CVE-2026-50248

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-07-22. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when an auth/rpz zone has a configured primary hostname that resolves to BOGUS A/AAAA, it is still considered as a possible XFR endpoint. A malicious actor that can spoof the hostname's A/AAAA record (no valid RRSIG required) becomes the zone's XFR primary and can replaces the entire zone/the resolver's entire response policy.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

July 22, 2026

Last Modified

July 24, 2026

Advisory Details (1)

Auto-updated Jul 22, 2026
No patch confirmed yet.
generic
https://www.nlnetlabs.nl/downloads/unbound/CVE-2026-50248.txt

Vendor Advisories for CVE-2026-50248(3)

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
redhatunbound-main-1.25.2-0.1.hum12026-07-22redhat

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

(5 across 5 ecosystems)
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
unbound—1.25.2-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
unbound1.13.1-1 ... 1.25.2-1 (47 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
unbound1.17.1-2 ... 1.26.0-2 (25 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
unbound1.22.0-2 ... 1.26.0-2 (15 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
unbound1.22.0-2 ... 1.25.1-1 (9 versions)1.25.2-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 85× 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 176 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-50248?
CVE-2026-50248 is a medium vulnerability published on July 22, 2026. In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when an auth/rpz zone has a configured primary hostname that resolves to BOGUS A/AAAA, it is still considered as a possible XFR endpoint. A malicious actor that can spoof the hostname's A/AAAA record (no valid RRSIG required) becomes the…
When was CVE-2026-50248 disclosed?
CVE-2026-50248 was first published in the National Vulnerability Database on July 22, 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-2026-50248 actively exploited?
CVE-2026-50248 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 97.2% of all scored CVEs.
What is the CVSS score of CVE-2026-50248?
CVE-2026-50248 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-50248?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50248, 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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