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
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 10.0Exploit: None knownExposed services: Not assessed

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
10.0CRITICALmedium confidence
EG Risk
45
EG Risk 45/100

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
Severity100% × 45%
Exploitation0% × 40%
Automatability0% × 15%
EPSS PROB
0.3%
EPSS %ILE
17th
KEV
Not listed

Published

May 20, 2026

Last Modified

July 24, 2026

Advisory Details (1)

Auto-updated Oct 9, 2026
Patch available.
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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntuunbound-host (1.9.4-2ubuntu1.11+esm1) @ focal2026-08-23ubuntu
ubuntuunbound-host (1.24.2-1ubuntu2.1) @ resolute2026-08-23ubuntu
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.

Affected Packages

(7 across 7 ecosystems)
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.25.2-r0: fixed in 1.25.2-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.25.2-r0: fixed in 1.25.2-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • every version up to 1.25.1-r0: fixed in 1.25.1-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
unbound1.13.1-1 ... 1.25.2-1 (47 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
unbound1.17.1-2 ... 1.26.1-1 (26 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
unbound1.22.0-2, 1.22.0-2+deb13u1, 1.22.0-2+deb13u2
  • every version up to 1.22.0-2+deb13u3: fixed in 1.22.0-2+deb13u3
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
unbound1.22.0-2 ... 1.25.0-1 (8 versions)
  • every version up to 1.25.1-1: fixed in 1.25.1-1
—

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 7× in last 7d / 24× 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 521 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

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 on May 20, 2026, with the most recent update on July 24, 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 0.3% probability of exploitation in the next 30 days (17th percentile of EPSS-scored CVEs).
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?
A fix for CVE-2026-42960 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-42960 are linked in the Vendor Advisories panel on this page.

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