CVE-2026-93393Patch(mongodb / c_driver)

LOWCVSS 9.2 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch mongodb c_driver systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

A heap-based buffer overflow exists in the TLS transport layer of the MongoDB C Driver when built with the Windows platform TLS backend. A remote endpoint that the client connects to can cause the driver to write uncontrolled data outside the bounds of a heap allocation while processing incoming encrypted traffic after the TLS handshake completes. No authentication or user interaction is required, because the affected processing occurs before any application-level authentication completes. Triggering this issue may lead to memory corruption in the client process, disclosure of adjacent heap memory, or termination of the process.

mongodb CVEs Back to dashboard

0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories

https://jira.mongodb.org/browse/CDRIVER-6417

Weakness type (CWE)

CWE-787

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

c_driver

Threat summary

Patch or workaround signal is available
3 mentions across 3 observed days
Momentum state: stable

What's happening

Patch or workaround mentioned in 2 signals
Technical details provided in 3 signals
Disclosure: 1 classified signal
Peaked 2d ago at 1 mentions (2026-09-19); latest day: 1
3 total mentions across 3 days

Affected systems

Vendors

mongodb

Products

c_driver

Deep dive

Activity timeline3 mentions / 3d

Signal classification2 categories

Patch

266.7%

Disclosure

133.3%

Referenced assets1 URL

By indicator

https://www.cve.org/CVERecord?id=CVE-2026-93393

Classification over time

Date	Total	Labels

2026-09-19	1	Disclosure1
2026-09-20	1	Patch1
2026-09-21	1	Patch1

Full discourse3 posts

𝔸𝕟𝕠𝕟𝕪𝕞𝕠𝕦𝕤 ℍ𝕒𝕔𝕜𝕥𝕚𝕧𝕚𝕤𝕥☭⃠🅇@YourAnon_irc43d
Patch
Critical heap-based buffer overflow (CVE-2026-93393) found in MongoDB C Driver's TLS transport. Exploitable remotely pre-auth, risks memory corruption & data disclosure. Patch now! #Cybersecurity #Vulnerability #TLS
Post summary
The post discloses a critical heap-based buffer overflow in MongoDB C Driver's TLS transport, provides technical details, and urges users to patch immediately, though it lacks specific exploit or PoC references.
0000077
16 followersView on X
𝔸𝕟𝕠𝕟𝕪𝕞𝕠𝕦𝕤 ℍ𝕒𝕔𝕜𝕥𝕚𝕧𝕚𝕤𝕥☭⃠🅇@YourAnon_irc44d
Patch
New critical vulns: MongoDB C Driver TLS heap overflow (CVE-2026-93393) & Exim SMTP smuggling (CVE-2026-94057+) emerge in last 2 hrs. Both severely risk data privacy/integrity in transit. Patch NOW! #Cybersecurity #Vulnerabilities #TLS
Post summary
The text announces two critical vulnerabilities (MongoDB C Driver TLS heap overflow and Exim SMTP smuggling) and urges immediate patching, but provides no PoC, exploit tool, or evidence of active exploitation.
0000052
16 followersView on X
Ryan Merck@rmerck46d
Disclosure
Score-chasers will call CVE-2026-93393 a database emergency. Wrong side. Windows SChannel builds of the MongoDB C Driver can heap-overflow on TLS before app auth, so a hostile or redirected peer hits your process. The cluster is not the target. https://www.cve.org/CVERecord?id=CVE-2026-93393
Post summary
The text discloses CVE-2026-93393 and provides technical details of a heap-overflow in Windows SChannel builds of the MongoDB C Driver on TLS before app auth, without mentioning active exploitation, PoC code, exploits, or patches.
0000053
46 followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	mongodb	c_driver	-	mongodb	-

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What researchers are saying

CVE-2026-93393

Ryan Merck[verified]@rmerckDisclosure

The text discloses CVE-2026-93393 and provides technical details of a heap-overflow in Windows SChannel builds of the MongoDB C Driver on TLS before app auth, without mentioning active exploitation, PoC code, exploits, or patches.

𝔸𝕟𝕠𝕟𝕪𝕞𝕠𝕦𝕤 ℍ𝕒𝕔𝕜𝕥𝕚𝕧𝕚𝕤𝕥☭⃠🅇@YourAnon_ircPatch

The post discloses a critical heap-based buffer overflow in MongoDB C Driver's TLS transport, provides technical details, and urges users to patch immediately, though it lacks specific exploit or PoC references.

𝔸𝕟𝕠𝕟𝕪𝕞𝕠𝕦𝕤 ℍ𝕒𝕔𝕜𝕥𝕚𝕧𝕚𝕤𝕥☭⃠🅇@YourAnon_ircPatch

The text announces two critical vulnerabilities (MongoDB C Driver TLS heap overflow and Exim SMTP smuggling) and urges immediate patching, but provides no PoC, exploit tool, or evidence of active exploitation.