSS rescore
  10. 2026-08-12 16:29 UTCEG score recompute
  11. 2026-08-12 16:29 UTCVendor advisory
  12. 2026-08-12 16:29 UTCGHSA enrichment
  13. 2026-08-12 13:51 UTCEPSS rescore
  14. 2026-08-11 02:25 UTCVendor advisory
  15. 2026-08-11 02:25 UTCGHSA enrichment
  16. 2026-08-10 02:20 UTCEG score recompute
  17. 2026-08-10 02:20 UTCVendor advisory
  18. 2026-08-10 02:20 UTCGHSA enrichment
  19. 2026-08-09 13:46 UTCEPSS rescore
  20. 2026-08-09 02:14 UTCEG score recompute
  21. 2026-08-09 02:14 UTCVendor advisory
  22. 2026-08-09 02:14 UTCGHSA enrichment
  23. 2026-08-08 16:37 UTCEPSS rescore
  24. 2026-08-08 01:42 UTCEG score recompute
  25. 2026-08-08 01:42 UTCVendor advisory
  26. 2026-08-08 01:42 UTCGHSA enrichment
  27. 2026-08-07 01:37 UTCEG score recompute
  28. 2026-08-07 01:37 UTCVendor advisory
  29. 2026-08-07 01:37 UTCGHSA enrichment
  30. 2026-08-06 13:47 UTCEPSS rescore
  31. 2026-08-05 21:57 UTCEG score recompute
  32. 2026-08-05 21:57 UTCVendor advisory
  33. 2026-08-05 21:57 UTCGHSA enrichment
  34. 2026-08-05 19:17 UTCEPSS rescore
  35. 2026-08-04 15:10 UTCEPSS rescore
  36. 2026-08-04 10:39 UTCEPSS rescore
  37. 2026-08-04 01:37 UTCEG score recompute
  38. 2026-08-04 01:37 UTCVendor advisory
  39. 2026-08-04 01:37 UTCGHSA enrichment
  40. 2026-08-03 10:36 UTCEPSS rescore
  41. 2026-08-03 01:31 UTCEG score recompute
  42. 2026-08-03 01:31 UTCVendor advisory
  43. 2026-08-03 01:31 UTCGHSA enrichment
  44. 2026-08-02 02:27 UTCEPSS rescore
  45. 2026-08-02 01:25 UTCEG score recompute
  46. 2026-08-02 01:25 UTCVendor advisory
  47. 2026-08-02 01:25 UTCGHSA enrichment
  48. 2026-08-01 04:16 UTCEPSS rescore
  49. 2026-07-30 16:28 UTCEPSS rescore
  50. 2026-07-30 01:30 UTCEPSS rescore
  51. 2026-07-28 15:37 UTCEPSS rescore
  52. 2026-07-26 14:54 UTCEPSS rescore
  53. 2026-07-26 08:22 UTCEG score recompute
  54. 2026-07-26 08:22 UTCVendor advisory
  55. 2026-07-26 08:22 UTCGHSA enrichment
  56. 2026-07-25 14:18 UTCEPSS rescore
  57. 2026-07-24 14:18 UTCEPSS rescore
  58. 2026-07-23 14:18 UTCEPSS rescore
  59. 2026-07-23 03:18 UTCEG score recompute
  60. 2026-07-22 14:08 UTCEPSS rescore
  61. 2026-07-21 15:25 UTCEPSS rescore
  62. 2026-07-20 17:08 UTCEPSS rescore
  63. 2026-07-19 14:31 UTCEPSS rescore
  64. 2026-07-19 14:31 UTCEPSS rescore
  65. 2026-07-19 02:29 UTCEPSS rescore
  66. 2026-07-18 10:04 UTCEPSS rescore
  67. 2026-07-16 17:03 UTCEPSS rescore
  68. 2026-07-16 10:53 UTCOSV refresh
  69. 2026-07-15 16:57 UTCEPSS rescore
  70. 2026-07-15 16:57 UTCEPSS rescore
  71. 2026-07-15 02:00 UTCEPSS rescore
  72. 2026-07-15 02:00 UTCEPSS rescore
  73. 2026-07-13 22:31 UTCEPSS rescore
  74. 2026-07-13 06:13 UTCEPSS rescore
  75. 2026-07-13 06:13 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 August 25, 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 6.8% 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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