Cyber Resilience

CVE-2026-9100

Published
20 May 2026
Modified
23 July 2026
CVSS Score v4 6.0
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0029 22th percentile
Risk Priority 33 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2026-9100 is a medium-severity Improper Validation of Specified Index, Position, or Offset in Input (CWE-1285) vulnerability in Mongodb (inferred from references). Its CVSS base score is 6.0 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 22th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SI-10 (Information Input Validation) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

The MongoDB C Driver's legacy GridFS API accepts malformed file metadata from the database without adequate validation. Crafted documents in a GridFS collection may cause any application that reads those files via the legacy API to either crash (via a…

more

division-by-zero) or silently leak process memory contents (via an out-of-bounds read).

CWE(s)
CWE-1285

Related Threats

MITRE ATT&CK Enterprise Techniques

T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
T1212 Exploitation for Credential Access Credential Access
Adversaries may exploit software vulnerabilities in an attempt to collect credentials.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-20796Shared CWE-1285
CVE-2024-0123Shared CWE-1285
CVE-2025-3755Shared CWE-1285
CVE-2025-2399Shared CWE-1285
CVE-2024-23609Shared CWE-1285
CVE-2025-2633Shared CWE-1285
CVE-2026-12681Shared CWE-1285
CVE-2023-0859Shared CWE-1285
CVE-2025-2634Shared CWE-1285
CVE-2025-7848Shared CWE-1285

Affected Assets

Mongodb
—
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V1.4.2
  • V2.1.1
  • V2.2.1
  • V2.2.2

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match

Requires explicit validation of supplied indices/offsets/positions before they are used to access buffers or other indexable resources.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require input validation, preventing this class of flaw at development time.

ID.RA-01 partial match
prevents

Vulnerability identification processes can discover missing index validation via scanning or reviews.

PR.PS-02 partial match
prevents

Patching and replacement can remediate instances of the weakness after discovery.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect missing or incorrect index validation during development and acceptance.

A.8.25 Secure development life cycle partial match
prevents

Secure development lifecycle includes input validation requirements that can prevent improper index handling.

A.8.26 Application security requirements partial match
prevents

Application security requirements typically mandate bounds checking and validation of offsets/indices.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles include defensive input validation and bounds checking for indexable resources.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly require validation of indices, positions, and offsets before use.

References