CVE-2026-58403: Hugo is a static site generator

Routine

MEDIUM 6.5UPGRADE

CVE-2026-58403 is a medium-severity flaw (CVSS 6.5) affecting hugo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Hugo is a static site generator. From v0.123.0 through v0.163.0, Hugo's virtual filesystem is designed so that files under a mount cannot reach outside the mount tree, but a regression caused RootMappingFs.statRoot to call Stat, which follows symlinks, instead of Lstat, so a direct os.ReadFile "somefile" where somefile was a symlink pointing outside the mount would return the target's contents. This effectively let a symlink planted inside a them

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-59
Published	2026-07-06
Last modified	2026-10-25

Publisher (CNA): GitHub, Inc. · Vendor: gohugo

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

Am I affected?

Timeline

2026-07-06 20:16 UTCPublished CVE record published
2026-10-25 20:10 UTCUpdated Record last modified

gohugo hugo UPGRADE

Affected: >= 0.123.0 and < 0.163.1

Fixed in: 0.163.1

Safe to downgrade to: a release before 0.123.0

1. Check installed version

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

2. UPGRADE to 0.163.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade hugo

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 0.123.0 (Debian / Ubuntu)

apt-cache madison hugo sudo apt install hugo=<VERSION_BEFORE_0.123.0> sudo apt-mark hold hugo

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

dnf --showduplicates list hugo sudo dnf downgrade hugo-<VERSION_BEFORE_0.123.0> sudo dnf versionlock add hugo

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.

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-2026-58403?

hugo: upgrade to 0.163.1. Exact commands for each OS are on this page.

Is CVE-2026-58403 being exploited?

CVE-2026-58403 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-2026-58403 affect?

CVE-2026-58403 affects hugo. Severity is medium (CVSS 6.5). Hugo is a static site generator. From v0.123.0 through v0.163.0, Hugo's virtual filesystem is designed so that files under a mount cannot reach outside the mount tree, but a regression caused RootMappingFs.statRoot to call Stat, which follo

How urgent is CVE-2026-58403?

Priority 33/100. No elevated risk signals yet.

Related CVEs

CVE-2026-50134 MEDIUM 5.8 UPGRADE Hugo is a static site generator
CVE-2026-58404 MEDIUM 6.8 UPGRADE Hugo is a static site generator
CVE-2026-50133 MEDIUM 6.1 UPGRADE Hugo is a static site generator
CVE-2026-50135 MEDIUM 5.5 UPGRADE Hugo is a static site generator
CVE-2026-58402 MEDIUM 5.4 UPGRADE Hugo is a static site generator

References

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