Skip to content
Patch Next
Sign inAdd to your agent

← Actionable
High, CVSS 7.5

golang.org/x/net/html has Improper Restriction of Operations within the Bounds of a Memory Buffer

CVE-2018-17143GHSA-fcf9-6fv2-fc5v

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (golang.org/x/net 0.0.0-20180921000356-2f5d2388922f), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

Add to your agent

Affected packages

  • Go golang.org/x/net

    Affected
    < 0.0.0-20180921000356-2f5d2388922f
    Fixed in
    0.0.0-20180921000356-2f5d2388922f

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2018-17143: 2.77% estimated exploitation activity in the next 30 days; percentile 86.35 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

The html package (aka x/net/html) through 2018-09-17 in Go mishandles <template<tBody<isindex/action=0, leading to a "panic: runtime error" in inBodyIM in parse.go during an html.Parse call

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-fcf9-6fv2-fc5v

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2018-17143

Advisory: golang.org/x/net/html has Improper Restriction of Operations within the Bounds of a Memory Buffer
IDs: CVE-2018-17143, GHSA-fcf9-6fv2-fc5v
Record: https://patchnext.com/advisories/cve-2018-17143 (revision 1, source checked 26 Oct 2026, 15:04 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: golang.org/x/net 0.0.0-20180921000356-2f5d2388922f. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go golang.org/x/net: affected < 0.0.0-20180921000356-2f5d2388922f; fixed in 0.0.0-20180921000356-2f5d2388922f

## Suggested inspection (read-only)
- Go golang.org/x/net: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on golang.org/x/net.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-fcf9-6fv2-fc5v (GitHub-reviewed advisory GHSA-fcf9-6fv2-fc5v lists affected ranges: Go golang.org/x/net >=0 <0.0.0-20180921000356-2f5d2388922f)

Commands are suggestions: review each one before running it.

Loading voting…