Bug 2523232 (CVE-2026-78701)

Summary: CVE-2026-78701 389-ds-base: 389-ds-base: CVE-2026-11610 incomplete fix may introduce a connection-stall DoS
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: aadhikar, bsmejkal, jachapma, mreynolds, progier, rhel-process-autobot, snegrini, spichugi, tbordaz, vashirov, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in 389-ds-base. A remote, authenticated attacker could exploit a vulnerability in the Simple Authentication and Security Layer (SASL) UNBIND process. By sending a specially crafted request, the attacker can cause a connection to stall, leading to resource exhaustion and a Denial of Service (DoS) for the server.
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Bug Depends On: 2523235    
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Description OSIDB Bzimport 2026-08-25 04:56:01 UTC 
Heap buffer overflow in sasl_io_recv() via padded SASL UNBIND fix introduced state bug in that approach. The copy clamps the size, but it does not advance the buffered offset. On the next receive the server waits for another complete N bytes instead of returning the already-buffered remainder (N - len).

Example: a 562-byte UNBIND with the default 512-byte connection buffer returns 512 bytes, then waits for 562 new bytes rather than the remaining 50. A remote SASL-authenticated client can leave the socket open, so the connection stays stalled until the I/O timeout. Repeated connections could be a resource-exhaustion / DoS vector.

CVE-2026-11610 - incomplete fix may introduce a connection-stall DoS
Comment 3 errata-xmlrpc 2026-09-08 05:07:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:64785 https://access.redhat.com/errata/RHSA-2026:64785
Comment 4 errata-xmlrpc 2026-09-08 05:44:38 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:64784 https://access.redhat.com/errata/RHSA-2026:64784