CVE-2026-12244

HIGHNVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-06-25. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

A fix is available — apply it.

If NSD is configured as secondary for a zone, the primary of that zone can crash NSD with an AXFR containing a DNS message with a special crafted SVCB RR with an rdata size of 65512, that let's an (uint16_t) variable that is used to allocate space needed for the RR wrap (because total size > 65535), causing a heap overflow. The attacker can perform a controlled (RCE class) head write of up to 65509 bytes

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity88% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
24.9%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 26, 2026

Advisory Details (1)

Auto-updated Jun 25, 2026
No patch confirmed yet.
generic
https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-12244.txt

Vendor Advisories for CVE-2026-12244(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
ubuntunsd (4.1.26-1ubuntu0.1~esm1) @ focal2026-07-16ubuntu

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(2)

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 9× 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 107 total refreshes for this CVE.

  1. 2026-07-24 14:17 UTCEPSS rescore
  2. 2026-07-23 14:18 UTCEPSS rescore
  3. 2026-07-23 03:05 UTCEG score recompute
  4. 2026-07-22 14:08 UTCEPSS rescore
  5. 2026-07-21 15:24 UTCEPSS rescore
  6. 2026-07-20 17:08 UTCEPSS rescore
  7. 2026-07-19 14:30 UTCEPSS rescore
  8. 2026-07-19 02:28 UTCEPSS rescore
  9. 2026-07-18 10:04 UTCEPSS rescore
  10. 2026-07-16 20:57 UTCVendor advisory
  11. 2026-07-16 20:57 UTCGHSA enrichment
  12. 2026-07-16 17:02 UTCEPSS rescore
  13. 2026-07-16 08:05 UTCVendor advisory
  14. 2026-07-16 08:05 UTCGHSA enrichment
  15. 2026-07-15 19:12 UTCVendor advisory
  16. 2026-07-15 19:12 UTCGHSA enrichment
  17. 2026-07-15 16:57 UTCEPSS rescore
  18. 2026-07-15 06:18 UTCGHSA enrichment
  19. 2026-07-15 02:00 UTCEPSS rescore
  20. 2026-07-14 17:25 UTCGHSA enrichment
  21. 2026-07-14 04:33 UTCVendor advisory
  22. 2026-07-14 04:33 UTCGHSA enrichment
  23. 2026-07-13 22:30 UTCEPSS rescore
  24. 2026-07-13 15:41 UTCVendor advisory
  25. 2026-07-13 15:41 UTCGHSA enrichment
Show 75 more
  1. 2026-07-13 06:12 UTCEPSS rescore
  2. 2026-07-13 02:47 UTCVendor advisory
  3. 2026-07-13 02:47 UTCGHSA enrichment
  4. 2026-07-12 13:54 UTCVendor advisory
  5. 2026-07-12 13:54 UTCGHSA enrichment
  6. 2026-07-12 05:46 UTCEPSS rescore
  7. 2026-07-12 01:02 UTCVendor advisory
  8. 2026-07-12 01:01 UTCGHSA enrichment
  9. 2026-07-11 12:08 UTCVendor advisory
  10. 2026-07-11 12:08 UTCGHSA enrichment
  11. 2026-07-11 08:27 UTCEPSS rescore
  12. 2026-07-10 23:16 UTCVendor advisory
  13. 2026-07-10 23:16 UTCGHSA enrichment
  14. 2026-07-10 10:22 UTCGHSA enrichment
  15. 2026-07-09 21:30 UTCVendor advisory
  16. 2026-07-09 21:30 UTCGHSA enrichment
  17. 2026-07-09 19:10 UTCEPSS rescore
  18. 2026-07-09 08:37 UTCGHSA enrichment
  19. 2026-07-08 19:39 UTCVendor advisory
  20. 2026-07-08 19:39 UTCGHSA enrichment
  21. 2026-07-08 06:46 UTCVendor advisory
  22. 2026-07-08 06:46 UTCGHSA enrichment
  23. 2026-07-07 17:54 UTCVendor advisory
  24. 2026-07-07 17:54 UTCGHSA enrichment
  25. 2026-07-07 13:46 UTCEPSS rescore
  26. 2026-07-07 04:47 UTCGHSA enrichment
  27. 2026-07-06 16:27 UTCEPSS rescore
  28. 2026-07-06 15:54 UTCGHSA enrichment
  29. 2026-07-06 03:03 UTCVendor advisory
  30. 2026-07-06 03:02 UTCGHSA enrichment
  31. 2026-07-06 02:23 UTCEPSS rescore
  32. 2026-07-05 14:08 UTCVendor advisory
  33. 2026-07-05 14:08 UTCGHSA enrichment
  34. 2026-07-05 02:30 UTCEPSS rescore
  35. 2026-07-05 02:30 UTCEPSS rescore
  36. 2026-07-05 01:16 UTCVendor advisory
  37. 2026-07-05 01:15 UTCGHSA enrichment
  38. 2026-07-04 12:12 UTCGHSA enrichment
  39. 2026-07-04 06:31 UTCEPSS rescore
  40. 2026-07-03 23:19 UTCVendor advisory
  41. 2026-07-03 23:19 UTCGHSA enrichment
  42. 2026-07-03 10:26 UTCVendor advisory
  43. 2026-07-03 10:26 UTCGHSA enrichment
  44. 2026-07-02 21:33 UTCVendor advisory
  45. 2026-07-02 21:33 UTCGHSA enrichment
  46. 2026-07-02 08:41 UTCGHSA enrichment
  47. 2026-07-01 19:46 UTCVendor advisory
  48. 2026-07-01 19:46 UTCGHSA enrichment
  49. 2026-07-01 15:06 UTCEPSS rescore
  50. 2026-07-01 15:06 UTCEPSS rescore
  51. 2026-07-01 06:53 UTCGHSA enrichment
  52. 2026-06-30 23:22 UTCEPSS rescore
  53. 2026-06-30 18:01 UTCVendor advisory
  54. 2026-06-30 18:01 UTCGHSA enrichment
  55. 2026-06-30 05:09 UTCVendor advisory
  56. 2026-06-30 05:08 UTCGHSA enrichment
  57. 2026-06-29 16:16 UTCVendor advisory
  58. 2026-06-29 16:15 UTCGHSA enrichment
  59. 2026-06-29 14:06 UTCEPSS rescore
  60. 2026-06-29 03:21 UTCVendor advisory
  61. 2026-06-29 03:21 UTCGHSA enrichment
  62. 2026-06-28 14:29 UTCVendor advisory
  63. 2026-06-28 14:29 UTCGHSA enrichment
  64. 2026-06-28 14:07 UTCEPSS rescore
  65. 2026-06-28 04:56 UTCEPSS rescore
  66. 2026-06-28 04:56 UTCEPSS rescore
  67. 2026-06-28 01:36 UTCVendor advisory
  68. 2026-06-28 01:36 UTCGHSA enrichment
  69. 2026-06-27 12:43 UTCVendor advisory
  70. 2026-06-27 12:43 UTCGHSA enrichment
  71. 2026-06-27 03:08 UTCEPSS rescore
  72. 2026-06-26 23:50 UTCVendor advisory
  73. 2026-06-26 23:50 UTCGHSA enrichment
  74. 2026-06-26 10:58 UTCEG score recompute▲ 0.10
  75. 2026-06-26 10:58 UTCVendor advisory

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-12244?
CVE-2026-12244 is a high vulnerability published on June 25, 2026. If NSD is configured as secondary for a zone, the primary of that zone can crash NSD with an AXFR containing a DNS message with a special crafted SVCB RR with an rdata size of 65512, that let's an (uint16_t) variable that is used to allocate space needed for the RR wrap (because total size >…
When was CVE-2026-12244 disclosed?
CVE-2026-12244 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12244 actively exploited?
CVE-2026-12244 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-12244?
CVE-2026-12244 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-12244?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12244, 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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