CVE-2026-103965 Fixed values in MongoDB Server $bucket stage may be misread as field references
Authenticated users with read access may inadvertently view unintended field values due to incorrect handling of constant values in aggregation queries.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-103965?
CVE-2026-103965 is a medium-severity vulnerability in MongoDB Server, published on 13 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
An issue in MongoDB Server's aggregation framework can cause certain constant values to be handled incorrectly during internal query rewriting. Under certain conditions, an authenticated user with read access may receive field values in aggregation output that the query did not intend to return.
Weakness: CWE-94
Which versions are affected by CVE-2026-103965?
How do I fix CVE-2026-103965?
No fix has been published for CVE-2026-103965 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-103965 being exploited?
There is no known exploitation of CVE-2026-103965 in the wild and no public exploit code.
Sources
Also known as GHSA-8w3x-ww8f-273q, UBUNTU-CVE-2026-103965.