CVE-2025-47911: The html.Parse function in golang.org/x/net/html has quadratic parsing complexity when processing certain inpu

Q: How do I fix CVE-2025-47911?

html: upgrade to 0.45.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-47911 being exploited?

CVE-2025-47911 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-47911 affect?

CVE-2025-47911 affects html. Severity is medium (CVSS 5.3). The html.Parse function in golang.org/x/net/html has quadratic parsing complexity when processing certain inputs, which can lead to denial of service (DoS) if an attacker provides specially crafted HTML content.

Q: How urgent is CVE-2025-47911?

Priority 35/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2025-47911 is a medium-severity flaw (CVSS 5.3) affecting html. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The html.Parse function in golang.org/x/net/html has quadratic parsing complexity when processing certain inputs, which can lead to denial of service (DoS) if an attacker provides specially crafted HTML content.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Published	2026-02-05
Last modified	2026-06-17

Publisher (CNA): Go Project · Vendor: go

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-05 18:16 UTCPublished CVE record published
2026-06-17 09:28 UTCUpdated Record last modified

go html UPGRADE

Affected: < 0.45.0

Fixed in: 0.45.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.45.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade html

Note

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

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-2025-47911?

html: upgrade to 0.45.0. Exact commands for each OS are on this page.

Is CVE-2025-47911 being exploited?

CVE-2025-47911 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-2025-47911 affect?

CVE-2025-47911 affects html. Severity is medium (CVSS 5.3). The html.Parse function in golang.org/x/net/html has quadratic parsing complexity when processing certain inputs, which can lead to denial of service (DoS) if an attacker provides specially crafted HTML content.

How urgent is CVE-2025-47911?

Priority 35/100. Remotely exploitable, no login, no user action

Software pages

Go (Golang) vulnerabilities

Related CVEs

CVE-2025-58190 MEDIUM 5.3 UPGRADE The html.Parse function in golang.org/x/net/html has an infinite parsing loop when processing certain inputs,

References

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