Authenticated server crash via oversized SASL UNBIND
Published Jul 7, 2026 · Updated Jul 7, 2026
Heap buffer overflow in the SASL I/O layer of 389 Directory Server allows remote authenticated users to crash the LDAP server. In sasl_io_recv() in sasl_io.c, the unencrypted receive path copies a padded LDAP UNBIND packet into a 512-byte heap buffer without checking its length. A successful SASL bind with integrity protection is required; a Kerberos-authenticated domain user, host, or service account can trigger the crash.
Summary
What happened
Heap buffer overflow in the SASL I/O layer of 389 Directory Server allows remote authenticated users to crash the LDAP server. In sasl_io_recv() in sasl_io.c, the unencrypted receive path copies a padded LDAP UNBIND packet into a 512-byte heap buffer without checking its length. A successful SASL bind with integrity protection is required; a Kerberos-authenticated domain user, host, or service account can trigger the crash.
The record
- CVE
- CVE-2026-11610
- Published
- Jul 7, 2026
- Updated
- Jul 7, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat Enterprise Linux Extended Lifecycle Support
- Classifications
- CWE-122, T1489
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 7, 2026CVE publishedPublication date reported by the CVE source.
- Jul 7, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
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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Public exploit references
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Technologies
Your stack
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Your stack
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