GHSA-w32m-9786-jp63 — html
GHSA-w32m-9786-jp63 is a CWE-1333 vulnerability in golang.org/x/net/html. A fix is available for golang.org/x/net/html — see the affected versions and patch details below.
Non-linear parsing of case-insensitive content in golang.org/x/net/html
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-w32m-9786-jp63.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Real-World Exposure
golang.org/x/net/htmlReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
An attacker can craft an input to the Parse functions that would be processed non-linearly with respect to its length, resulting in extremely slow parsing. This could cause a denial of service.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | golang.org/x/net/html | all versions | 0.33.0go get golang.org/x/net/html@v0.33.0 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for golang.org/x/net/html, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update golang.org/x/net/html to 0.33.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-w32m-9786-jp63 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-w32m-9786-jp63 can be triaged on real exposure rather than presence alone.
Tailored to GHSA-w32m-9786-jp63. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
This vulnerability is rated as an Important severity because an attacker can craft malicious input that causes the parsing functions to process data non-linearly, resulting in significant delays which leads to a denial of service by exhausting system resources.
| Product | Fixed in | Advisory |
|---|---|---|
| Cryostat 3 on RHEL 8 | cryostat-tech-preview/cryostat-db-rhel8:3.0.1-16 | RHSA-2025:0224 |
| gatekeeper 3.14 for RHEL 9 | gatekeeper/gatekeeper-operator-bundle:v3.14.3-3 | RHSA-2025:1333 |
| gatekeeper 3.15 for RHEL 9 | gatekeeper/gatekeeper-operator-bundle:v3.15.3-2 | RHSA-2025:1332 |
| gatekeeper 3.17 for RHEL 9 | gatekeeper/gatekeeper-operator-bundle:v3.17.1-6 | RHSA-2025:1331 |
| LVMS-4.14-RHEL-9 | lvms4/lvms-must-gather-rhel9:v4.14.12-7 | RHBA-2025:1169 |
| LVMS-4.15-RHEL-9 | lvms4/lvms-must-gather-rhel9:v4.15.10-3 | RHBA-2025:0680 |
| LVMS-4.16-RHEL-9 | lvms4/lvms-must-gather-rhel9:v4.16.7-2 | RHBA-2025:0681 |
| LVMS-4.17-RHEL-9 | lvms4/lvms-must-gather-rhel9:v4.17.4-2 | RHBA-2025:0697 |
Frequently Asked Questions
Is GHSA-w32m-9786-jp63 in your dependencies?
O3 Security finds GHSA-w32m-9786-jp63 across Go dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.