CVE-2026-24281

HIGHNVD 7.47.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.4 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 53% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 7.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Hostname verification in Apache ZooKeeper ZKTrustManager falls back to reverse DNS (PTR) when IP SAN validation fails, allowing attackers who control or spoof PTR records to impersonate ZooKeeper servers or clients with a valid certificate for the PTR name. It's important to note that attacker must present a certificate which is trusted by ZKTrustManager which makes the attack vector harder to exploit. Users are recommended to upgrade to version 3.8.6 or 3.9.5, which fixes this issue by introducing a new configuration option to disable reverse DNS lookup in client and quorum protocols.

CVSS v3
7.4
EG Score
7.4HIGHmedium confidence
EG Risk
34
EG Risk 34/100

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
Severity74% × 45%
Exploitation1% × 40%
Automatability0% × 15%
EPSS PROB
0.6%
EPSS %ILE
49th
KEV
Not listed

Published

March 7, 2026

Last Modified

July 15, 2026

Advisory Details (10)

Auto-updated Jul 3, 2026
Patch available. Sources: redhat.
redhat Patch Available
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24281.json
redhat Patch Available

2445449 – (CVE-2026-24281) CVE-2026-24281 Apache ZooKeeper: Apache ZooKeeper: Impersonation of servers or clients via reverse DNS spoofing

https://bugzilla.redhat.com/show_bug.cgi?id=2445449
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-24281
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:8509
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:34608
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:14276
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:14272
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:10184
generic

oss-security - CVE-2026-24281: Apache ZooKeeper: Reverse-DNS fallback enables hostname verification bypass in ZooKeeper ZKTrustManager

http://www.openwall.com/lists/oss-security/2026/03/07/4
generic
https://lists.apache.org/thread/088ddsbrzhd5lxzbqf5n24yg0mwh9jt2

Vendor Advisories for CVE-2026-24281(6)

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

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatzookeeper2026-07-02redhat
redhatrhoai/odh-modelmesh-rhel9:17767568342026-04-23redhat

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

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
zookeeper3.4.13-6 ... 3.9.5-2 (22 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
zookeeper3.8.0-11 ... 3.9.6-1 (13 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
zookeeper3.9.3-1 ... 3.9.6-1 (8 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
zookeeper3.9.3-1, 3.9.3-2, 3.9.4-1, 3.9.4-2
  • every version up to 3.9.5-1: fixed in 3.9.5-1
—
Maven(1)
PackageVulnerable rangeFix by version rangeDependents
org.apache.zookeeper:zookeeper3.9.0, 3.9.1, 3.9.2, 3.9.3, 3.9.4
  • 3.8.0 up to 3.8.6: fixed in 3.8.6
  • 3.9.0 up to 3.9.5: fixed in 3.9.5
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 23× 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 135 total refreshes for this CVE.

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

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

Frequently asked(5)

What is CVE-2026-24281?
CVE-2026-24281 is a high vulnerability published on March 7, 2026. Hostname verification in Apache ZooKeeper ZKTrustManager falls back to reverse DNS (PTR) when IP SAN validation fails, allowing attackers who control or spoof PTR records to impersonate ZooKeeper servers or clients with a valid certificate for the PTR name. It's important to note that attacker must…
When was CVE-2026-24281 disclosed?
CVE-2026-24281 was first published on March 7, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-24281 actively exploited?
CVE-2026-24281 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (49th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-24281?
CVE-2026-24281 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2026-24281?
A fix for CVE-2026-24281 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-24281 are linked in the Vendor Advisories panel on this page.

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