CVE-2026-50243

LOWNVD 3.73.7—
EchelonGraph scoreMEDIUM confidence

Score 3.7 from GitHub Security Advisory published 2026-07-22. NVD baseline CVSS 3.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
3.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 3.7Exploit: None knownExposed: 0

A fix is available — apply it.

In NLnet Labs Unbound 1.6.2 up to and including 1.25.1, when Unbound is configured with the 'respip' module in front of the validator together with a 'response-ip' redirect rule or an RPZ file with an RPZ-IP trigger, the rewriting handler does not check the security status of the upstream answer and can instead rewrite a BOGUS A/AAAA answer to point to an operator's configured IP. If the validator finds an expired or otherwise invalid RRSIG on an answer whose A record falls within a 'response-ip'/RPZ configuration, the answer is still rewritten and given a hard coded security level of INSECURE. This results in the client receiving an INSECURE NOERROR reply rewritten by the operator's configured IP. A malicious actor can exploit the possible poisonous effect by spoofing a BOGUS A/AAAA answer that falls inside the operator's configured subnet rewrites. Such DNSSEC protected answers are then insecurely redirected to the operator's configured target.

CVSS v3
3.7
EG Score
3.7(medium)
EG Risk
17(Track)
EG Risk 17/100SSVC: 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
Severity37% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
1%
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-2026-50243.txt

Vendor Advisories for CVE-2026-50243(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 10× in last 7d / 47× 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. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-14 09:36 UTCEG score recompute
  3. 2026-09-14 09:36 UTCVendor advisory
  4. 2026-09-14 09:36 UTCGHSA enrichment
  5. 2026-09-13 16:47 UTCEPSS rescore
  6. 2026-09-11 14:53 UTCEPSS rescore
  7. 2026-09-11 03:39 UTCEG score recompute
  8. 2026-09-11 03:39 UTCVendor advisory
  9. 2026-09-11 03:39 UTCGHSA enrichment
  10. 2026-09-10 09:35 UTCEPSS rescore
  11. 2026-09-08 22:01 UTCEPSS rescore
  12. 2026-09-07 21:42 UTCEG score recompute
  13. 2026-09-07 21:42 UTCVendor advisory
  14. 2026-09-07 21:42 UTCGHSA enrichment
  15. 2026-09-06 13:47 UTCEPSS rescore
  16. 2026-09-04 13:56 UTCEG score recompute
  17. 2026-09-04 13:56 UTCVendor advisory
  18. 2026-09-04 13:56 UTCGHSA enrichment
  19. 2026-09-04 05:06 UTCEPSS rescore
  20. 2026-09-02 14:12 UTCEPSS rescore
  21. 2026-09-01 13:54 UTCEPSS rescore
  22. 2026-09-01 04:40 UTCEPSS rescore
  23. 2026-08-30 20:59 UTCEG score recompute
  24. 2026-08-30 20:59 UTCVendor advisory
  25. 2026-08-30 20:59 UTCGHSA enrichment
Show 72 more
  1. 2026-08-30 19:17 UTCEPSS rescore
  2. 2026-08-30 01:22 UTCEPSS rescore
  3. 2026-08-28 21:41 UTCEPSS rescore
  4. 2026-08-27 15:01 UTCEG score recompute
  5. 2026-08-27 15:01 UTCVendor advisory
  6. 2026-08-27 15:01 UTCGHSA enrichment
  7. 2026-08-27 14:25 UTCEPSS rescore
  8. 2026-08-26 14:46 UTCEPSS rescore
  9. 2026-08-24 09:04 UTCEG score recompute
  10. 2026-08-24 09:04 UTCVendor advisory
  11. 2026-08-24 09:04 UTCGHSA enrichment
  12. 2026-08-23 00:19 UTCEPSS rescore
  13. 2026-08-21 23:49 UTCEPSS rescore
  14. 2026-08-21 03:07 UTCEG score recompute
  15. 2026-08-21 03:07 UTCVendor advisory
  16. 2026-08-21 03:07 UTCGHSA enrichment
  17. 2026-08-20 22:55 UTCEPSS rescore
  18. 2026-08-19 17:04 UTCEPSS rescore
  19. 2026-08-17 21:08 UTCEG score recompute
  20. 2026-08-17 21:08 UTCVendor advisory
  21. 2026-08-17 21:08 UTCGHSA enrichment
  22. 2026-08-17 13:47 UTCEPSS rescore
  23. 2026-08-16 14:56 UTCEPSS rescore
  24. 2026-08-16 02:14 UTCEPSS rescore
  25. 2026-08-15 01:30 UTCEPSS rescore
  26. 2026-08-14 15:10 UTCEG score recompute
  27. 2026-08-14 15:10 UTCVendor advisory
  28. 2026-08-14 15:10 UTCGHSA enrichment
  29. 2026-08-13 22:00 UTCEPSS rescore
  30. 2026-08-12 13:51 UTCEPSS rescore
  31. 2026-08-11 09:14 UTCEG score recompute
  32. 2026-08-11 09:14 UTCVendor advisory
  33. 2026-08-11 09:14 UTCGHSA enrichment
  34. 2026-08-11 00:00 UTCEPSS rescore
  35. 2026-08-09 13:46 UTCEPSS rescore
  36. 2026-08-08 16:37 UTCEPSS rescore
  37. 2026-08-08 03:17 UTCEG score recompute
  38. 2026-08-08 03:17 UTCVendor advisory
  39. 2026-08-08 03:17 UTCGHSA enrichment
  40. 2026-08-06 13:47 UTCEPSS rescore
  41. 2026-08-05 19:17 UTCEPSS rescore
  42. 2026-08-04 21:20 UTCEG score recompute
  43. 2026-08-04 21:20 UTCVendor advisory
  44. 2026-08-04 21:20 UTCGHSA enrichment
  45. 2026-08-04 15:10 UTCEPSS rescore
  46. 2026-08-04 10:39 UTCEPSS rescore
  47. 2026-08-03 10:36 UTCEPSS rescore
  48. 2026-08-01 15:23 UTCEG score recompute
  49. 2026-08-01 15:23 UTCVendor advisory
  50. 2026-08-01 15:23 UTCGHSA enrichment
  51. 2026-08-01 04:16 UTCEPSS rescore
  52. 2026-07-30 16:28 UTCEPSS rescore
  53. 2026-07-30 01:30 UTCEPSS rescore
  54. 2026-07-29 09:26 UTCEG score recompute
  55. 2026-07-29 09:26 UTCVendor advisory
  56. 2026-07-29 09:26 UTCGHSA enrichment
  57. 2026-07-28 15:37 UTCEPSS rescore
  58. 2026-07-26 03:29 UTCEG score recompute▼ 2.60
  59. 2026-07-26 03:29 UTCVendor advisory
  60. 2026-07-26 03:28 UTCGHSA enrichment
  61. 2026-07-25 14:18 UTCEPSS rescore
  62. 2026-07-24 14:18 UTCEPSS rescore
  63. 2026-07-24 14:12 UTCNVD updateCVSS v3 → 3.7 · severity → LOW
  64. 2026-07-23 14:18 UTCEPSS rescore
  65. 2026-07-23 03:18 UTCEG score recompute
  66. 2026-07-22 22:03 UTCEG score recompute
  67. 2026-07-22 22:03 UTCGHSA enrichment
  68. 2026-07-22 20:28 UTCEG score recompute
  69. 2026-07-22 20:28 UTCGHSA enrichment
  70. 2026-07-22 14:58 UTCEG score recompute
  71. 2026-07-22 13:17 UTCEG score recompute
  72. 2026-07-22 13:17 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-50243?
CVE-2026-50243 is a low vulnerability published on July 22, 2026. In NLnet Labs Unbound 1.6.2 up to and including 1.25.1, when Unbound is configured with the 'respip' module in front of the validator together with a 'response-ip' redirect rule or an RPZ file with an RPZ-IP trigger, the rewriting handler does not check the security status of the upstream answer…
When was CVE-2026-50243 disclosed?
CVE-2026-50243 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-2026-50243 actively exploited?
CVE-2026-50243 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 98.9% of all scored CVEs.
What is the CVSS score of CVE-2026-50243?
CVE-2026-50243 has a CVSS v3 base score of 3.7 (NVD).
How do I remediate CVE-2026-50243?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-50243, 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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