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Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process. A flaw was found in the SASL I/O layer of 389 Directory Server (389-ds-base). In sasl_io_start_packet(), the 4-byte wrapped-record length read from the wire is validated only against an upper bound (the check added for CVE-2026-11774). When a SASL-authenticated attacker sends a wrapped record with a wire length of 0 (or 1 or 2), the resulting encrypted_buffer_count (4, 5, or 6 after adding sizeof(uint32_t)) is less than encrypted_buffer_offset (7, the header bytes already consumed). The unsigned subtraction in sasl_io_read_packet() then underflows to approximately 0xFFFFFFFD, and PR_Recv is requested to read roughly 4 GiB into the 1024-byte encrypted_buffer allocated in sasl_io_init_buffers(). This causes a heap buffer overflow with attacker-controlled length and content. The vulnerability requires authentication via a SASL bind with integrity protection (SSF > 0). This is a distinct defect from CVE-2026-11774, which only guards against lengths near UINT32_MAX; the lower-end case is not covered and the vulnerability persists at HEAD.
Fixed in https://github.com/389ds/389-ds-base/commit/82476f968
FEDORA-2026-b16c9cbc0f (389-ds-base-3.2.3-2.fc44) has been submitted as an update to Fedora 44. https://bodhi.fedoraproject.org/updates/FEDORA-2026-b16c9cbc0f
FEDORA-2026-c1e25a4642 has been pushed to the Fedora 45 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-c1e25a4642` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-c1e25a4642 See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-2026-b16c9cbc0f has been pushed to the Fedora 44 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-b16c9cbc0f` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-b16c9cbc0f See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-2026-0b8bc362b1 has been pushed to the Fedora 43 testing repository. Soon you'll be able to install the update with the following command: `sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-0b8bc362b1` You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-0b8bc362b1 See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.
FEDORA-2026-c1e25a4642 (389-ds-base-3.3.1-3.fc45) has been pushed to the Fedora 45 stable repository. If problem still persists, please make note of it in this bug report.
FEDORA-2026-0b8bc362b1 (389-ds-base-3.1.5-4.fc43) has been pushed to the Fedora 43 stable repository. If problem still persists, please make note of it in this bug report.
FEDORA-2026-b16c9cbc0f (389-ds-base-3.2.3-5.fc44) has been pushed to the Fedora 44 stable repository. If problem still persists, please make note of it in this bug report.