{"id":"CVE-2026-6437","aliases":["EUVD-2026-23500","GHSA-mph4-q2vm-w2pw"],"status":"published","title":"AWS EFS CSI Driver Mount Option Injection","description":"Improper neutralization of argument delimiters in the volume handling component in AWS EFS CSI Driver (aws-efs-csi-driver) before v3.0.1 allows remote authenticated users with PersistentVolume creation permissions to inject arbitrary mount options via comma injection.\n\n\n\n\n\n\n\n\nTo remediate this issue, users should upgrade to version v3.0.1","severity":{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:H/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00565,"percentile":0.47206,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-88"],"published":"2026-04-17T18:41:36Z","modified":"2026-10-28T02:31:00Z","fixes":[{"ecosystem":"Go","package":"github.com/kubernetes-sigs/aws-efs-csi-driver","fixed_in":["1.7.8-0.20260416142831-51806c22c575"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/kubernetes-sigs/aws-efs-csi-driver","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.8-0.20260416142831-51806c22c575"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/kubernetes-sigs/aws-efs-csi-driver","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.7.8-0.20260416142831-51806c22c575"}]}]}],"products":[{"vendor":"amazon","product":"aws efs csi driver"},{"vendor":"amazon","product":"efs_csi_driver"}],"references":[{"url":"https://aws.amazon.com/security/security-bulletins/2026-016-aws/","tags":["vendor-advisory","Vendor Advisory","advisory"]},{"url":"https://github.com/kubernetes-sigs/aws-efs-csi-driver/security/advisories/GHSA-mph4-q2vm-w2pw","tags":["third-party-advisory","Vendor Advisory","advisory","web"]},{"url":"https://github.com/kubernetes-sigs/aws-efs-csi-driver/releases/tag/v3.0.1","tags":["patch","Release Notes","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6437","tags":["advisory"]},{"url":"https://github.com/kubernetes-sigs/aws-efs-csi-driver/commit/51806c22c5754bfbdeca6910f15571a07921b784","tags":["web"]},{"url":"https://aws.amazon.com/security/security-bulletins/2026-016-aws","tags":["web"]},{"url":"https://github.com/advisories/GHSA-mph4-q2vm-w2pw"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6437.json","tags":["advisory"]},{"url":"https://github.com/kubernetes-sigs/aws-efs-csi-driver","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-6437","title":"AWS EFS CSI Driver Mount Option Injection","description":"Improper neutralization of argument delimiters in the volume handling component in AWS EFS CSI Driver (aws-efs-csi-driver) before v3.0.1 allows remote authenticated users with PersistentVolume creation permissions to inject arbitrary mount options via comma injection.\n\n\n\n\n\n\n\n\nTo remediate this issue, users should upgrade to version v3.0.1","status":"published","published":"2026-04-17T18:41:36.075Z","modified":"2026-10-20T18:20:23.843Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:H/SI:N/SA:N","level":"medium","assessor":"cna"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-88"],"updated_at":"2026-11-02T13:49:53.818886Z"}],"euvd":[{"id":"EUVD-2026-23500","description":"Improper neutralization of argument delimiters in the volume handling component in AWS EFS CSI Driver (aws-efs-csi-driver) before v3.0.1 allows remote authenticated users with PersistentVolume creation permissions to inject arbitrary mount options via comma injection.\n\n\n\n\n\n\n\n\nTo remediate this issue, users should upgrade to version v3.0.1","status":"published","published":"2026-04-17T18:41:36Z","modified":"2026-10-20T18:20:23Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:H/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T16:59:43.145678Z"}],"ghsa":[{"id":"GHSA-mph4-q2vm-w2pw","title":"Amazon EFS CSI Driver has mount option injection via unsanitized volumeHandle and mounttargetip fields","description":"### Summary\nThe Amazon EFS CSI Driver is a Container Storage Interface driver that allows Kubernetes clusters to use Amazon Elastic File System. An issue exists where, under certain circumstances, unsanitized values in the volumeHandle and mounttargetip fields are passed directly to the mount command, allowing injection of arbitrary mount options.\n\n### Impact\nAn actor with PersistentVolume creation privileges can inject arbitrary mount options by appending comma-separated values to the Access Point ID in volumeHandle or to the mounttargetip volumeAttribute. The mount utility parses comma-separated values as separate options, causing the injected options to be applied to the filesystem mount without authorization.\n\nImpacted versions: \u003c= v3.0.0\n\n### Patches\nThis issue has been addressed in Amazon EFS CSI Driver version v3.0.1. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.\n\n### Workarounds\nRestrict PersistentVolume and StorageClass creation to cluster administrators using Kubernetes RBAC, preventing untrusted users from supplying arbitrary field values.\n\n### References\nIf you have any questions or comments about this advisory, we ask that you contact AWS Security via our vulnerability reporting page or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com).  Please do not create a public GitHub issue.\n\n### Acknowledgement\nWe would like to thank Shaul Ben-Hai from Sentinel One for collaborating on this issue through the coordinated vulnerability disclosure process.","status":"published","published":"2026-04-18T01:07:27Z","modified":"2026-04-18T01:07:28Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:H/SI:N/SA:N","level":"medium"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","level":"medium"}],"cwes":["CWE-88"],"updated_at":"2026-11-02T14:39:55.105822Z"}],"nvd":[{"id":"CVE-2026-6437","description":"Improper neutralization of argument delimiters in the volume handling component in AWS EFS CSI Driver (aws-efs-csi-driver) before v3.0.1 allows remote authenticated users with PersistentVolume creation permissions to inject arbitrary mount options via comma injection.\n\n\n\n\n\n\n\n\nTo remediate this issue, users should upgrade to version v3.0.1","status":"published","published":"2026-04-17T19:16:40.15Z","modified":"2026-10-26T22:10:00.163Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:H/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","level":"medium","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-88"],"updated_at":"2026-11-02T14:12:15.120927Z"}],"osv":[{"id":"CVE-2026-6437","title":"AWS EFS CSI Driver Mount Option Injection","description":"Improper neutralization of argument delimiters in the volume handling component in AWS EFS CSI Driver (aws-efs-csi-driver) before v3.0.1 allows remote authenticated users with PersistentVolume creation permissions to inject arbitrary mount options via comma injection.\n\n\n\n\n\n\n\n\nTo remediate this issue, users should upgrade to version v3.0.1","status":"published","published":"2026-04-17T18:41:36.075Z","modified":"2026-10-28T02:31:00.039093098Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:H/SI:N/SA:N","level":"medium"}],"cwes":["CWE-88"],"updated_at":"2026-11-02T15:45:14.096824Z"},{"id":"GHSA-mph4-q2vm-w2pw","title":"Amazon EFS CSI Driver has mount option injection via unsanitized volumeHandle and mounttargetip fields","description":"### Summary\nThe Amazon EFS CSI Driver is a Container Storage Interface driver that allows Kubernetes clusters to use Amazon Elastic File System. An issue exists where, under certain circumstances, unsanitized values in the volumeHandle and mounttargetip fields are passed directly to the mount command, allowing injection of arbitrary mount options.\n\n### Impact\nAn actor with PersistentVolume creation privileges can inject arbitrary mount options by appending comma-separated values to the Access Point ID in volumeHandle or to the mounttargetip volumeAttribute. The mount utility parses comma-separated values as separate options, causing the injected options to be applied to the filesystem mount without authorization.\n\nImpacted versions: \u003c= v3.0.0\n\n### Patches\nThis issue has been addressed in Amazon EFS CSI Driver version v3.0.1. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes.\n\n### Workarounds\nRestrict PersistentVolume and StorageClass creation to cluster administrators using Kubernetes RBAC, preventing untrusted users from supplying arbitrary field values.\n\n### References\nIf you have any questions or comments about this advisory, we ask that you contact AWS Security via our vulnerability reporting page or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com).  Please do not create a public GitHub issue.\n\n### Acknowledgement\nWe would like to thank Shaul Ben-Hai from Sentinel One for collaborating on this issue through the coordinated vulnerability disclosure process.","status":"published","published":"2026-04-18T01:07:27Z","modified":"2026-04-18T01:26:25.918829Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N","level":"medium"},{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:H/VA:N/SC:H/SI:N/SA:N","level":"medium"}],"cwes":["CWE-88"],"updated_at":"2026-11-02T15:46:52.170928Z"}]}}