CVE-2026-39822 Root escape via symlink plus trailing slash in os
High 7.8
Published
Updated
Check this codebase for CVE-2026-39822 and fix it if it is affected.
What it is: CVE-2026-39822 is a high-severity path traversal vulnerability in Golang Go, published on 8 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-39822 in the wild and no public exploit code.
Affected packages and fixed versions:
- golang (Bitnami): affected all versions; fixed in 1.25.12, 1.26.5, 1.27.0
- stdlib (Go): affected all versions; fixed in 1.25.12, 1.26.5, 1.27.0-rc.2
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-39822/ (Markdown: https://insights.sbomify.com/CVE-2026-39822/index.md)
Attackers can escape restricted directories in Go applications by exploiting symlink handling with trailing slashes, allowing unauthorized file access.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-39822?
CVE-2026-39822 is a high-severity path traversal vulnerability in Golang Go, published on 8 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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.
Weakness: CWE-61
Which versions are affected by CVE-2026-39822?
2 open source packages ship an affected version, including golang and stdlib. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
golang Bitnami | All versions | 1.25.12, 1.26.5, 1.27.0 |
stdlib Go | All versions | 1.25.12, 1.26.5, 1.27.0-rc.2 |
Linux distribution packages (38)
buildah AlmaLinux:10 | All versions | 2:1.43.1-4.el10_2 |
buildah-tests AlmaLinux:10 | All versions | 2:1.43.1-4.el10_2 |
podman AlmaLinux:10 | All versions | 7:5.8.2-5.el10_2.alma.1 |
podman-docker AlmaLinux:10 | All versions | 7:5.8.2-5.el10_2.alma.1 |
podman-remote AlmaLinux:10 | All versions | 7:5.8.2-5.el10_2.alma.1 |
podman-tests AlmaLinux:10 | All versions | 7:5.8.2-5.el10_2.alma.1 |
buildah AlmaLinux:9 | All versions | 2:1.43.1-4.el9_8 |
buildah-tests AlmaLinux:9 | All versions | 2:1.43.1-4.el9_8 |
podman AlmaLinux:9 | All versions | 6:5.8.2-5.el9_8 |
podman-docker AlmaLinux:9 | All versions | 6:5.8.2-5.el9_8 |
podman-plugins AlmaLinux:9 | All versions | 6:5.8.2-5.el9_8 |
podman-remote AlmaLinux:9 | All versions | 6:5.8.2-5.el9_8 |
podman-tests AlmaLinux:9 | All versions | 6:5.8.2-5.el9_8 |
buildah Red Hat:enterprise_linux:10.2 | All versions | 2:1.43.1-4.el10_2 |
buildah-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 2:1.43.1-4.el10_2 |
buildah-debugsource Red Hat:enterprise_linux:10.2 | All versions | 2:1.43.1-4.el10_2 |
buildah-tests Red Hat:enterprise_linux:10.2 | All versions | 2:1.43.1-4.el10_2 |
buildah-tests-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 2:1.43.1-4.el10_2 |
podman Red Hat:enterprise_linux:10.2 | All versions | 7:5.8.2-5.el10_2 |
podman-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 7:5.8.2-5.el10_2 |
podman-debugsource Red Hat:enterprise_linux:10.2 | All versions | 7:5.8.2-5.el10_2 |
podman-docker Red Hat:enterprise_linux:10.2 | All versions | 7:5.8.2-5.el10_2 |
podman-remote Red Hat:enterprise_linux:10.2 | All versions | 7:5.8.2-5.el10_2 |
podman-remote-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 7:5.8.2-5.el10_2 |
podman-tests Red Hat:enterprise_linux:10.2 | All versions | 7:5.8.2-5.el10_2 |
podman-tests-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 7:5.8.2-5.el10_2 |
buildah Red Hat:enterprise_linux:9::appstream | All versions | 2:1.43.1-4.el9_8 |
buildah-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 2:1.43.1-4.el9_8 |
buildah-debugsource Red Hat:enterprise_linux:9::appstream | All versions | 2:1.43.1-4.el9_8 |
buildah-tests Red Hat:enterprise_linux:9::appstream | All versions | 2:1.43.1-4.el9_8 |
buildah-tests-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 2:1.43.1-4.el9_8 |
podman Red Hat:enterprise_linux:9::appstream | All versions | 6:5.8.2-5.el9_8 |
podman-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 6:5.8.2-5.el9_8 |
podman-debugsource Red Hat:enterprise_linux:9::appstream | All versions | 6:5.8.2-5.el9_8 |
podman-docker Red Hat:enterprise_linux:9::appstream | All versions | 6:5.8.2-5.el9_8 |
podman-plugins Red Hat:enterprise_linux:9::appstream | All versions | 6:5.8.2-5.el9_8 |
podman-plugins-debuginfo Red Hat:enterprise_linux:9::appstream | All versions | 6:5.8.2-5.el9_8 |
podman-remote Red Hat:enterprise_linux:9::appstream | All versions | 6:5.8.2-5.el9_8 |
Products include Golang Go.
How do I fix CVE-2026-39822?
Upgrade golang to a fixed version for your release line: 1.25.12, 1.26.5 or 1.27.0.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-39822 being exploited?
There is no known exploitation of CVE-2026-39822 in the wild and no public exploit code.
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- CVE-2024-24790 Unexpected behavior from Is methods for IPv4-mapped IPv6 addresses in net/netip
- CVE-2023-39320 Arbitrary code execution via go.mod toolchain directive in cmd/go
- CVE-2023-24540 Improper handling of JavaScript whitespace in html/template
Sources
Also known as ALSA-2026:38493, ALSA-2026:38494, ALSA-2026:38495, ALSA-2026:38878, AZL-92303, AZL-92309 and 1812 more.