Authenticated denial of service via stalled SASL UNBIND
Published Aug 25, 2026 · Updated Aug 25, 2026
Denial of service in 389-ds-base allows remote authenticated users to stall Directory Server connections with a crafted SASL UNBIND request. The sasl_io_recv() path clamps a copy to the caller buffer but fails to advance the buffered offset, so the next receive waits for the full original length instead of the remainder. A SASL-authenticated client can hold repeated sockets open until the I/O timeout, exhausting connection resources and interrupting directory service availability.
Summary
What happened
Denial of service in 389-ds-base allows remote authenticated users to stall Directory Server connections with a crafted SASL UNBIND request. The sasl_io_recv() path clamps a copy to the caller buffer but fails to advance the buffered offset, so the next receive waits for the full original length instead of the remainder. A SASL-authenticated client can hold repeated sockets open until the I/O timeout, exhausting connection resources and interrupting directory service availability.
The record
- CVE
- CVE-2026-78701
- Published
- Aug 25, 2026
- Updated
- Aug 25, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat Enterprise Linux 6
- Classifications
- CWE-787, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 25, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
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Technologies
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Your stack
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