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
Trending — 4 sources updated this week
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)
EPSS
22.1%
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 (4.14.0-1ubuntu0.1~esm1) @ resolute2026-07-06ubuntu

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 42× in last 7d / 78× 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.

  1. 2026-07-07 04:47 UTCEG score recompute
  2. 2026-07-07 04:47 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 15:54 UTCEG score recompute
  5. 2026-07-06 15:54 UTCGHSA enrichment
  6. 2026-07-06 03:03 UTCEG score recompute
  7. 2026-07-06 03:03 UTCVendor advisory
  8. 2026-07-06 03:02 UTCGHSA enrichment
  9. 2026-07-06 02:23 UTCEPSS rescore
  10. 2026-07-05 14:08 UTCEG score recompute
  11. 2026-07-05 14:08 UTCVendor advisory
  12. 2026-07-05 14:08 UTCGHSA enrichment
  13. 2026-07-05 02:30 UTCEPSS rescore
  14. 2026-07-05 02:30 UTCEPSS rescore
  15. 2026-07-05 01:16 UTCEG score recompute
  16. 2026-07-05 01:16 UTCVendor advisory
  17. 2026-07-05 01:15 UTCGHSA enrichment
  18. 2026-07-04 12:13 UTCEG score recompute
  19. 2026-07-04 12:12 UTCGHSA enrichment
  20. 2026-07-04 06:31 UTCEPSS rescore
  21. 2026-07-03 23:19 UTCEG score recompute
  22. 2026-07-03 23:19 UTCVendor advisory
  23. 2026-07-03 23:19 UTCGHSA enrichment
  24. 2026-07-03 10:26 UTCEG score recompute
  25. 2026-07-03 10:26 UTCVendor advisory
Show 53 more
  1. 2026-07-03 10:26 UTCGHSA enrichment
  2. 2026-07-02 21:33 UTCEG score recompute
  3. 2026-07-02 21:33 UTCVendor advisory
  4. 2026-07-02 21:33 UTCGHSA enrichment
  5. 2026-07-02 08:41 UTCEG score recompute
  6. 2026-07-02 08:41 UTCGHSA enrichment
  7. 2026-07-01 19:46 UTCEG score recompute
  8. 2026-07-01 19:46 UTCVendor advisory
  9. 2026-07-01 19:46 UTCGHSA enrichment
  10. 2026-07-01 15:06 UTCEPSS rescore
  11. 2026-07-01 15:06 UTCEPSS rescore
  12. 2026-07-01 06:54 UTCEG score recompute
  13. 2026-07-01 06:53 UTCGHSA enrichment
  14. 2026-06-30 23:22 UTCEPSS rescore
  15. 2026-06-30 18:01 UTCEG score recompute
  16. 2026-06-30 18:01 UTCVendor advisory
  17. 2026-06-30 18:01 UTCGHSA enrichment
  18. 2026-06-30 05:09 UTCEG score recompute
  19. 2026-06-30 05:09 UTCVendor advisory
  20. 2026-06-30 05:08 UTCGHSA enrichment
  21. 2026-06-29 16:16 UTCEG score recompute
  22. 2026-06-29 16:16 UTCVendor advisory
  23. 2026-06-29 16:15 UTCGHSA enrichment
  24. 2026-06-29 14:06 UTCEPSS rescore
  25. 2026-06-29 03:21 UTCEG score recompute
  26. 2026-06-29 03:21 UTCVendor advisory
  27. 2026-06-29 03:21 UTCGHSA enrichment
  28. 2026-06-28 14:29 UTCEG score recompute
  29. 2026-06-28 14:29 UTCVendor advisory
  30. 2026-06-28 14:29 UTCGHSA enrichment
  31. 2026-06-28 14:07 UTCEPSS rescore
  32. 2026-06-28 04:56 UTCEPSS rescore
  33. 2026-06-28 04:56 UTCEPSS rescore
  34. 2026-06-28 01:36 UTCEG score recompute
  35. 2026-06-28 01:36 UTCVendor advisory
  36. 2026-06-28 01:36 UTCGHSA enrichment
  37. 2026-06-27 12:43 UTCEG score recompute
  38. 2026-06-27 12:43 UTCVendor advisory
  39. 2026-06-27 12:43 UTCGHSA enrichment
  40. 2026-06-27 03:08 UTCEPSS rescore
  41. 2026-06-26 23:50 UTCEG score recompute
  42. 2026-06-26 23:50 UTCVendor advisory
  43. 2026-06-26 23:50 UTCGHSA enrichment
  44. 2026-06-26 10:58 UTCEG score recompute▲ 0.10
  45. 2026-06-26 10:58 UTCVendor advisory
  46. 2026-06-26 10:58 UTCGHSA enrichment
  47. 2026-06-26 03:53 UTCNVD updateCVSS v3 → 8.8
  48. 2026-06-25 21:01 UTCEG score recompute
  49. 2026-06-25 21:01 UTCVendor advisory
  50. 2026-06-25 21:01 UTCGHSA enrichment
  51. 2026-06-25 13:49 UTCEPSS rescore
  52. 2026-06-25 08:06 UTCEG score recompute
  53. 2026-06-25 08:05 UTCNVD updatefirst tracked

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 22.1% 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.

Dependency Blast Radius

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