CVE-2026-4893

MEDIUMNVD 5.35.3
EchelonGraph scoreMEDIUM confidence

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

Score 5.3 from GitHub Security Advisory published 2026-05-11. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
5.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100

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)
Severity53% × 45%
The EG Score, 5.3 of 10.
Exploitation0.6% × 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
0.6%
EPSS %ILE
45th
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

May 12, 2026

Advisory Details (6)

Auto-updated May 12, 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

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

https://github.com/pi-hole/FTL/releases/tag/v6.6.2
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-2026-4893(6)

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 (2.90-0ubuntu0.20.04.1+esm2) @ focal2026-08-23ubuntu
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 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
—

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 10× in last 7d / 24× 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 245 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 145 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 0.6% · 45th percentile
  5. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  6. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  7. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  8. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  9. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  10. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  11. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  12. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  13. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  14. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  15. 2026-09-30 06:58 UTCOSV refresh
  16. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  17. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  18. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  19. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  20. 2026-09-23 17:53 UTCEPSS rescoreEPSS 1.8% · 77th percentile
  21. 2026-09-18 19:28 UTCEPSS rescoreEPSS 1.8% · 77th percentile
  22. 2026-09-16 14:08 UTCEPSS rescoreEPSS 1.8% · 77th percentile
  23. 2026-09-16 05:15 UTCEPSS rescoreEPSS 1.8% · 77th percentile
  24. 2026-09-13 16:47 UTCEPSS rescoreEPSS 1.8% · 77th percentile
  25. 2026-09-11 14:53 UTCEPSS rescoreEPSS 1.8% · 76th percentile
Show 75 more
  1. 2026-09-11 12:23 UTCOSV refresh
  2. 2026-09-10 09:35 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  3. 2026-09-08 22:01 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  4. 2026-09-07 16:01 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  5. 2026-09-06 13:47 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  6. 2026-09-04 05:06 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  7. 2026-09-02 14:12 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  8. 2026-09-01 13:54 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  9. 2026-09-01 04:40 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  10. 2026-08-30 19:17 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  11. 2026-08-30 01:22 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  12. 2026-08-28 21:41 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  13. 2026-08-27 14:25 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  14. 2026-08-26 14:46 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  15. 2026-08-25 13:49 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  16. 2026-08-23 18:37 UTCEG score recompute
  17. 2026-08-23 18:37 UTCVendor advisory
  18. 2026-08-23 18:37 UTCGHSA enrichmentGHSA-4rrv-pmrh-2vc4 · GitHub CVSS 5.3
  19. 2026-08-23 00:19 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  20. 2026-08-21 23:49 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  21. 2026-08-20 22:55 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  22. 2026-08-19 17:04 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  23. 2026-08-18 13:48 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  24. 2026-08-17 13:47 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  25. 2026-08-17 11:03 UTCEG score recompute
  26. 2026-08-17 11:03 UTCVendor advisory
  27. 2026-08-17 11:03 UTCGHSA enrichmentGHSA-4rrv-pmrh-2vc4 · GitHub CVSS 5.3
  28. 2026-08-16 14:56 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  29. 2026-08-16 04:25 UTCEG score recompute
  30. 2026-08-16 04:25 UTCVendor advisory
  31. 2026-08-16 04:25 UTCGHSA enrichmentGHSA-4rrv-pmrh-2vc4 · GitHub CVSS 5.3
  32. 2026-08-16 02:14 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  33. 2026-08-15 01:54 UTCEG score recompute
  34. 2026-08-15 01:54 UTCVendor advisory
  35. 2026-08-15 01:54 UTCGHSA enrichmentGHSA-4rrv-pmrh-2vc4 · GitHub CVSS 5.3
  36. 2026-08-15 01:30 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  37. 2026-08-14 02:56 UTCEG score recompute
  38. 2026-08-14 02:56 UTCVendor advisory
  39. 2026-08-14 02:56 UTCGHSA enrichmentGHSA-4rrv-pmrh-2vc4 · GitHub CVSS 5.3
  40. 2026-08-13 22:00 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  41. 2026-08-12 23:03 UTCEG score recompute
  42. 2026-08-12 23:03 UTCVendor advisory
  43. 2026-08-12 23:03 UTCGHSA enrichmentGHSA-4rrv-pmrh-2vc4 · GitHub CVSS 5.3
  44. 2026-08-12 13:51 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  45. 2026-08-12 00:07 UTCEG score recompute
  46. 2026-08-12 00:07 UTCVendor advisory
  47. 2026-08-12 00:07 UTCGHSA enrichmentGHSA-4rrv-pmrh-2vc4 · GitHub CVSS 5.3
  48. 2026-08-11 01:10 UTCEG score recompute
  49. 2026-08-11 01:10 UTCVendor advisory
  50. 2026-08-11 01:10 UTCGHSA enrichmentGHSA-4rrv-pmrh-2vc4 · GitHub CVSS 5.3
  51. 2026-08-11 00:00 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  52. 2026-08-10 01:10 UTCEG score recompute
  53. 2026-08-10 01:10 UTCVendor advisory
  54. 2026-08-10 01:10 UTCGHSA enrichmentGHSA-4rrv-pmrh-2vc4 · GitHub CVSS 5.3
  55. 2026-08-09 13:46 UTCEPSS rescoreEPSS 1.8% · 76th percentile
  56. 2026-08-09 02:14 UTCEG score recompute
  57. 2026-08-09 02:14 UTCVendor advisory
  58. 2026-08-09 02:14 UTCGHSA enrichmentGHSA-4rrv-pmrh-2vc4 · GitHub CVSS 5.3
  59. 2026-08-08 16:37 UTCEPSS rescoreEPSS 2.7% · 84th percentile
  60. 2026-08-07 19:48 UTCEG score recompute
  61. 2026-08-07 19:48 UTCVendor advisory
  62. 2026-08-07 19:48 UTCGHSA enrichmentGHSA-4rrv-pmrh-2vc4 · GitHub CVSS 5.3
  63. 2026-08-06 20:52 UTCEG score recompute
  64. 2026-08-06 20:52 UTCVendor advisory
  65. 2026-08-06 20:52 UTCGHSA enrichmentGHSA-4rrv-pmrh-2vc4 · GitHub CVSS 5.3
  66. 2026-08-06 13:47 UTCEPSS rescoreEPSS 2.7% · 84th percentile
  67. 2026-08-05 21:56 UTCEG score recompute
  68. 2026-08-05 21:56 UTCVendor advisory
  69. 2026-08-05 21:56 UTCGHSA enrichmentGHSA-4rrv-pmrh-2vc4 · GitHub CVSS 5.3
  70. 2026-08-05 19:17 UTCEPSS rescoreEPSS 2.7% · 84th percentile
  71. 2026-08-04 15:10 UTCEPSS rescoreEPSS 2.7% · 84th percentile
  72. 2026-08-04 10:39 UTCEPSS rescoreEPSS 2.7% · 84th percentile
  73. 2026-08-03 23:36 UTCEG score recompute
  74. 2026-08-03 23:36 UTCVendor advisory
  75. 2026-08-03 23:36 UTCGHSA enrichmentGHSA-4rrv-pmrh-2vc4 · GitHub CVSS 5.3

Related CVEs(same product + same vendor)

Frequently asked(5)

What is CVE-2026-4893?
CVE-2026-4893 is a medium-severity vulnerability; its CVE record was published on May 11, 2026. An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.
When was the CVE record for CVE-2026-4893 published?
The CVE record for CVE-2026-4893 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 May 12, 2026; the record at its source may have been updated since.
Is CVE-2026-4893 actively exploited?
CVE-2026-4893 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-4893?
CVE-2026-4893 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-4893?
A fix for CVE-2026-4893 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-4893 are linked in the Vendor Advisories panel on this page.

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