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CVE-2026-11790 Red Hat CVE debrief

CVE-2026-11790 is a medium-severity vulnerability in 389 Directory Server's PBKDF2-SHA256 password storage plugin. The plugin fails to enforce an upper bound on the iteration count extracted from stored password hashes, allowing a privileged attacker to cause excessive CPU consumption during authentication, resulting in denial of service. The vulnerability was published on [cvePublishedAt] and modified on [cveModifiedAt].

Vendor
Red Hat
Product
Red Hat Directory Server 11
CVSS
MEDIUM 4.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-30
Advisory published
2026-06-09
Advisory updated
2026-06-30

Who should care

Users of Red Hat Directory Server, 389 Directory Server, and related Red Hat Enterprise Linux versions should be aware of this vulnerability.

Technical summary

The PBKDF2-SHA256 password storage plugin in 389 Directory Server does not enforce an upper bound on the iteration count extracted from stored password hashes. This allows a privileged attacker who can modify a user's password hash to cause excessive CPU consumption during authentication, resulting in denial of service.

Defensive priority

medium

Recommended defensive actions

  • Apply patches or updates provided by Red Hat to address the vulnerability.
  • Restrict access to privileged users who can modify password hashes.
  • Monitor authentication attempts and system resources for signs of potential abuse.

Evidence notes

The CVE-2026-11790 vulnerability was published on [cvePublishedAt] and modified on [cveModifiedAt]. The vulnerability affects multiple versions of Red Hat Directory Server and Enterprise Linux.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-11790 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-11790

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-11790 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-11790

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.