MongoDB Atlas SQL ODBC Driver uses ignored SQLBindCol BufferLength as fixed-width row-array stride, causing out-of-bounds writes
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fixed in 3.0.1
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 3.0.1.
- Exploitation?/40Exploitation: unknown (data gap). No CISA SSVC exploitation rating yet
- Exposure3/25Reachable over the network · Data gap: No advisory context yet
- Reach?/20Reach: unknown (data gap). No tracked technology or package matched
- Severity2.1/10CVSS 2.1
- No patch0/5No signal
What would change the score
- Would score about 60 if added to CISA KEV
- Would score about 55 if CISA's SSVC rates exploitation active
- Would score about 24 if advisories confirm default setups are exposed
CVE-2026-120959 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 2.1 (low) and affects Atlas SQL; fixed in 3.0.1.
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- Published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 5/100 · provisional
- Fix
- Fixed in 3.0.1
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The MongoDB Atlas SQL ODBC Driver, which client applications use to query MongoDB Atlas data, is affected. An attacker who can influence the values returned by a query may cause data to be written outside the memory buffer the application provided, potentially corrupting application memory or crashing the client process, though this only occurs when the application requests multiple result rows in a specific way.
Read the original description
A memory-handling flaw in the MongoDB Atlas SQL ODBC Driver can cause values returned for a query to be written outside the bounds of a buffer provided by the calling application. A party able to influence the values a query returns may cause data to be placed at an unintended location in the client application's memory, which may result in unintended modification of that memory or termination of the client process. Reaching this condition depends on a specific, application-chosen way of requesting several result rows at once.
What to do
Upgrade to a fixed version: 3.0.1.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- MongoDB Atlas SQL
From 1.3.0 · fixed in 3.0.1
Evidence 2
- Link
- Link
Corrections
None so far.
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Questions about CVE-2026-120959
Is CVE-2026-120959 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
Which versions are affected by CVE-2026-120959?
Atlas SQL: from 1.3.0 before 3.0.1.Source: cve.now feed data
How do I fix CVE-2026-120959?
Upgrade to a fixed version: 3.0.1.Source: cve.now feed data