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🐹 Go
Not in CISA KEV
HIGH severity

CVE-2018-17846 — x/net

HIGH

CVE-2018-17846 is a high-severity (CVSS 7.5) CWE-835 vulnerability in golang.org/x/net. A fix is available for golang.org/x/net — see the affected versions and patch details below.

x/net/html Vulnerable to DoS During HTML Parsing

Also known asGO-2020-0014
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs85th percentile — riskier than 85% of all scored CVEsHighest risk
0.06%1.11%2.16%3.21%0.7%2.5%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐹golang.org/x/net

Real-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

The html package (aka x/net/html) through 2018-09-25 in Go mishandles <table><math><select><mi><select></table>, leading to an infinite loop during an html.Parse call because inSelectIM and inSelectInTableIM do not comply with a specification.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogolang.org/x/netall versions0.0.0-20190125091013-d26f9f9a57f3go get golang.org/x/net@v0.0.0-20190125091013-d26f9f9a57f3

Affected Products

2 products · 3 configurations
OS
fedorafedoraproject
2 versions
2829
Application
netgolang
≤ 2018-09-25
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for golang.org/x/net, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update golang.org/x/net to 0.0.0-20190125091013-d26f9f9a57f3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-17846 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

The html package (aka x/net/html) through 2018-09-25 in Go mishandles `<table><math><select><mi><select></table>`, leading to an infinite loop during an `html.Parse` call because `inSelectIM` and `inSelectInTableIM` do not comply with a specification.
O3 Security · Impact-Aware SCA

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CVE-2018-17846: x/net — Fix Available