CVE-2025-47911: GO-2026-4440 - Quadratic parsing complexity in golang.org/x/net/html

CVE-2025-47911 · Severity: low · CVSS 3.1 · Published 2026-02-05

Quadratic parsing complexity in golang.org/x/net/html

Technologies: golang.org/x/net (Go), golang.org/x/net/html (Go). Vendors: Go.

Quick answers

Is CVE-2025-47911 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-47911 being exploited in the wild.
How severe is CVE-2025-47911?
Low severity, with a CVSS score of 3.1, published 5 February 2026.
Which products and versions are affected?
golang.org/x/net (Go) SEMVER:introduced=0,fixed=0.45.0; golang.org/x/net/html (Go) SEMVER:introduced=0,fixed=0.45.0.
Is there a fix for CVE-2025-47911?
Yes. golang.org/x/net (Go): upgrade to 0.45.0 or later; golang.org/x/net/html (Go): upgrade to 0.45.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-47911?
Check whether you run golang.org/x/net (Go) or golang.org/x/net/html (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • golang.org/x/net (Go): upgrade to 0.45.0 or later
    go get golang.org/x/net@v0.45.0
  • golang.org/x/net/html (Go): upgrade to 0.45.0 or later
    go get golang.org/x/net/html@v0.45.0

Affected products

  • golang.org/x/net (Go) SEMVER:introduced=0,fixed=0.45.0
  • golang.org/x/net/html (Go) SEMVER:introduced=0,fixed=0.45.0

Identifiers

  • CVE-2025-47911
  • GHSA-w4gw-w5jq-g9jh
  • GO-2026-4440

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