{"id":"OESA-2026-2693","summary":"mongo-c-driver security update","details":"mongo-c-driver is a project that includes two libraries: libmongoc, a client library written in C for MongoDB. libbson, a library providing useful routines related to building, parsing, and iterating BSON documents.\r\n\r\nSecurity Fix(es):\n\nThe bson_validate function may return early on specific inputs and incorrectly report success. This behavior could result in skipping validation for BSON data, allowing malformed or invalid UTF-8 sequences to bypass validation and be processed incorrectly. The issue may affect applications that rely on these functions to validate untrusted BSON data before further processing. This issue affects MongoDB C Driver versions prior to 1.30.5, MongoDB C Driver version 2.0.0 and MongoDB C Driver version 2.0.1.(CVE-2026-6231)\n\nThe MongoDB C Driver's Cyrus SASL integration performs unsafe string copying during username canonicalization, enabling a heap buffer overflow before any authentication or network traffic. This may be triggered by passing untrusted input in the username of a MongoDB URI with authMechanism=GSSAPI.(CVE-2026-6691)","modified":"2026-08-18T01:20:05.473234473Z","published":"2026-06-24T11:11:37Z","upstream":["CVE-2026-6231","CVE-2026-6691"],"database_specific":{"severity":"High"},"references":[{"type":"ADVISORY","url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2693"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6231"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6691"}],"affected":[{"package":{"name":"mongo-c-driver","ecosystem":"openEuler:20.03-LTS-SP4","purl":"pkg:rpm/openEuler/mongo-c-driver&distro=openEuler-20.03-LTS-SP4"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.27.4-3.oe2003sp4"}]}],"ecosystem_specific":{"aarch64":["libbson-1.27.4-3.oe2003sp4.aarch64.rpm","libbson-devel-1.27.4-3.oe2003sp4.aarch64.rpm","mongo-c-driver-1.27.4-3.oe2003sp4.aarch64.rpm","mongo-c-driver-debuginfo-1.27.4-3.oe2003sp4.aarch64.rpm","mongo-c-driver-debugsource-1.27.4-3.oe2003sp4.aarch64.rpm","mongo-c-driver-devel-1.27.4-3.oe2003sp4.aarch64.rpm","mongo-c-driver-help-1.27.4-3.oe2003sp4.aarch64.rpm"],"src":["mongo-c-driver-1.27.4-3.oe2003sp4.src.rpm"],"x86_64":["libbson-1.27.4-3.oe2003sp4.x86_64.rpm","libbson-devel-1.27.4-3.oe2003sp4.x86_64.rpm","mongo-c-driver-1.27.4-3.oe2003sp4.x86_64.rpm","mongo-c-driver-debuginfo-1.27.4-3.oe2003sp4.x86_64.rpm","mongo-c-driver-debugsource-1.27.4-3.oe2003sp4.x86_64.rpm","mongo-c-driver-devel-1.27.4-3.oe2003sp4.x86_64.rpm","mongo-c-driver-help-1.27.4-3.oe2003sp4.x86_64.rpm"]},"database_specific":{"source":"https://repo.openeuler.org/security/data/osv/OESA-2026-2693.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}