CVE-2026-2291

HIGHNVD 7.37.3—
EchelonGraph scoreMEDIUM confidence

Score 7.3 from GitHub Security Advisory (severity: HIGH) published 2026-05-11. NVD baseline CVSS 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.3Exploit: None knownExposed: 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 PROB
1%
EPSS %ILE
47%
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(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) @ jammy2026-08-23ubuntu
redhatrhcos-4.19.9.6.202608120446-02026-08-19redhat
redhatdnsmasq-0:2.85-17.el9_6.12026-07-01redhat
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.

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—

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 11× in last 7d / 89× 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 278 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. 2026-08-24 14:17 UTCEPSS rescore
  5. 2026-08-23 18:39 UTCEG score recompute
  6. 2026-08-23 18:39 UTCVendor advisory
  7. 2026-08-23 18:39 UTCGHSA enrichment
  8. 2026-08-23 00:19 UTCEPSS rescore
  9. 2026-08-21 23:49 UTCEPSS rescore
  10. 2026-08-20 22:55 UTCEPSS rescore
  11. 2026-08-20 22:55 UTCEPSS rescore
  12. 2026-08-19 17:03 UTCEPSS rescore
  13. 2026-08-18 13:48 UTCEPSS rescore
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-17 11:10 UTCEG score recompute
  16. 2026-08-17 11:10 UTCVendor advisory
  17. 2026-08-17 11:10 UTCGHSA enrichment
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 04:26 UTCEG score recompute
  20. 2026-08-16 04:26 UTCVendor advisory
  21. 2026-08-16 04:26 UTCGHSA enrichment
  22. 2026-08-16 02:14 UTCEPSS rescore
  23. 2026-08-15 01:30 UTCEPSS rescore
  24. 2026-08-14 14:44 UTCVendor advisory
  25. 2026-08-14 14:44 UTCGHSA enrichment
Show 75 more
  1. 2026-08-14 02:58 UTCEG score recompute
  2. 2026-08-14 02:58 UTCVendor advisory
  3. 2026-08-14 02:58 UTCGHSA enrichment
  4. 2026-08-13 22:00 UTCEPSS rescore
  5. 2026-08-13 04:17 UTCVendor advisory
  6. 2026-08-13 04:17 UTCGHSA enrichment
  7. 2026-08-12 16:30 UTCEG score recompute
  8. 2026-08-12 16:30 UTCVendor advisory
  9. 2026-08-12 16:30 UTCGHSA enrichment
  10. 2026-08-12 13:50 UTCEPSS rescore
  11. 2026-08-11 15:47 UTCEG score recompute
  12. 2026-08-11 15:47 UTCVendor advisory
  13. 2026-08-11 15:47 UTCGHSA enrichment
  14. 2026-08-11 13:42 UTCEPSS rescore
  15. 2026-08-11 01:25 UTCEG score recompute
  16. 2026-08-11 01:25 UTCVendor advisory
  17. 2026-08-11 01:24 UTCGHSA enrichment
  18. 2026-08-11 00:00 UTCEPSS rescore
  19. 2026-08-10 13:38 UTCVendor advisory
  20. 2026-08-10 13:38 UTCGHSA enrichment
  21. 2026-08-10 01:48 UTCVendor advisory
  22. 2026-08-10 01:48 UTCGHSA enrichment
  23. 2026-08-09 14:02 UTCEG score recompute
  24. 2026-08-09 14:02 UTCVendor advisory
  25. 2026-08-09 14:02 UTCGHSA enrichment
  26. 2026-08-09 13:46 UTCEPSS rescore
  27. 2026-08-09 02:15 UTCEG score recompute
  28. 2026-08-09 02:15 UTCVendor advisory
  29. 2026-08-09 02:15 UTCGHSA enrichment
  30. 2026-08-08 16:37 UTCEPSS rescore
  31. 2026-08-08 12:58 UTCVendor advisory
  32. 2026-08-08 12:58 UTCGHSA enrichment
  33. 2026-08-08 01:11 UTCEG score recompute
  34. 2026-08-08 01:11 UTCVendor advisory
  35. 2026-08-08 01:11 UTCGHSA enrichment
  36. 2026-08-07 13:24 UTCVendor advisory
  37. 2026-08-07 13:24 UTCGHSA enrichment
  38. 2026-08-07 01:37 UTCEG score recompute
  39. 2026-08-07 01:37 UTCVendor advisory
  40. 2026-08-07 01:37 UTCGHSA enrichment
  41. 2026-08-06 13:46 UTCEPSS rescore
  42. 2026-08-06 10:05 UTCVendor advisory
  43. 2026-08-06 10:05 UTCGHSA enrichment
  44. 2026-08-05 21:58 UTCEG score recompute
  45. 2026-08-05 21:58 UTCVendor advisory
  46. 2026-08-05 21:58 UTCGHSA enrichment
  47. 2026-08-05 19:17 UTCEPSS rescore
  48. 2026-08-04 15:10 UTCEPSS rescore
  49. 2026-08-03 19:26 UTCEG score recompute
  50. 2026-08-03 19:26 UTCVendor advisory
  51. 2026-08-03 19:26 UTCGHSA enrichment
  52. 2026-08-03 10:36 UTCEPSS rescore
  53. 2026-08-03 01:41 UTCVendor advisory
  54. 2026-08-03 01:41 UTCGHSA enrichment
  55. 2026-08-02 13:55 UTCEG score recompute
  56. 2026-08-02 13:55 UTCVendor advisory
  57. 2026-08-02 13:55 UTCGHSA enrichment
  58. 2026-08-02 02:26 UTCEPSS rescore
  59. 2026-08-02 02:08 UTCEG score recompute
  60. 2026-08-02 02:08 UTCVendor advisory
  61. 2026-08-02 02:08 UTCGHSA enrichment
  62. 2026-08-01 04:16 UTCEPSS rescore
  63. 2026-07-30 16:27 UTCEPSS rescore
  64. 2026-07-30 01:30 UTCEPSS rescore
  65. 2026-07-28 15:36 UTCEPSS rescore
  66. 2026-07-25 14:18 UTCEPSS rescore
  67. 2026-07-25 14:17 UTCEPSS rescore
  68. 2026-07-24 14:17 UTCEPSS rescore
  69. 2026-07-23 14:18 UTCEPSS rescore
  70. 2026-07-23 14:18 UTCEPSS rescore
  71. 2026-07-23 03:06 UTCEG score recompute
  72. 2026-07-22 14:08 UTCEPSS rescore
  73. 2026-07-22 14:08 UTCEPSS rescore
  74. 2026-07-21 15:24 UTCEPSS rescore
  75. 2026-07-21 15:24 UTCEPSS rescore

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 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 1% probability of exploitation in the next 30 days, which ranks it in the top 53.3% of all scored CVEs.
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.

Dependency Blast Radius

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