CVE-2026-27139

Description

On Unix platforms, when listing the contents of a directory using File.ReadDir or File.Readdir the returned FileInfo could reference a file outside of the Root in which the File was opened. The impact of this escape is limited to reading metadata provided by lstat from arbitrary locations on the filesystem without permitting reading or writing files outside the root.

CVSS Metrics

• v3.1•LOW•Score: 2.5CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS Trends

Current EPSS score: 0.20%• Percentile: 10%

Techniques & Countermeasures

• CWE-22•Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

  The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Affected Systems

• chainguard•actions-runner-controller

  < 0.13.1-r4

• chainguard•actions-runner-controller-fips

  < 0.13.1-r6

• chainguard•addon-resizer

  < 1.8.23-r14

• chainguard•addon-resizer-fips

  < 1.8.23-r16

• chainguard•age

  < 0

• chainguard•agentbeat

  < 9.2.4-r5

• chainguard•agentbeat-fips

  < 9.2.4-r5

• chainguard•amass

  < 5.0.1-r8

• chainguard•amazon-cloudwatch-agent

  < 1.300064.1-r1

• chainguard•amazon-cloudwatch-agent-amazon-cloudwatch-agent-config-wizard

  < 0

• chainguard•amazon-cloudwatch-agent-amazon-cloudwatch-agent-config-wizard-fips

  < 0

• chainguard•amazon-cloudwatch-agent-config-downloader

  < 0

• chainguard•amazon-cloudwatch-agent-config-downloader-fips

  < 0

• chainguard•amazon-cloudwatch-agent-config-translator

  < 0

• chainguard•amazon-cloudwatch-agent-config-translator-fips

  < 0

• chainguard•amazon-cloudwatch-agent-fips

  < 1.300064.1-r2

• chainguard•amazon-cloudwatch-agent-operator

  < 3.3.2-r1 | < 3.3.2-r0

• chainguard•amazon-cloudwatch-agent-operator-fips

  < 3.3.2-r2

• chainguard•amazon-cloudwatch-agent-start-amazon-cloudwatch-agent

  < 1.300064.1-r1

• chainguard•amazon-cloudwatch-agent-start-amazon-cloudwatch-agent-fips

  < 1.300064.1-r2

• chainguard•amazon-ecs-agent

  < 1.102.0-r2

• chainguard•amazon-ecs-agent-fips

  < 1.102.0-r1 | < 1.102.0-r2

• chainguard•amazon-k8s-cni

  < 1.21.1-r5

• chainguard•amazon-k8s-cni-compat

  < 1.21.1-r5

• chainguard•amazon-k8s-cni-fips

  < 1.21.1-r6

• chainguard•amazon-k8s-cni-init

  < 1.21.1-r5

• chainguard•amazon-k8s-cni-init-compat

  < 1.21.1-r5

• chainguard•amazon-k8s-cni-init-fips

  < 1.21.1-r6

• chainguard•amazon-k8s-cni-init-fips-compat

  < 1.21.1-r6 | < 0

• chainguard•amazon-ssm-agent-ecs-exec-fips

  < 3.3.3270.0-r10

• chainguard•amazon-ssm-agent-fips

  < 3.3.3270.0-r10

• chainguard•apache-beam-java-11-sdk

  < 2.71.0-r3

• chainguard•apache-beam-java-17-sdk

  < 2.71.0-r3

• chainguard•apache-beam-java-21-sdk

  < 2.71.0-r3

• chainguard•apache-exporter

  < 1.0.12-r4

• chainguard•apisix-ingress-controller

  < 2.0.1-r5

• chainguard•apm-server-7.17

  < 7.17.29-r12

• chainguard•apm-server-8.17

  < 8.17.10-r8

• chainguard•apm-server-8.18

  < 8.18.8-r7

• chainguard•apm-server-8.19

  < 8.19.12-r3

• chainguard•apm-server-9.0

  < 9.0.8-r5

• chainguard•apm-server-9.1

  < 9.1.10-r3 | < 9.1.10-r4

• chainguard•apm-server-9.2

  < 9.2.6-r3

• chainguard•apm-server-9.3

  < 9.3.1-r3

• chainguard•apm-server-fips-7.17

  < 7.17.29-r12

• chainguard•apm-server-fips-8.17

  < 8.17.10-r7

• chainguard•apm-server-fips-8.18

  < 8.18.8-r7

• chainguard•apm-server-fips-8.19

  < 8.19.12-r3

• chainguard•apm-server-fips-9.0

  < 9.0.8-r6

• chainguard•apm-server-fips-9.1

  < 9.1.10-r4

Showing first 50 affected entries in server-rendered view.

References (8)

• https://groups.google.com/g/golang-announce/c/EdhZqrQ98hk
• https://go.dev/issue/77827
• https://go.dev/cl/749480
• https://pkg.go.dev/vuln/GO-2026-4602
• https://security-tracker.debian.org/tracker/CVE-2026-27139
• https://pkg.go.dev
• https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27139.json
• https://nvd.nist.gov/vuln/detail/CVE-2026-27139