CVE-2026-4359 Heap-buffer-over-read in _mongoc_http_send via strstr on non-null-terminated buffer
A heap-buffer-over-read in the MongoDB C Driver allows attackers to cause application crashes via malformed HTTP responses.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-4359?
CVE-2026-4359 is a low-severity memory corruption vulnerability in MongoDB C Driver, published on 17 Mar 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
A compromised third party cloud server or man-in-the-middle attacker could send a malformed HTTP response and cause a crash in applications using the MongoDB C driver.
Weakness: CWE-158
Which versions are affected by CVE-2026-4359?
It affects 1 product.
Products include Mongodb C Driver.
How do I fix CVE-2026-4359?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-4359 being exploited?
There is no known exploitation of CVE-2026-4359 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-2026-4359, GHSA-3548-98v9-6pq6, JLSEC-2026-182, OESA-2026-1742, OESA-2026-1743, OESA-2026-1744 and 3 more.