CVE-2026-4358: medium-severity vulnerability in MongoDB Server
Memory safety issues in slot-based execution hash table spill
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.1epss 0.4%
A specially crafted aggregation query with $lookup by an authenticated user with write privileges can cause a double-free or use-after-free memory issue in the slot-based execution (SBE) engine when an in-memory hash table is spilled to disk.
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
Affected products
MongoDB Inc · MongoDB ServerRelated CVEs — MongoDB Server
In the same product, most dangerous first.
CVE-2026-25611HIGHPre-Authentication Memory Exhaustion Denial of Service in MongoDB ServerEPSS 0.9%CVE-2025-0755HIGHMongoDB C Driver bson library may be susceptible to buffer overflowEPSS 0.8%CVE-2024-8305MEDIUMMongoDB Server secondaries may crash due to forced index constraintsEPSS 0.6%CVE-2024-10921MEDIUMImproper neutralization of null bytes may lead to buffer over-reads in MongoDB ServerEPSS 0.6%CVE-2024-3372HIGHMongoDB Server may have unexpected application behaviour due to invalid BSONEPSS 0.5%CVE-2025-6709HIGHPre-Authentication Denial of Service Vulnerability in MongoDB Server's OIDC AuthenticationEPSS 0.5%