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Highest advisory severityHigh 1 vendor · 2 advisories

CVE-2026-11610

CVE-2026-11610: 2 tracked advisory records across Red Hat. Compare vendor sources and published fix guidance.

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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Vendor advisory comparison

Red Hat

2 advisories
  • Advisory severityHigh8.8

    High [CVE-2026-11610] Heap buffer overflow in sasl_io_recv via padded SASL UNBIND

    CVE-2026-11610Source published Source updated

    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. Red Hat rates this issue as Important impact. Exploitation requires a valid…

    Affected products in this advisory
    • Red Hat Directory Server 11.5 E4S for RHEL 8
    • Red Hat Directory Server 11.7 E4S for RHEL 8
    • Red Hat Directory Server 11.9 for RHEL 8
    • Red Hat Directory Server 12.2 E4S for RHEL 9

    15 more entries in the full advisory.

    Source-reported affected versions
    • 1.3.2
    Source-reported fixed versions
    • redhat-ds:11-8060020260702180044.0ca98e7e
    • redhat-ds:11-8080020260702180836.f969626e
    • redhat-ds:11-8100020260702145313.37ed7c03
    • redhat-ds:12-9020020260703060155.1674d574

    30 more entries in the full advisory.

    Mitigation guidance
    • There is no complete workaround for this flaw. Mitigations that reduce exposure: 1. Restrict network access to LDAP ports (389/636) to trusted networks only. Note: In FreeIPA/IdM deployments, enrolled clients require LDAP access and this may not be practical. 2. If DIGEST-MD5 is not required, disable it via nsslapd-allowed-sasl-mechanisms in cn=config. GSSAPI/Kerberos cannot be disabled in FreeIPA/IdM without breaking domain authentication. 3. Monitor for oversized LDAP UNBIND packets (standard UNBIND is 7 bytes; alert on UNBIND packets exceeding ~100 bytes). 4. Lowering nsslapd-maxbersize reduces maximum overflow size but does not eliminate the vulnerability.
    Full advisory and evidenceOpen source bulletin
  • Advisory severityMedium6.5

    Medium [CVE-2026-11610 +1] incomplete fix may introduce a connection-stall DoS

    CVE-2026-78701Source published Source updated

    This bulletin covers 2 CVEs. The products, versions, score and guidance below describe the bulletin; check its source for applicability to this specific CVE.

    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. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-787. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9; Red Hat Directory Server 13.2; Red Hat Directory Server 11; Red Hat Directory Server 12; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8. Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat fixing advisory: RHSA-2026:64785…

    Affected products in this advisory
    • Red Hat Enterprise Linux 10
    • Red Hat Enterprise Linux 9
    • Red Hat Directory Server 13.2
    • Red Hat Directory Server 11

    5 more entries in the full advisory.

    Source-reported affected versions
    Affected-version details not available in this record.
    Source-reported fixed versions
    • 389-ds-base-0:3.2.0-10.el10_2
    • 389-ds-base-0:2.8.0-10.el9_8
    • dirsrv/dirsrv-container-rhel10:1788851765
    • RHSA-2026:64785

    2 more entries in the full advisory.

    Mitigation guidance
    • To mitigate this issue, restrict network access to the 389-ds-base service to only trusted clients and networks. This can be achieved by configuring firewall rules to limit inbound connections to the LDAP ports (typically 389 for LDAP and 636 for LDAPS) to known, authorized IP addresses or subnets. Example using `firewalld`: ```bash # firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<TRUSTED_IP_OR_SUBNET>" port port="389" protocol="tcp" accept' # firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<TRUSTED_IP_OR_SUBNET>" port port="636" protocol="tcp" accept' # firewall-cmd --reload ``` Replace `<TRUSTED_IP_OR_SUBNET>` with the actual IP addresses or network ranges of your trusted clients. This action may impact legitimate clients if not configured correctly. A service restart is not required for firewall changes to take effect.
    Full advisory and evidenceOpen source bulletin

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