CVE-2026-18453

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-07. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in 389 Directory Server. A missing NULL pointer check in the paged results handling of op_shared_search allows an unauthenticated remote attacker to crash the LDAP server by sending a crafted sequence of search requests using the USE_ONE_BACKEND control, resulting in denial of service.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
56%
KEV
Not listed

Published

September 7, 2026

Last Modified

September 9, 2026

Advisory Details (2)

Auto-updated Sep 7, 2026
Patch available. Sources: redhat.
redhat

2509696 – (CVE-2026-18453) CVE-2026-18453 389-ds-base: 389-ds-base: pre-authentication NULL pointer dereference via paged results and USE_ONE_BACKEND control in op_shared_search

https://bugzilla.redhat.com/show_bug.cgi?id=2509696
redhat Patch Available

CVE-2026-18453 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-18453

Vendor Advisories for CVE-2026-18453(17)

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

Patch Availability(16)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatredhat-ds:12-9040020260903102623.1674d5742026-09-08redhat
redhat389-ds-base-0:2.2.4-22.el9_22026-09-08redhat
redhat389-ds-base-0:2.6.1-24.el9_62026-09-08redhat
redhatredhat-ds:12-9020020260903155914.1674d5742026-09-08redhat
redhat389-ds-base-0:3.0.6-21.el10_02026-09-08redhat
redhat389-ds-base-0:1.3.11.1-15.el7_92026-09-08redhat
redhat389-ds:1.4-8040020260901171549.96015a922026-09-08redhat
redhat389-ds-base-0:3.2.0-10.el10_22026-09-08redhat
redhat389-ds-base-0:2.8.0-10.el9_82026-09-08redhat
redhat389-ds-base-0:2.4.5-29.el9_42026-09-08redhat
redhatredhat-ds:11-8100020260904171440.37ed7c032026-09-08redhat
redhat389-ds:1.4-8100020260904155442.25e700aa2026-09-08redhat
redhatredhat-ds:11-8080020260903102346.f969626e2026-09-08redhat
redhat389-ds:1.4-8080020260831180218.6dbb38032026-09-08redhat
redhatdirsrv/dirsrv-container-rhel10:17888517652026-09-08redhat
redhat389-ds:1.4-8060020260901145727.824efc522026-09-08redhat

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

(2 across 2 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
389-ds-base2.3.1+dfsg1-1 ... 3.3.0-2 (16 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
389-ds-base3.1.2+dfsg1-1 ... 3.3.0-2 (6 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 39× in last 7d / 84× 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. 2026-09-19 11:54 UTCVendor advisory
  2. 2026-09-19 11:54 UTCGHSA enrichment
  3. 2026-09-18 23:28 UTCEG score recompute
  4. 2026-09-18 23:28 UTCVendor advisory
  5. 2026-09-18 23:28 UTCGHSA enrichment
  6. 2026-09-18 19:27 UTCEPSS rescore
  7. 2026-09-18 11:02 UTCVendor advisory
  8. 2026-09-18 11:02 UTCGHSA enrichment
  9. 2026-09-17 22:36 UTCEG score recompute
  10. 2026-09-17 22:36 UTCVendor advisory
  11. 2026-09-17 22:36 UTCGHSA enrichment
  12. 2026-09-17 10:09 UTCVendor advisory
  13. 2026-09-17 10:09 UTCGHSA enrichment
  14. 2026-09-16 21:43 UTCEG score recompute
  15. 2026-09-16 21:43 UTCVendor advisory
  16. 2026-09-16 21:43 UTCGHSA enrichment
  17. 2026-09-16 14:07 UTCEPSS rescore
  18. 2026-09-16 09:17 UTCEG score recompute
  19. 2026-09-16 09:17 UTCVendor advisory
  20. 2026-09-16 09:17 UTCGHSA enrichment
  21. 2026-09-16 05:14 UTCEPSS rescore
  22. 2026-09-15 20:51 UTCVendor advisory
  23. 2026-09-15 20:51 UTCGHSA enrichment
  24. 2026-09-15 08:21 UTCEG score recompute
  25. 2026-09-15 08:21 UTCVendor advisory
Show 59 more
  1. 2026-09-15 08:21 UTCGHSA enrichment
  2. 2026-09-14 19:56 UTCVendor advisory
  3. 2026-09-14 19:56 UTCGHSA enrichment
  4. 2026-09-14 07:31 UTCVendor advisory
  5. 2026-09-14 07:31 UTCGHSA enrichment
  6. 2026-09-13 19:06 UTCEG score recompute
  7. 2026-09-13 19:06 UTCVendor advisory
  8. 2026-09-13 19:06 UTCGHSA enrichment
  9. 2026-09-13 16:46 UTCEPSS rescore
  10. 2026-09-13 06:40 UTCVendor advisory
  11. 2026-09-13 06:40 UTCGHSA enrichment
  12. 2026-09-12 18:15 UTCEG score recompute
  13. 2026-09-12 18:15 UTCVendor advisory
  14. 2026-09-12 18:15 UTCGHSA enrichment
  15. 2026-09-12 15:00 UTCEPSS rescore
  16. 2026-09-12 05:50 UTCVendor advisory
  17. 2026-09-12 05:50 UTCGHSA enrichment
  18. 2026-09-11 17:25 UTCEG score recompute
  19. 2026-09-11 17:25 UTCVendor advisory
  20. 2026-09-11 17:25 UTCGHSA enrichment
  21. 2026-09-11 14:52 UTCEPSS rescore
  22. 2026-09-11 09:36 UTCEPSS rescore
  23. 2026-09-11 04:52 UTCVendor advisory
  24. 2026-09-11 04:52 UTCGHSA enrichment
  25. 2026-09-10 16:27 UTCEG score recompute
  26. 2026-09-10 16:27 UTCVendor advisory
  27. 2026-09-10 16:27 UTCGHSA enrichment
  28. 2026-09-10 09:34 UTCEPSS rescore
  29. 2026-09-10 03:56 UTCVendor advisory
  30. 2026-09-10 03:56 UTCGHSA enrichment
  31. 2026-09-09 15:31 UTCEG score recompute
  32. 2026-09-09 15:31 UTCVendor advisory
  33. 2026-09-09 15:31 UTCGHSA enrichment
  34. 2026-09-09 14:45 UTCEG score recompute
  35. 2026-09-09 14:45 UTCVendor advisory
  36. 2026-09-09 14:45 UTCGHSA enrichment
  37. 2026-09-09 10:58 UTCVendor advisory
  38. 2026-09-09 10:58 UTCGHSA enrichment
  39. 2026-09-08 22:32 UTCEG score recompute
  40. 2026-09-08 22:32 UTCGHSA enrichment
  41. 2026-09-08 22:04 UTCEG score recompute
  42. 2026-09-08 22:04 UTCGHSA enrichment
  43. 2026-09-08 22:00 UTCEPSS rescore
  44. 2026-09-08 19:51 UTCGHSA enrichment
  45. 2026-09-08 08:35 UTCGHSA enrichment
  46. 2026-09-08 07:31 UTCEG score recompute
  47. 2026-09-08 07:30 UTCGHSA enrichment
  48. 2026-09-08 06:39 UTCEG score recompute
  49. 2026-09-08 06:39 UTCGHSA enrichment
  50. 2026-09-08 06:23 UTCGHSA enrichment
  51. 2026-09-08 05:18 UTCGHSA enrichment
  52. 2026-09-08 04:19 UTCEG score recompute
  53. 2026-09-08 04:19 UTCGHSA enrichment
  54. 2026-09-08 03:30 UTCGHSA enrichment
  55. 2026-09-08 02:30 UTCEG score recompute
  56. 2026-09-08 02:30 UTCGHSA enrichment
  57. 2026-09-07 15:23 UTCEG score recompute
  58. 2026-09-07 14:28 UTCEG score recompute
  59. 2026-09-07 14:26 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-18453?
CVE-2026-18453 is a high vulnerability published on September 7, 2026. A flaw was found in 389 Directory Server. A missing NULL pointer check in the paged results handling of opsharedsearch allows an unauthenticated remote attacker to crash the LDAP server by sending a crafted sequence of search requests using the USEONEBACKEND control, resulting in denial of service.
When was CVE-2026-18453 disclosed?
CVE-2026-18453 was first published in the National Vulnerability Database on September 7, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18453 actively exploited?
CVE-2026-18453 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 43.5% of all scored CVEs.
What is the CVSS score of CVE-2026-18453?
CVE-2026-18453 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-18453?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18453, 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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