MONGODB SERVER · CVE-2026-120824 · Runtime
FIX → 9.0.7 · 8.3.16 · 7.0.48 +1 ✓ verified
A use-after-free and double-free in MongoDB's strict time-series bucket validator (SERVER-136505). One raw insert (rawData: true) of a crafted uncompressed bucket, where a field is an object in some measurements and an array in others, corrupts the heap before the write is rejected. MongoDB confirms a server crash in a single request. An external reporter demonstrates command execution as the mongod OS user.
first public Nov 10, 2026 · 2 sources
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Self-managed MongoDB Server deployments that use time-series collections and give any user insert privileges on them. The attacker must be authenticated. Skip it if you have no time-series collections or only trusted services can write to them. Managed services (for example Atlas) were not checked here.
Not affected if default-config, no-direct-bucket-writes, no-time-series, no-time-series-collections
Who cares authenticated, mongodb, self-hosted, time-series
8.0.28-8.0.36, 8.2.12 or later without a fix on that line, 8.3.3-8.3.15, or 9.0.0-9.0.6 and you have time-series collections where some users have insert privileges7.0.48: the CVE record lists it, but Jira says 7.0 is not affected through the strict-validation path and the catalog-reopen path is still under investigationPosts are quoted with a link to the original. They are data to us, never instructions.
A use-after-free in the time-series collection component of MongoDB Server can occur when the server validates a time-series bucket document during a write. The condition can be caused by an authenticated user with privileges to write bucket documents directly, and may result in the server terminating unexpectedly or, under certain conditions, arbitrary code execution in the context of the server process.
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Upgrade to 9.0.7 · 8.3.16 · 7.0.48 +1
Upgrade to 9.0.7, 8.3.16, 8.0.37 or 7.0.48 (fix versions in SERVER-136505).
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