CVE-2026-11610

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After a successful SASL bind with integrity protection (SSF > 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."}], "affected": [{"vendor": "389ds", "product": "389-ds-base", "versions": [{"status": "affected", "version": "1.3.2", "versionType": "semver", "lessThanOrEqual": "3.3.0"}], "packageName": "389-ds-base", "collectionURL": "https://github.com/389ds/389-ds-base", "defaultStatus": "unaffected"}, {"vendor": "Red Hat", "product": "Red Hat Directory Server 11.5 E4S for RHEL 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "redhat-ds:11", "defaultStatus": "affected", "versions": [{"version": "8060020260702180044.0ca98e7e", 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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."}], "timeline": [{"lang": "en", "time": "2026-04-22T00:00:00.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-07-07T09:00:00.000Z", "value": "Made public."}], "credits": [{"lang": "en", "value": "This issue was discovered by Ian Murphy (Red Hat)."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-11-04T21:50:54.575Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-08T21:02:20.457715Z", "id": "CVE-2026-11610", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-08T21:02:28.863Z"}}]}}

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"references": [{"url": "https://access.redhat.com/errata/RHSA-2026:36195", "name": "RHSA-2026:36195", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:36196", "name": "RHSA-2026:36196", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:36197", "name": "RHSA-2026:36197", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:36198", "name": "RHSA-2026:36198", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:36200", "name": "RHSA-2026:36200", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:36201", "name": "RHSA-2026:36201", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:36202", "name": "RHSA-2026:36202", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": 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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). 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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": "2026-11-04T21:50:54.575Z"}, "x_redhatCweChain": "CWE-122: Heap-based Buffer Overflow"}}, "cveMetadata": {"cveId": "CVE-2026-11610", "state": "PUBLISHED", "dateUpdated": "2026-11-04T21:50:54.575Z", "dateReserved": "2026-06-08T16:13:02.502Z", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "datePublished": "2026-07-07T09:17:36.519Z", "assignerShortName": "redhat"}, "dataVersion": "5.2"}

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After a successful SASL bind with integrity protection (SSF > 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."}], "id": "CVE-2026-11610", "lastModified": "2026-11-04T22:17:52.087", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-11610", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-07-08T21:02:20.457715Z", "version": "2.0.3"}}]}, "published": "2026-07-07T10:16:39.690", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:36195"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:36196"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:36197"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:36198"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:36200"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:36201"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:36202"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:36204"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:36205"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:36206"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:36208"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:36209"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:36585"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:36641"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:36660"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:36670"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:36671"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2026-11610"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2484414"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "This issue was discovered by Ian Murphy (Red Hat).", "bugzilla": {"description": "389-ds-base: 389-ds-base: Heap buffer overflow in sasl_io_recv() via padded SASL UNBIND", "id": "2484414", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2484414"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-122", "details": ["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 > 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."], "mitigation": {"lang": "en:us", "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.\nNote: In FreeIPA/IdM deployments, enrolled clients require LDAP access and\nthis may not be practical.\n2. If DIGEST-MD5 is not required, disable it via nsslapd-allowed-sasl-mechanisms\nin cn=config. GSSAPI/Kerberos cannot be disabled in FreeIPA/IdM without breaking\ndomain authentication.\n3. Monitor for oversized LDAP UNBIND packets (standard UNBIND is 7 bytes; alert on\nUNBIND packets exceeding ~100 bytes).\n4. Lowering nsslapd-maxbersize reduces maximum overflow size but does not eliminate\nthe vulnerability."}, "name": "CVE-2026-11610", "package_state": [{"cpe": "cpe:/a:redhat:directory_server:11", "fix_state": "Affected", "package_name": "redhat-ds:11/389-ds-base", "product_name": "Red Hat Directory Server 11"}, {"cpe": "cpe:/a:redhat:directory_server:12", "fix_state": "Affected", "package_name": "redhat-ds:12/389-ds-base", "product_name": "Red Hat Directory Server 12"}, {"cpe": "cpe:/a:redhat:directory_server:13", "fix_state": "Not affected", "package_name": "389-ds-base", "product_name": "Red Hat Directory Server 13"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "389-ds-base", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Will not fix", "package_name": "389-ds-base", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "389-ds-base", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "389-ds-base", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "389-ds-base", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-07T09:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-11610\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-11610"], "statement": "Red Hat rates this issue as Important impact. After a successful SASL bind with integrity protection (SSF > 0), an authenticated remote attacker can send a crafted oversized LDAP UNBIND packet that is copied into a 512-byte heap receive buffer without a bounds check in sasl_io_recv(). Up to roughly two megabytes of attacker-controlled data can overflow the buffer, reliably crashing ns-slapd on production builds. Exploitation requires a valid SASL-authenticated LDAP session, not Directory Manager access. Any user who can bind with SASL mechanisms such as GSSAPI/Kerberos or DIGEST-MD5 can trigger the denial of service. In deployments where domain users, enrolled hosts, and service accounts routinely authenticate to the directory over Kerberos, the attack surface includes any such principal with network access to LDAP. This flaw is independent of CVE-2025-14905, which patched a separate heap overflow in schema.c and did not modify sasl_io.c.", "threat_severity": "Important"}

{"created": "2026-07-07T16:45:03.623601+00:00", "updated": "2026-07-31T14:30:04.223082+00:00", "vendors": []}