CVE-2026-11789: Integer Underflow (Wrap or Wraparound) in Red Hat Red Hat Directory Server 11
A flaw was found in 389 Directory Server. The SMD5 password storage plugin performs unsigned integer underflow when computing salt length from a crafted password hash shorter than 16 bytes, causing a buffer over-read that crashes the LDAP server during authentication.
AI Analysis
Technical Summary
This vulnerability in Red Hat Directory Server 11's SMD5 password storage plugin occurs due to an unsigned integer underflow when computing the salt length from a crafted password hash shorter than 16 bytes. The underflow leads to a buffer over-read, which crashes the LDAP server during authentication attempts. The CVSS 3.1 base score is 4.9 (medium severity) with network attack vector, low attack complexity, high privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, and high availability impact.
Potential Impact
The vulnerability causes a denial of service by crashing the LDAP server during authentication. There is no impact on confidentiality or integrity. Exploitation requires high privileges and network access. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-11789 for current remediation guidance. No official fix or workaround is indicated in the provided data. Until a patch is available, restrict access to the LDAP server to trusted users with appropriate privileges to reduce risk.
CVE-2026-11789: Integer Underflow (Wrap or Wraparound) in Red Hat Red Hat Directory Server 11
Description
A flaw was found in 389 Directory Server. The SMD5 password storage plugin performs unsigned integer underflow when computing salt length from a crafted password hash shorter than 16 bytes, causing a buffer over-read that crashes the LDAP server during authentication.
CVSS v3.1
Score 4.9medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in Red Hat Directory Server 11's SMD5 password storage plugin occurs due to an unsigned integer underflow when computing the salt length from a crafted password hash shorter than 16 bytes. The underflow leads to a buffer over-read, which crashes the LDAP server during authentication attempts. The CVSS 3.1 base score is 4.9 (medium severity) with network attack vector, low attack complexity, high privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, and high availability impact.
Potential Impact
The vulnerability causes a denial of service by crashing the LDAP server during authentication. There is no impact on confidentiality or integrity. Exploitation requires high privileges and network access. No known exploits are reported in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-11789 for current remediation guidance. No official fix or workaround is indicated in the provided data. Until a patch is available, restrict access to the LDAP server to trusted users with appropriate privileges to reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-06-09T12:58:52.530Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-11789","vendor":"Red Hat"}]
Threat ID: 6a28145b8dd33fbd85364a2a
Added to database: 06/09/2026, 13:25:47 UTC
Last enriched: 06/30/2026, 21:05:02 UTC
Last updated: 07/31/2026, 19:22:57 UTC
Views: 91
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