CVE-2026-10618: Hugo's default fenced-code-block renderer writes attribute values taken from the code-fence info string into t

Routine

MEDIUM 5.4UPGRADE

CVE-2026-10618 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's default fenced-code-block renderer writes attribute values taken from the code-fence info string into the rendered HTML without escaping them. New in markup/internal/attributes/attributes.go converts every attribute value from a byte slice to a string as it is stored, deliberately dropping the escaping that used to happen there, and RenderAttributes in the same file escapes only values that are still byte slices, so its escaping branch is

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	2026-08-24
Last modified	2026-10-12

Publisher (CNA): VulnCheck · Vendor: gohugo

Last updated 2026-10-12 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-24 11:16 UTCPublished CVE record published
2026-10-12 15:10 UTCUpdated Record last modified

gohugo hugo UPGRADE

Affected: >= 0.93.0 and < 0.165.0

Fixed in: 0.165.0

Safe to downgrade to: a release before 0.93.0

1. Check installed version

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

2. UPGRADE to 0.165.0 (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 0.93.0 (Debian / Ubuntu)

apt-cache madison hugo sudo apt install hugo=<VERSION_BEFORE_0.93.0> 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_0.93.0> 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-2026-10618?

hugo: upgrade to 0.165.0. Exact commands for each OS are on this page.

Is CVE-2026-10618 being exploited?

CVE-2026-10618 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-2026-10618 affect?

CVE-2026-10618 affects hugo. Severity is medium (CVSS 5.4). Hugo's default fenced-code-block renderer writes attribute values taken from the code-fence info string into the rendered HTML without escaping them. New in markup/internal/attributes/attributes.go converts every attribute value from a byte

How urgent is CVE-2026-10618?

Priority 25/100. No elevated risk signals yet.

Related CVEs

CVE-2026-44301 HIGH 8.1 UPGRADE Hugo is a static site generator
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

References

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