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  4. CVE 2026 11793 389 ds base 389 ds base stack buffer overflow in
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Back to active CVEs
Medium · CVSS 4.9CVE-2026-11793

389-ds-base: 389-ds-base: stack buffer overflow in checkprefix() algorithm id parsingCVE-2026-11793

Answer in brief

CVE-2026-11793 records a Medium severity (CVSS 4.9) vulnerability in 389-ds-base: 389-ds-base: stack buffer overflow in checkprefix() algorithm id parsing. The current sources do not mark it as known exploited. The current feed maps Red Hat/389-ds-base (generic), Red Hat/redhat-ds:11/389-ds-base (generic), Red Hat/redhat-ds:12/389-ds-base (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 9, 2026Updated Aug 7, 2026Source checked Nov 3, 2026First seen by HOL Jun 30, 2026Material review Aug 7, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.9
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 4.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/389-ds-base (generic), Red Hat/redhat-ds:11/389-ds-base (generic), Red Hat/redhat-ds:12/389-ds-base (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:o:redhat:389_directory_server:-:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/389-ds-basegeneric*Not reported
Red Hat/redhat-ds:11/389-ds-basegeneric*Not reported
Red Hat/redhat-ds:12/389-ds-basegeneric*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/389-ds-base, Red Hat/redhat-ds:11/389-ds-base, Red Hat/redhat-ds:12/389-ds-base.
  2. 2Review the reported fix. Source-reported workaround: Restrict Directory Manager access. Monitor cn=config attributes (nsDS5ReplicaCredentials, nsDS5ReplicaBootstrapCredentials) for abnormally long values. Restrict LDAP administrative access to management networks or localhost (LDAPI).

Evidence timeline and material changes

  1. Published upstream

    Jun 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Aug 7, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Jun 30, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source description

A stack buffer overflow flaw was found in 389 Directory Server. The checkPrefix() function in pw.c copies an attacker-controlled algorithm ID into a 256-byte stack buffer without bounds checking when parsing reversible-encrypted attribute values. An attacker with Directory Manager privileges can crash the LDAP server by storing a crafted credential with an oversized algorithm ID. FORTIFY_SOURCE mitigates this to denial of service only.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Secret Exfiltration
EPSS
Not reported
CWE IDs
CWE-121
Source
CVE List V5
Source checked
Nov 3, 2026
References
2 linked sources
Open source record