CVE-2026-50243

LOWNVD 3.73.7
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

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, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week

Also known asEUVD-2026-47673 (ENISA EUVD) · GHSA-vqq3-g95x-fpmr (GitHub Security Advisories)Source: ENISA EUVD

3.7EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 3.7Exploit: None knownExposed services: Not assessed

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
3.7LOWmedium confidence
EG Risk
17
EG Risk 17/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity37% × 45%
Impact severity (EG Severity): CVSS 3.7 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
1st
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (3.7): severity, escalated by confirmed exploitation. This CVE's 3.7 is its impact severity (EG Severity), not escalated.

EG Severity
3.7 LOWCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-29). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 22, 2026

Last Modified

October 24, 2026

Advisory Details (1)

Auto-updated Jul 22, 2026
Patch available.
Web page
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 / EcosystemFix (by version range) / 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

(7 across 7 ecosystems)
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • 1.6.2 up to 1.25.2-r0: fixed in 1.25.2-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • 1.6.2 up to 1.25.2-r0: fixed in 1.25.2-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
unbound—
  • 1.6.2 up to 1.25.2-r0: fixed in 1.25.2-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 ... 1.26.0-2 (15 versions)
  • every version up to 1.26.1-0+deb13u1: fixed in 1.26.1-0+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
unbound1.22.0-2 ... 1.25.1-1 (9 versions)
  • every version up to 1.25.2-1: fixed in 1.25.2-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 36× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 153 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 53 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-29 18:23 UTCEG score recompute
  2. 2026-10-29 18:23 UTCVendor advisory
  3. 2026-10-29 18:22 UTCGHSA enrichmentGHSA-vqq3-g95x-fpmr · GitHub CVSS 3.7
  4. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  5. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  6. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  7. 2026-10-25 14:22 UTCEG score recompute
  8. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  9. 2026-10-24 13:35 UTCEG score recompute
  10. 2026-10-24 13:35 UTCVendor advisory
  11. 2026-10-24 13:35 UTCGHSA enrichmentGHSA-vqq3-g95x-fpmr · GitHub CVSS 3.7
  12. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  13. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  14. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  15. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  16. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  17. 2026-10-18 03:33 UTCEG score recompute
  18. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  19. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  20. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  21. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  22. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  23. 2026-10-12 15:59 UTCEG score recompute
  24. 2026-10-11 19:42 UTCEG score recompute
  25. 2026-10-11 16:57 UTCEG score recompute
Show 75 more
  1. 2026-10-11 14:21 UTCEG score recompute
  2. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  3. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  4. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  5. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  6. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  7. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  8. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  9. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  10. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  11. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  12. 2026-10-01 11:16 UTCEG score recompute
  13. 2026-10-01 11:16 UTCVendor advisory
  14. 2026-10-01 11:16 UTCGHSA enrichmentGHSA-vqq3-g95x-fpmr · GitHub CVSS 3.7
  15. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  16. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  17. 2026-09-28 05:18 UTCEG score recompute
  18. 2026-09-28 05:18 UTCVendor advisory
  19. 2026-09-28 05:18 UTCGHSA enrichmentGHSA-vqq3-g95x-fpmr · GitHub CVSS 3.7
  20. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  21. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  22. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  23. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  24. 2026-09-22 23:59 UTCEG score recompute
  25. 2026-09-22 23:59 UTCVendor advisory
  26. 2026-09-22 23:59 UTCGHSA enrichmentGHSA-vqq3-g95x-fpmr · GitHub CVSS 3.7
  27. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  28. 2026-09-18 03:11 UTCEG score recompute
  29. 2026-09-18 03:11 UTCVendor advisory
  30. 2026-09-18 03:11 UTCGHSA enrichmentGHSA-vqq3-g95x-fpmr · GitHub CVSS 3.7
  31. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  32. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  33. 2026-09-14 09:36 UTCEG score recompute
  34. 2026-09-14 09:36 UTCVendor advisory
  35. 2026-09-14 09:36 UTCGHSA enrichmentGHSA-vqq3-g95x-fpmr · GitHub CVSS 3.7
  36. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  37. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  38. 2026-09-11 03:39 UTCEG score recompute
  39. 2026-09-11 03:39 UTCVendor advisory
  40. 2026-09-11 03:39 UTCGHSA enrichmentGHSA-vqq3-g95x-fpmr · GitHub CVSS 3.7
  41. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  42. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  43. 2026-09-07 21:42 UTCEG score recompute
  44. 2026-09-07 21:42 UTCVendor advisory
  45. 2026-09-07 21:42 UTCGHSA enrichmentGHSA-vqq3-g95x-fpmr · GitHub CVSS 3.7
  46. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  47. 2026-09-04 13:56 UTCEG score recompute
  48. 2026-09-04 13:56 UTCVendor advisory
  49. 2026-09-04 13:56 UTCGHSA enrichmentGHSA-vqq3-g95x-fpmr · GitHub CVSS 3.7
  50. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  51. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  52. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  53. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  54. 2026-08-30 20:59 UTCEG score recompute
  55. 2026-08-30 20:59 UTCVendor advisory
  56. 2026-08-30 20:59 UTCGHSA enrichmentGHSA-vqq3-g95x-fpmr · GitHub CVSS 3.7
  57. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  58. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  59. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  60. 2026-08-27 15:01 UTCEG score recompute
  61. 2026-08-27 15:01 UTCVendor advisory
  62. 2026-08-27 15:01 UTCGHSA enrichmentGHSA-vqq3-g95x-fpmr · GitHub CVSS 3.7
  63. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  64. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  65. 2026-08-24 09:04 UTCEG score recompute
  66. 2026-08-24 09:04 UTCVendor advisory
  67. 2026-08-24 09:04 UTCGHSA enrichmentGHSA-vqq3-g95x-fpmr · GitHub CVSS 3.7
  68. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  69. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  70. 2026-08-21 03:07 UTCEG score recompute
  71. 2026-08-21 03:07 UTCVendor advisory
  72. 2026-08-21 03:07 UTCGHSA enrichmentGHSA-vqq3-g95x-fpmr · GitHub CVSS 3.7
  73. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  74. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.1% · 1st percentile
  75. 2026-08-17 21:08 UTCEG score recompute

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

Frequently asked(5)

What is CVE-2026-50243?
CVE-2026-50243 is a low-severity vulnerability; its CVE record was 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 made public?
CVE-2026-50243 was made public on July 22, 2026: that is the date its CVE record's CNA, NLnet Labs, gives for when the vulnerability was made public. The CVE record itself was published on July 22, 2026. EchelonGraph's copy of the record carries a last-modified date of October 24, 2026; the record at its source may have been updated since.
Is CVE-2026-50243 actively exploited?
CVE-2026-50243 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-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?
A fix for CVE-2026-50243 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-50243 are linked in the Vendor Advisories panel on this page.

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