CVE-2026-81524 Cross-tenant database retargeting via dot/NUL injection in namespace strings in the C Driver
Attackers can redirect database operations to unintended resources via unsanitized namespace strings, risking unauthorized data access or modification.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-81524?
CVE-2026-81524 is a medium-severity vulnerability in MongoDB C Driver, published on 27 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A weakness in the MongoDB C Driver allows special elements in caller-supplied database and collection name components to pass without sanitization when the driver composes the target namespace for an operation. An application that incorporates untrusted input into these name components can have operations directed at a resource other than the one intended.
Weakness: CWE-99
Which versions are affected by CVE-2026-81524?
It affects 1 product.
Linux distribution packages (1)
mongo-c-driver openSUSE:Tumbleweed | All versions | 2.5.1-1.1 |
Products include Mongodb C Driver.
How do I fix CVE-2026-81524?
Apply the vendor's patch.
Is CVE-2026-81524 being exploited?
There is no known exploitation of CVE-2026-81524 in the wild and no public exploit code.
Other vulnerabilities in MongoDB C Driver
- CVE-2026-93393 Heap overflow via oversized decrypted TLS record sequence in Windows Secure Channel stream
- CVE-2026-6691 MongoDB C Driver Cyrus SASL Canonicalization Buffer Overflow
- CVE-2026-84964 Heap corruption via OCSP request double free from crafted multi-URL certificate in TLS client
- CVE-2024-7553 Accessing Untrusted Directory May Allow Local Privilege Escalation
- CVE-2026-93395 Integer Underflow → Heap Out-of-Bounds Read in `bson_new_from_buffer()
Sources
Also known as DEBIAN-CVE-2026-81524, UBUNTU-CVE-2026-81524, openSUSE-SU-2026:11671-1.