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 50% 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)
EPSS
50.6%
KEV
Not listed

Published

May 11, 2026

Last Modified

May 13, 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(3)

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 8× in last 7d / 107× 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 192 total refreshes for this CVE.

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

Related CVEs(same vendor)

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 May 13, 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 50.6% 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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