CVE-2026-58402: Hugo is a static site generator

Routine

MEDIUM 5.4UPGRADE

CVE-2026-58402 is a medium-severity flaw (CVSS 5.4) 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 0.60.0 until 0.163.3, Hugo's default code-block renderer wrote the Markdown code-fence language or info-string into the code class="language-…" data-lang="…" wrapper without HTML escaping. A fence info-string containing a quote and a script payload breaks out of the attribute and injects a live script element. This issue is fixed in 0.163.3.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-79
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: >= 0.60.0 and < 0.163.3

Fixed in: 0.163.3

Safe to downgrade to: a release before 0.60.0

1. Check installed version

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

2. UPGRADE to 0.163.3 (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 0.60.0 (Debian / Ubuntu)

apt-cache madison hugo sudo apt install hugo=<VERSION_BEFORE_0.60.0> 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_0.60.0> 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-2026-58402?

hugo: upgrade to 0.163.3. Exact commands for each OS are on this page.

Is CVE-2026-58402 being exploited?

CVE-2026-58402 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-2026-58402 affect?

CVE-2026-58402 affects hugo. Severity is medium (CVSS 5.4). Hugo is a static site generator. From 0.60.0 until 0.163.3, Hugo's default code-block renderer wrote the Markdown code-fence language or info-string into the code class="language-…" data-lang="…" wrapper without HTML escaping. A fence info-

How urgent is CVE-2026-58402?

Priority 25/100. No elevated risk signals yet.

Related CVEs

CVE-2026-50134 MEDIUM 5.8 UPGRADE Hugo is a static site generator
CVE-2026-58403 MEDIUM 6.5 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

References

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