CVE-2026-12528

MEDIUMNVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory published 2026-06-17. NVD baseline CVSS 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A flaw was found in 389 Directory Server in the __aclp__normalize_acltxt() function of aclparse.c. A malformed ACI (Access Control Instruction) string can trigger heap-buffer-overflow writes and reads during ACI parsing. The function fails to validate that the ACI keyword has sufficient length after whitespace stripping, leading to a 1-byte out-of-bounds write and subsequent out-of-bounds reads. An authenticated user with write access to the aci attribute could send a crafted ACI value to silently corrupt heap memory in the directory server process.

CVSS v3
5.4
EG Score
5.4(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity54% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
13%
KEV
Not listed

Published

June 17, 2026

Last Modified

June 28, 2026

Advisory Details (3)

Auto-updated Jun 18, 2026
Patch available. Sources: redhat, github_pr.
github_pr

Issue 7541 - heap-buffer-overflows in __aclp__normalize_acltxt()

Fix merged in 389ds/389-ds-base PR #7542 on 2026-06-18 — awaiting tagged release

https://github.com/389ds/389-ds-base/pull/7542
redhat

2489835 – (CVE-2026-12528) CVE-2026-12528 389-ds-base: 389-ds-base: heap-buffer-overflows in __aclp__normalize_acltxt()

https://bugzilla.redhat.com/show_bug.cgi?id=2489835
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-12528

Vendor Advisories for CVE-2026-12528(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
389-ds-base1.4.4.11-2 ... 3.1.2+vendor1-2 (23 versions)——
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 8× in last 7d / 37× 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 173 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-12528?
CVE-2026-12528 is a medium vulnerability published on June 17, 2026. A flaw was found in 389 Directory Server in the aclpnormalize_acltxt() function of aclparse.c. A malformed ACI (Access Control Instruction) string can trigger heap-buffer-overflow writes and reads during ACI parsing. The function fails to validate that the ACI keyword has sufficient length after…
When was CVE-2026-12528 disclosed?
CVE-2026-12528 was first published in the National Vulnerability Database on June 17, 2026, with the most recent update on June 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-12528 actively exploited?
CVE-2026-12528 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 86.6% of all scored CVEs.
What is the CVSS score of CVE-2026-12528?
CVE-2026-12528 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-12528?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-12528, 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.

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