{"id":"BIT-mongodb-2026-13077","summary":"Out-of-Bounds Heap Read in BSON CodeWScope Element Parsing via Malformed BSONColumn Data","details":"A missing bounds check in the BSON CodeWScope element accessors allows an attacker to trigger an out-of-bounds heap read via a crafted aggregation pipeline. The vulnerability can be exploited by an authenticated user by generating a malformed BSONColumn data containing a CodeWScope element, bypassing wire-level BSON validation. When the forged element is decompressed, the unchecked size value is used in pointer arithmetic, causing either a server crash or disclosure of adjacent heap memory contents.","aliases":["CVE-2026-13077"],"modified":"2026-09-08T08:48:14.337940352Z","published":"2026-08-19T08:49:30.224Z","database_specific":{"cpes":["cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*"],"severity":"High"},"references":[{"type":"ADVISORY","url":"https://jira.mongodb.org/browse/SERVER-129103"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-13077"}],"affected":[{"package":{"name":"mongodb","ecosystem":"Bitnami","purl":"pkg:bitnami/mongodb"},"ranges":[{"type":"SEMVER","events":[{"introduced":"7.0.0"},{"fixed":"7.0.39"},{"introduced":"8.0.0"},{"fixed":"8.0.28"},{"introduced":"8.2.0"},{"fixed":"8.2.12"},{"introduced":"8.3.0"},{"fixed":"8.3.7"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/mongodb/BIT-mongodb-2026-13077.json"},"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/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"}]}],"schema_version":"1.9.0"}