CVE-2026-6507

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-04-17. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

A fix is available — apply it.

A flaw was found in dnsmasq. A remote attacker could exploit an out-of-bounds write vulnerability by sending a specially crafted BOOTREPLY (Bootstrap Protocol Reply) packet to a dnsmasq server configured with the --dhcp-split-relay option. This can lead to memory corruption, causing the dnsmasq daemon to crash and resulting in a denial of service (DoS).

CVSS v3
7.5
EG Score
7.5(medium)
EPSS
38.3%
KEV
Not listed

Published

April 17, 2026

Last Modified

April 17, 2026

Advisory Details (2)

Auto-updated Jun 11, 2026
Patch available. Sources: redhat.
redhat Patch Available

2459181 – (CVE-2026-6507) CVE-2026-6507 dnsmasq: dnsmasq: Denial of Service due to out-of-bounds write in DHCP BOOTREPLY processing

https://bugzilla.redhat.com/show_bug.cgi?id=2459181
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-6507

Vendor Advisories for CVE-2026-6507(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntudnsmasq-utils (2.92-1ubuntu0.3) @ resolute2026-06-14ubuntu

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.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 11× in last 7d / 45× 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 125 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-6507?
CVE-2026-6507 is a high vulnerability published on April 17, 2026. A flaw was found in dnsmasq. A remote attacker could exploit an out-of-bounds write vulnerability by sending a specially crafted BOOTREPLY (Bootstrap Protocol Reply) packet to a dnsmasq server configured with the --dhcp-split-relay option. This can lead to memory corruption, causing the dnsmasq…
When was CVE-2026-6507 disclosed?
CVE-2026-6507 was first published in the National Vulnerability Database on April 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6507 actively exploited?
CVE-2026-6507 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 38.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-6507?
CVE-2026-6507 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-6507?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6507, 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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