Vulnerability · Published Oct 1, 2026 · Assigned by AMZN

CVE-2026-103505AWS EFS CSI Driver Mount Option Injection via mounttargetipmap

Medium 6.5

In plain English

A medium-severity argument injection in aws-efs-csi-driver from AWS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 62.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Improper neutralization of argument delimiters in the volume handling component in AWS EFS CSI Driver (aws-efs-csi-driver) v3.1.0 through v3.4.2 might allow remote authenticated users with PersistentVolume creation permissions to inject arbitrary mount options via comma-separated values in the mounttargetipmap volumeAttribute. To remediate this issue, users should upgrade to version v3.5.0 or later.

Affected products (as reported)

Vendor	Product	Versions
AWS	aws-efs-csi-driver	3.1.0 – through 3.4.2

Weakness: CWE-88 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

References

https://github.com/kubernetes-sigs/aws-efs-csi-driver/releases/tag/v3.5.0 patch
https://aws.amazon.com/security/security-bulletins/2026-120-aws/ vendor-advisory
https://github.com/kubernetes-sigs/aws-efs-csi-driver/security/advisories/GHSA-pv26-6q9q-5773 third-party-advisory