Authenticated code execution via wrapped SASL length
Published Jun 11, 2026 · Updated Jun 11, 2026
Integer overflow in Red Hat Directory Server allows remote authenticated users to execute code or crash the service through SASL-protected LDAP. The sasl_io_start_packet() function adds four bytes to a 32-bit packet length without checking for wraparound, so 0xFFFFFFFC becomes zero, bypasses nsslapd-maxsasliosize, and drives an approximately 2 MB heap overwrite. Exploitation requires a successful SASL bind with integrity protection; a valid Kerberos-backed domain, host, or service identity is sufficient in FreeIPA deployments.
Summary
What happened
Integer overflow in Red Hat Directory Server allows remote authenticated users to execute code or crash the service through SASL-protected LDAP. The sasl_io_start_packet() function adds four bytes to a 32-bit packet length without checking for wraparound, so 0xFFFFFFFC becomes zero, bypasses nsslapd-maxsasliosize, and drives an approximately 2 MB heap overwrite. Exploitation requires a successful SASL bind with integrity protection; a valid Kerberos-backed domain, host, or service identity is sufficient in FreeIPA deployments.
The record
- CVE
- CVE-2026-11774
- Published
- Jun 11, 2026
- Updated
- Jun 11, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat Directory Server
- Classifications
- CWE-190, T1210
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 11, 2026CVE publishedPublication date reported by the CVE source.
- Jun 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
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Your stack
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