Quick answers
- Is CVE-2026-103505 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-103505 being exploited in the wild.
- How severe is CVE-2026-103505?
- High severity, with a CVSS score of 6.5, published 1 October 2026.
- Which products and versions are affected?
- Amazon EFS CSI Driver v3.1.0 to v3.4.2.
- Is there a fix for CVE-2026-103505?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-103505 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-103505?
- Check whether you run Amazon AWS or Amazon EFS CSI Driver at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
Mount option injection via unsanitized mounttargetipmap volumeAttribute in the EFS CSI Driver allows authenticated Kubernetes users with PersistentVolume creation privileges to append comma-separated mount options that are passed directly to the mount utility. Affected versions v3.1.0 through v3.4.2 fail to validate or escape this input, enabling attackers to inject flags like 'ro' or custom options. Fixed in v3.5.0.
Affected products
- Amazon EFS CSI Driver v3.1.0 to v3.4.2
Timeline
- 2026-10-01: disclosed