CVE-2026-12528

MEDIUMNVD 5.45.4—
EchelonGraph scoreHIGH 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
5.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.4Exploit: NoneExposed: 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(high)
EPSS
13.2%
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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 64× 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. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 15:50 UTCEG score recompute
  3. 2026-07-06 15:50 UTCGHSA enrichment
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-05 15:38 UTCEG score recompute
  6. 2026-07-05 15:38 UTCGHSA enrichment
  7. 2026-07-05 02:30 UTCEPSS rescore
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-04 15:41 UTCEG score recompute
  10. 2026-07-04 15:40 UTCGHSA enrichment
  11. 2026-07-04 06:31 UTCEPSS rescore
  12. 2026-07-03 15:39 UTCEG score recompute
  13. 2026-07-03 15:39 UTCGHSA enrichment
  14. 2026-07-02 15:42 UTCEG score recompute
  15. 2026-07-02 15:42 UTCGHSA enrichment
  16. 2026-07-01 15:44 UTCEG score recompute
  17. 2026-07-01 15:43 UTCGHSA enrichment
  18. 2026-07-01 15:06 UTCEPSS rescore
  19. 2026-07-01 15:06 UTCEPSS rescore
  20. 2026-06-30 23:22 UTCEPSS rescore
  21. 2026-06-30 15:45 UTCEG score recompute
  22. 2026-06-30 15:45 UTCGHSA enrichment
  23. 2026-06-29 15:47 UTCEG score recompute
  24. 2026-06-29 15:47 UTCGHSA enrichment
  25. 2026-06-29 14:06 UTCEPSS rescore
Show 39 more
  1. 2026-06-28 15:49 UTCEG score recompute
  2. 2026-06-28 15:49 UTCGHSA enrichment
  3. 2026-06-28 14:07 UTCEPSS rescore
  4. 2026-06-28 04:56 UTCEPSS rescore
  5. 2026-06-28 04:56 UTCEPSS rescore
  6. 2026-06-27 15:51 UTCEG score recompute
  7. 2026-06-27 15:51 UTCGHSA enrichment
  8. 2026-06-27 03:08 UTCEPSS rescore
  9. 2026-06-26 15:52 UTCEG score recompute
  10. 2026-06-26 15:52 UTCGHSA enrichment
  11. 2026-06-25 15:55 UTCEG score recompute
  12. 2026-06-25 15:55 UTCGHSA enrichment
  13. 2026-06-25 13:49 UTCEPSS rescore
  14. 2026-06-24 15:57 UTCEG score recompute
  15. 2026-06-24 15:57 UTCGHSA enrichment
  16. 2026-06-24 14:05 UTCEPSS rescore
  17. 2026-06-23 21:32 UTCEPSS rescore
  18. 2026-06-23 15:59 UTCEG score recompute
  19. 2026-06-23 15:59 UTCGHSA enrichment
  20. 2026-06-22 16:00 UTCEG score recompute
  21. 2026-06-22 16:00 UTCGHSA enrichment
  22. 2026-06-22 14:25 UTCEPSS rescore
  23. 2026-06-22 14:25 UTCEPSS rescore
  24. 2026-06-21 16:02 UTCEG score recompute
  25. 2026-06-21 16:02 UTCGHSA enrichment
  26. 2026-06-21 14:56 UTCEPSS rescore
  27. 2026-06-21 14:56 UTCEPSS rescore
  28. 2026-06-21 01:59 UTCEPSS rescore
  29. 2026-06-21 01:59 UTCEPSS rescore
  30. 2026-06-20 15:50 UTCEG score recompute
  31. 2026-06-20 15:50 UTCGHSA enrichment
  32. 2026-06-19 19:25 UTCEPSS rescore
  33. 2026-06-19 15:52 UTCEG score recompute
  34. 2026-06-19 15:52 UTCGHSA enrichment
  35. 2026-06-18 17:52 UTCEPSS rescore
  36. 2026-06-18 15:53 UTCEG score recompute
  37. 2026-06-18 15:52 UTCGHSA enrichment
  38. 2026-06-17 15:55 UTCEG score recompute
  39. 2026-06-17 15:52 UTCNVD updatefirst tracked

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 13.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-12528

Explore →

Is Your Infrastructure Affected by CVE-2026-12528?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs