CVE-2026-11610 (GCVE-0-2026-11610)
Vulnerability from cvelistv5
Published
2026-07-07 09:17
Modified
2026-07-08 21:02
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-122 - Heap-based Buffer Overflow
Summary
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.
References
Impacted products
| Vendor | Product | Version | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 389ds | 389-ds-base |
Version: 1.3.2 ≤ 3.3.0 |
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\"https://access.redhat.com/errata/RHSA-2026:36585\", \"name\": \"RHSA-2026:36585\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:36641\", \"name\": \"RHSA-2026:36641\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:36660\", \"name\": \"RHSA-2026:36660\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:36670\", \"name\": \"RHSA-2026:36670\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:36671\", \"name\": \"RHSA-2026:36671\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/security/cve/CVE-2026-11610\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2484414\", \"name\": \"RHBZ#2484414\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"There is no complete workaround for this flaw.\\nMitigations that reduce exposure:\\n1. Restrict network access to LDAP ports (389/636) to trusted networks only.\\n Note: In FreeIPA/IdM deployments, enrolled clients require LDAP access and\\n this may not be practical.\\n2. If DIGEST-MD5 is not required, disable it via nsslapd-allowed-sasl-mechanisms\\n in cn=config. GSSAPI/Kerberos cannot be disabled in FreeIPA/IdM without breaking\\n domain authentication.\\n3. Monitor for oversized LDAP UNBIND packets (standard UNBIND is 7 bytes; alert on\\n UNBIND packets exceeding ~100 bytes).\\n4. Lowering nsslapd-maxbersize reduces maximum overflow size but does not eliminate\\n the vulnerability.\"}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A heap buffer overflow flaw was found in the SASL I/O layer of 389 Directory Server\\n(389-ds-base). After a successful SASL bind with integrity protection (SSF \u003e 0),\\nan authenticated attacker can send a specially crafted oversized LDAP UNBIND packet\\nthat is copied into a 512-byte heap receive buffer without a bounds check in\\nsasl_io_recv() in sasl_io.c. This allows up to approximately 2 megabytes of\\nattacker-controlled data to overflow the buffer, causing a denial of service (server\\ncrash). In FreeIPA and Red Hat Identity Management deployments, any domain user with\\na valid Kerberos ticket, any enrolled host, or any service account can trigger this\\nvulnerability over the network after authenticating via GSSAPI.\\nThe vulnerable code path has existed since approximately 2013 (389-ds-base 1.3.2) and\\nwas not addressed by the CVE-2025-14905 fix, which patched a separate heap overflow\\nin schema.c only.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-122\", \"description\": \"Heap-based Buffer Overflow\"}]}], \"providerMetadata\": {\"orgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"shortName\": \"redhat\", \"dateUpdated\": \"2026-07-08T13:01:19.304Z\"}, \"x_redhatCweChain\": \"CWE-122: Heap-based Buffer Overflow\"}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-11610\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-08T21:02:28.863Z\", \"dateReserved\": \"2026-06-08T16:13:02.502Z\", \"assignerOrgId\": \"53f830b8-0a3f-465b-8143-3b8a9948e749\", \"datePublished\": \"2026-07-07T09:17:36.519Z\", \"assignerShortName\": \"redhat\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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