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Medium, CVSS 6.3

golang.org/x/crypto vulnerable to invoking bypass of certificate restrictions

CVE-2026-39828GHSA-45gg-vh54-h5m9

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (golang.org/x/crypto 0.52.0), 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.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
EPSS
  • CVE-2026-39828: 0.37% estimated exploitation activity in the next 30 days; percentile 30.83 (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.

When an SSH server authentication callback returned PartialSuccessError with non-nil Permissions, those permissions were silently discarded, potentially dropping certificate restrictions such as force-command after a second factor succeeded. Returning non-nil Permissions with PartialSuccessError now results in a connection error.

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

    Published from ghsa record GHSA-45gg-vh54-h5m9

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-2026-39828

Advisory: golang.org/x/crypto vulnerable to invoking bypass of certificate restrictions
IDs: CVE-2026-39828, GHSA-45gg-vh54-h5m9
Record: https://patchnext.com/advisories/cve-2026-39828 (revision 1, source checked 26 Oct 2026, 15:25 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.3)
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/crypto 0.52.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go golang.org/x/crypto: affected < 0.52.0; fixed in 0.52.0

## Suggested inspection (read-only)
- Go golang.org/x/crypto: 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/crypto.
- 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-45gg-vh54-h5m9 (GitHub-reviewed advisory GHSA-45gg-vh54-h5m9 lists affected ranges: Go golang.org/x/crypto >=0 <0.52.0)

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