CVE-2026-2291

HIGHNVD 7.37.3—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.3 under NVD CVSS v3. EPSS exploit probability: 0.8%, top 48% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.3
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.3Exploit: NoneExposed: 0

A fix is available — apply it.

dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.

CVSS v3
7.3
EG Score
7.3(medium)
EG Risk
33(Track)
EG Risk 33/100SSVC: 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
Severity73% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
51.8%
KEV
Not listed

Published

May 11, 2026

Last Modified

July 20, 2026

Advisory Details (7)

Auto-updated Jun 11, 2026
Patch available. Sources: github_pr, github_release, cert.
generic

CVE-2026-2291 Common Vulnerabilities and Exposures | SUSE

https://www.suse.com/security/cve/CVE-2026-2291.html
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
github_release Patch Available

Pi-hole FTL v6.6.2

Patch available: pi-hole/FTL v6.6.2

https://github.com/pi-hole/FTL/releases/tag/v6.6.2
github_pr

[Backport release-25.11] dnsmasq: 2.92 -> 2.92rel2

Fix merged in NixOS/nixpkgs PR #519093 on 2026-05-11 — awaiting tagged release

https://github.com/NixOS/nixpkgs/pull/519093
github_pr

dnsmasq: 2.92 -> 2.92rel2

Fix merged in NixOS/nixpkgs PR #519082 on 2026-05-11 — awaiting tagged release

https://github.com/NixOS/nixpkgs/pull/519082

Vendor Advisories for CVE-2026-2291(4)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntudnsmasq-utils (2.90-2ubuntu0.3) @ noble2026-06-28ubuntu
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.

Additional Vendor Advisories

(3)

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 14× in last 7d / 53× 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 183 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-2291?
CVE-2026-2291 is a high vulnerability published on May 11, 2026. dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.
When was CVE-2026-2291 disclosed?
CVE-2026-2291 was first published in the National Vulnerability Database on May 11, 2026, with the most recent update on July 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-2291 actively exploited?
CVE-2026-2291 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 51.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-2291?
CVE-2026-2291 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-2291?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-2291, 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.

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