CVE-2026-42960

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

Score 10.0 from GitHub Security Advisory published 2026-05-20. NVD baseline CVSS 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
10.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 10.0Exploit: NoneExposed: 0

A fix is available — apply it.

NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to poisoning via promiscuous records for the authority section. Promiscuous RRSets that complement DNS replies in the authority section can be used to trick Unbound to cache such records. If an adversary is able to attach such records in a reply (i.e., spoofed packet, fragmentation attack) he would be able to poison Unbound's cache. A malicious actor can exploit the possible poisonous effect by injecting RRSets other than NS that are also accompanied by address records in a reply, for example MX. This could be achieved by trying to spoof a reply packet or fragmentation attacks. Unbound would then accept the relative address records in the additional section and cache them if the authority RRSet has enough trust at this point, i.e., in-zone data for the delegation point. Unbound 1.25.1 contains a patch with a fix that disregards address records from the additional section if they are not explicitly relevant only to authority NS records, mitigating the possible poison effect. This is a complement fix to CVE-2025-11411.

CVSS v3
10.0
EG Score
10.0(medium)
EPSS
16.1%
KEV
Not listed

Published

May 20, 2026

Last Modified

May 20, 2026

Advisory Details (1)

Auto-updated Jul 7, 2026
No patch confirmed yet.
generic
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-42960.txt

Vendor Advisories for CVE-2026-42960(3)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuunbound-host (1.9.4-2ubuntu1.11+esm1) @ focal2026-06-29ubuntu
ubuntuunbound-host (1.24.2-1ubuntu2.1) @ resolute2026-06-29ubuntu
redhatunbound-main-1.25.1-1.hum12026-05-23redhat

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.

Additional Vendor Advisories

(2)

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 / 162× 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 390 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-42960?
CVE-2026-42960 is a critical vulnerability published on May 20, 2026. NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to poisoning via promiscuous records for the authority section. Promiscuous RRSets that complement DNS replies in the authority section can be used to trick Unbound to cache such records. If an adversary is able to attach such…
When was CVE-2026-42960 disclosed?
CVE-2026-42960 was first published in the National Vulnerability Database on May 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42960 actively exploited?
CVE-2026-42960 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 16.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42960?
CVE-2026-42960 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-42960?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42960, 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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