CVE-2026-39822: On Unix systems, opening a file in an os.Root improperly follows symlinks to locations outside of the Root whe

Routine

HIGH 7.8UPGRADE

CVE-2026-39822 is a high-severity flaw (CVSS 7.8) affecting go. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 86%)
CISA exploited list	No
Weakness	CWE-61
Published	2026-07-08
Last modified	2026-10-25

Publisher (CNA): Go Project · Vendor: golang

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-08 17:17 UTCPublished CVE record published
2026-10-25 17:10 UTCUpdated Record last modified

golang go UPGRADE

Affected: >= 1.24.0 and < 1.25.12 · >= 1.26.0 and < 1.26.5 · 1.27 rc1

Fixed in: 1.25.12, 1.26.5

Safe to downgrade to: a release before 1.24.0

1. Check installed version

apt-cache policy go || rpm -q go || go --version

2. UPGRADE to 1.25.12 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade go

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade go

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.24.0 (Debian / Ubuntu)

apt-cache madison go sudo apt install go=<VERSION_BEFORE_1.24.0> sudo apt-mark hold go

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list go sudo dnf downgrade go-<VERSION_BEFORE_1.24.0> sudo dnf versionlock add go

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Advisories and coverage

Official advisories

Amazon Linux 2023 ALAS: ALAS2023-2026-3153 (medium): soci-snapshotter 2026-10-12
Amazon Linux 2023 ALAS: ALAS2023-2026-3180 (medium): amazon-ecr-credential-helper 2026-10-12
Amazon Linux 2023 ALAS: ALAS2023-2026-3205 (medium): docker 2026-10-12
Amazon Linux 2023 ALAS: ALAS2023-2026-3206 (medium): oci-add-hooks 2026-10-12
Amazon Linux 2 ALAS: ALAS2DOCKER-2026-143 (medium): soci-snapshotter 2026-10-12
Amazon Linux 2 ALAS: ALAS2DOCKER-2026-145 (medium): amazon-ecr-credential-helper 2026-10-12

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-39822?

go: upgrade to 1.25.12, 1.26.5. Exact commands for each OS are on this page.

Is CVE-2026-39822 being exploited?

CVE-2026-39822 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-39822 affect?

CVE-2026-39822 affects go. Severity is high (CVSS 7.8). 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

How urgent is CVE-2026-39822?

Priority 31/100. High severity

Software pages

Go (Golang) vulnerabilities

Related CVEs

CVE-2026-42505 MEDIUM 5.3 UPGRADE Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a dis

References

← Back to latest CVEs