Vulnerability · Published Jul 8, 2026 · Assigned by Go
CVE-2026-39822Root escape via symlink plus trailing slash in os
High 7.8
In plain English
A high-severity security flaw in os from Go standard library. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 14% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.2%top 85.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
On Unix systems, opening a file in an os.Root improperly follows symlinks to locations outside of the Root when the final path component of the a path is a symbolic link and the path ends in /. For example, 'root.Open("symlink/")' will open "symlink" even when "symlink" is a symbolic link pointing outside of the root.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | buildah | 2:1.43.1-4.el10_2 | ALSA-2026:38494 |
| AlmaLinux:9 | buildah | 2:1.43.1-4.el9_8 | ALSA-2026:38493 |
| AlmaLinux:10 | buildah-tests | 2:1.43.1-4.el10_2 | ALSA-2026:38494 |
| AlmaLinux:9 | buildah-tests | 2:1.43.1-4.el9_8 | ALSA-2026:38493 |
| AlmaLinux:8 | delve | 1.26.1-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 |
| AlmaLinux:10 | go-toolset | 1.26.5-1.el10_2.alma.1 | ALSA-2026:37436 |
| AlmaLinux:8 | go-toolset | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 |
| AlmaLinux:9 | go-toolset | 1.26.5-1.el9_8 | ALSA-2026:37435 |
| AlmaLinux:10 | golang | 1.26.5-1.el10_2.alma.1 | ALSA-2026:37436 |
| AlmaLinux:8 | golang | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 |
| AlmaLinux:9 | golang | 1.26.5-1.el9_8 | ALSA-2026:37435 |
| AlmaLinux:10 | golang-bin | 1.26.5-1.el10_2.alma.1 | ALSA-2026:37436 |
| AlmaLinux:8 | golang-bin | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 |
| AlmaLinux:9 | golang-bin | 1.26.5-1.el9_8 | ALSA-2026:37435 |
| AlmaLinux:10 | golang-docs | 1.26.5-1.el10_2.alma.1 | ALSA-2026:37436 |
| AlmaLinux:8 | golang-docs | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 |
| AlmaLinux:9 | golang-docs | 1.26.5-1.el9_8 | ALSA-2026:37435 |
| AlmaLinux:10 | golang-misc | 1.26.5-1.el10_2.alma.1 | ALSA-2026:37436 |
| AlmaLinux:8 | golang-misc | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 |
| AlmaLinux:9 | golang-misc | 1.26.5-1.el9_8 | ALSA-2026:37435 |
| AlmaLinux:10 | golang-race | 1.26.5-1.el10_2.alma.1 | ALSA-2026:37436 |
| AlmaLinux:8 | golang-race | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 |
| AlmaLinux:9 | golang-race | 1.26.5-1.el9_8 | ALSA-2026:37435 |
| AlmaLinux:10 | golang-src | 1.26.5-1.el10_2.alma.1 | ALSA-2026:37436 |
| AlmaLinux:8 | golang-src | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 |
| AlmaLinux:9 | golang-src | 1.26.5-1.el9_8 | ALSA-2026:37435 |
| AlmaLinux:10 | golang-tests | 1.26.5-1.el10_2.alma.1 | ALSA-2026:37436 |
| AlmaLinux:8 | golang-tests | 1.26.5-1.module_el8.10.0+4223+bd807c2e | ALSA-2026:38995 |
| AlmaLinux:9 | golang-tests | 1.26.5-1.el9_8 | ALSA-2026:37435 |
| AlmaLinux:10 | podman | 7:5.8.2-5.el10_2.alma.1 | ALSA-2026:38495 |
| AlmaLinux:9 | podman | 6:5.8.2-5.el9_8 | ALSA-2026:38878 |
| AlmaLinux:10 | podman-docker | 7:5.8.2-5.el10_2.alma.1 | ALSA-2026:38495 |
| AlmaLinux:9 | podman-docker | 6:5.8.2-5.el9_8 | ALSA-2026:38878 |
| AlmaLinux:9 | podman-plugins | 6:5.8.2-5.el9_8 | ALSA-2026:38878 |
| AlmaLinux:10 | podman-remote | 7:5.8.2-5.el10_2.alma.1 | ALSA-2026:38495 |
| AlmaLinux:9 | podman-remote | 6:5.8.2-5.el9_8 | ALSA-2026:38878 |
| AlmaLinux:10 | podman-tests | 7:5.8.2-5.el10_2.alma.1 | ALSA-2026:38495 |
| AlmaLinux:9 | podman-tests | 6:5.8.2-5.el9_8 | ALSA-2026:38878 |
| Alpine:v3.24 | go | 1.26.8-r0 | ALPINE-CVE-2026-39822 |
| Debian:13 | golang-1.24 | no fix listed | DEBIAN-CVE-2026-39822 |
| Debian:14 | golang-1.26 | 1.26.5-1 | DEBIAN-CVE-2026-39822 |
| Debian:14 | golang-1.27 | 1.27~rc2-1 | DEBIAN-CVE-2026-39822 |
| Go | stdlib | 1.25.12, 1.26.5, 1.27.0-rc.2 | GO-2026-4970 |
| Rocky Linux:10 | buildah | 2:1.43.1-4.el10_2 | RLSA-2026:38494 |
| Rocky Linux:9 | buildah | 2:1.43.1-4.el9_8 | RLSA-2026:38493 |
| Rocky Linux:8 | delve | 0:1.26.1-1.module+el8.10.0+40244+e7cb3ff8 | RLSA-2026:38995 |
| Rocky Linux:10 | golang | 0:1.26.5-1.el10_2 | RLSA-2026:37436 |
| Rocky Linux:8 | golang | 0:1.26.5-1.module+el8.10.0+40244+e7cb3ff8 | RLSA-2026:38995 |
| Rocky Linux:9 | golang | 0:1.26.5-1.el9_8 | RLSA-2026:37435 |
| Rocky Linux:10 | podman | 7:5.8.2-5.el10_2 | RLSA-2026:38495 |
| Rocky Linux:9 | podman | 6:5.8.2-5.el9_8 | RLSA-2026:38878 |
| Ubuntu:22.04:LTS | golang-1.17 | no fix listed | UBUNTU-CVE-2026-39822 |
| Ubuntu:22.04:LTS | golang-1.18 | no fix listed | UBUNTU-CVE-2026-39822 |
| Ubuntu:22.04:LTS | golang-1.20 | no fix listed | UBUNTU-CVE-2026-39822 |
| Ubuntu:22.04:LTS | golang-1.21 | no fix listed | UBUNTU-CVE-2026-39822 |
| Ubuntu:24.04:LTS | golang-1.21 | no fix listed | UBUNTU-CVE-2026-39822 |
| Ubuntu:22.04:LTS | golang-1.22 | no fix listed | UBUNTU-CVE-2026-39822 |
| Ubuntu:24.04:LTS | golang-1.22 | no fix listed | UBUNTU-CVE-2026-39822 |
| Ubuntu:22.04:LTS | golang-1.23 | no fix listed | UBUNTU-CVE-2026-39822 |
| Ubuntu:24.04:LTS | golang-1.23 | no fix listed | UBUNTU-CVE-2026-39822 |
| Ubuntu:25.10 | golang-1.23 | no fix listed | UBUNTU-CVE-2026-39822 |
| Ubuntu:26.04:LTS | golang-1.23 | no fix listed | UBUNTU-CVE-2026-39822 |
| Ubuntu:22.04:LTS | golang-1.24 | no fix listed | UBUNTU-CVE-2026-39822 |
| Ubuntu:24.04:LTS | golang-1.24 | no fix listed | UBUNTU-CVE-2026-39822 |
| Ubuntu:25.10 | golang-1.24 | no fix listed | UBUNTU-CVE-2026-39822 |
| Ubuntu:26.04:LTS | golang-1.24 | no fix listed | UBUNTU-CVE-2026-39822 |
| Ubuntu:22.04:LTS | golang-1.25 | no fix listed | UBUNTU-CVE-2026-39822 |
| Ubuntu:24.04:LTS | golang-1.25 | no fix listed | UBUNTU-CVE-2026-39822 |
| Ubuntu:25.10 | golang-1.25 | no fix listed | UBUNTU-CVE-2026-39822 |
| Ubuntu:26.04:LTS | golang-1.25 | no fix listed | UBUNTU-CVE-2026-39822 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Go standard library | os | 0 – before 1.25.121.26.0-0 – before 1.26.51.27.0-0 – before 1.27.0-rc.2 |
Weakness: CWE-61 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H