CVE-2026-42396

MEDIUMNVD 6.56.5
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.5 under NVD CVSS v3. EPSS exploit probability: 0.8% (54th percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 4.9 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-05-21) is not newer than that change (2026-07-23), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
6.5EG
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: 0.8%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Insufficient Validation of Member Zone Data May Cause Catalog Zone Transfer to Fail

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
30
EG Risk 30/100

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 (value × EchelonGraph’s weight)
Severity65% × 45%
The EG Score, 6.5 of 10.
Exploitation0.8% × 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
0.8%
EPSS %ILE
54th
KEV
Not listed

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

May 21, 2026

Last Modified

July 23, 2026

References (1)

Vendor Advisories for CVE-2026-42396(1)

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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
pdns4.4.1-1 ... 5.1.3-1 (53 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
pdns4.7.3-2 ... 5.1.4-1 (41 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
pdns4.9.14-0+deb13u1, 4.9.7-1
  • every version up to 4.9.15-0+deb13u1: fixed in 4.9.15-0+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
pdns4.9.7-1 ... 5.0.4-1 (7 versions)
  • every version up to 5.0.5-1: fixed in 5.0.5-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 27× 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 221 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 121 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  2. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  3. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  4. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  5. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  6. 2026-10-12 16:07 UTCEG score recompute
  7. 2026-10-11 19:49 UTCEG score recompute
  8. 2026-10-11 17:03 UTCEG score recompute
  9. 2026-10-11 14:29 UTCEG score recompute
  10. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  11. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  13. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  15. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  16. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  17. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  18. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  19. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  21. 2026-09-30 02:40 UTCOSV refresh
  22. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  23. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  24. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  25. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.4% · 29th percentile
Show 75 more
  1. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  2. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  3. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  4. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  5. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  6. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  7. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  8. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  9. 2026-09-11 04:23 UTCOSV refresh
  10. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  11. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  12. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  13. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  14. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  15. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  16. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  17. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  18. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  19. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  20. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  21. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  22. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  23. 2026-08-23 16:50 UTCEG score recompute
  24. 2026-08-23 16:50 UTCGHSA enrichmentGHSA-hm6h-mcgv-h2x8 · GitHub CVSS 4.9
  25. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  26. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  27. 2026-08-21 21:48 UTCEG score recompute
  28. 2026-08-21 21:47 UTCGHSA enrichmentGHSA-hm6h-mcgv-h2x8 · GitHub CVSS 4.9
  29. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  30. 2026-08-20 18:50 UTCEG score recompute
  31. 2026-08-20 18:50 UTCGHSA enrichmentGHSA-hm6h-mcgv-h2x8 · GitHub CVSS 4.9
  32. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  33. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  34. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  35. 2026-08-17 09:49 UTCEG score recompute
  36. 2026-08-17 09:49 UTCGHSA enrichmentGHSA-hm6h-mcgv-h2x8 · GitHub CVSS 4.9
  37. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  38. 2026-08-16 03:26 UTCEG score recompute
  39. 2026-08-16 03:26 UTCGHSA enrichmentGHSA-hm6h-mcgv-h2x8 · GitHub CVSS 4.9
  40. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  41. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  42. 2026-08-15 01:17 UTCGHSA enrichmentGHSA-hm6h-mcgv-h2x8 · GitHub CVSS 4.9
  43. 2026-08-14 01:58 UTCEG score recompute
  44. 2026-08-14 01:58 UTCGHSA enrichmentGHSA-hm6h-mcgv-h2x8 · GitHub CVSS 4.9
  45. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  46. 2026-08-12 23:11 UTCEG score recompute
  47. 2026-08-12 23:11 UTCGHSA enrichmentGHSA-hm6h-mcgv-h2x8 · GitHub CVSS 4.9
  48. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  49. 2026-08-11 23:51 UTCEG score recompute
  50. 2026-08-11 23:51 UTCGHSA enrichmentGHSA-hm6h-mcgv-h2x8 · GitHub CVSS 4.9
  51. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  52. 2026-08-11 00:32 UTCEG score recompute
  53. 2026-08-11 00:32 UTCGHSA enrichmentGHSA-hm6h-mcgv-h2x8 · GitHub CVSS 4.9
  54. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  55. 2026-08-10 00:48 UTCEG score recompute
  56. 2026-08-10 00:48 UTCGHSA enrichmentGHSA-hm6h-mcgv-h2x8 · GitHub CVSS 4.9
  57. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  58. 2026-08-09 01:29 UTCEG score recompute
  59. 2026-08-09 01:29 UTCGHSA enrichmentGHSA-hm6h-mcgv-h2x8 · GitHub CVSS 4.9
  60. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  61. 2026-08-07 19:53 UTCEG score recompute
  62. 2026-08-07 19:53 UTCGHSA enrichmentGHSA-hm6h-mcgv-h2x8 · GitHub CVSS 4.9
  63. 2026-08-06 20:33 UTCEG score recompute
  64. 2026-08-06 20:33 UTCGHSA enrichmentGHSA-hm6h-mcgv-h2x8 · GitHub CVSS 4.9
  65. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  66. 2026-08-05 21:14 UTCEG score recompute
  67. 2026-08-05 21:14 UTCGHSA enrichmentGHSA-hm6h-mcgv-h2x8 · GitHub CVSS 4.9
  68. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  69. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  70. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  71. 2026-08-03 16:52 UTCEG score recompute
  72. 2026-08-03 16:52 UTCGHSA enrichmentGHSA-hm6h-mcgv-h2x8 · GitHub CVSS 4.9
  73. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  74. 2026-08-02 16:52 UTCEG score recompute
  75. 2026-08-02 16:52 UTCGHSA enrichmentGHSA-hm6h-mcgv-h2x8 · GitHub CVSS 4.9

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Frequently asked(5)

What is CVE-2026-42396?
CVE-2026-42396 is a medium-severity vulnerability; its CVE record was published on May 21, 2026. Insufficient Validation of Member Zone Data May Cause Catalog Zone Transfer to Fail
When was CVE-2026-42396 made public?
CVE-2026-42396 was made public on May 19, 2026: that is the date its CVE record's CNA, Open-Xchange, gives for when the vulnerability was made public. The CVE record itself was published on May 21, 2026. EchelonGraph's copy of the record carries a last-modified date of July 23, 2026; the record at its source may have been updated since.
Is CVE-2026-42396 actively exploited?
CVE-2026-42396 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (54th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-42396?
CVE-2026-42396 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-42396?
A fix for CVE-2026-42396 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-42396 are linked in the Vendor Advisories panel on this page.

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