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Critical, CVSS 9.8amended

python-jose failure to use a constant time comparison for HMAC keys

CVE-2016-7036GHSA-w799-prg3-cx77

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (python-jose 1.3.2), 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
9.8 · CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
  • CVE-2016-7036: 2.17% estimated exploitation activity in the next 30 days; percentile 82.30 (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.

python-jose before 1.3.2 allows attackers to have unspecified impact by leveraging failure to use a constant time comparison for HMAC keys.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-w799-prg3-cx77

  2. Revision 1 · created ·

    Published from osv record GHSA-w799-prg3-cx77

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-2016-7036

Advisory: python-jose failure to use a constant time comparison for HMAC keys
IDs: CVE-2016-7036, GHSA-w799-prg3-cx77
Record: https://patchnext.com/advisories/cve-2016-7036 (revision 2, source checked 26 Oct 2026, 13:22 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: python-jose 1.3.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI python-jose: affected < 1.3.2; fixed in 1.3.2

## Suggested inspection (read-only)
- `python -m pip show python-jose`: prints the installed version. Run with the environment that serves production active.

## 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 python-jose.
- 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://osv.dev/vulnerability/GHSA-w799-prg3-cx77 (OSV record GHSA-w799-prg3-cx77 lists affected ranges: PyPI python-jose >=0 <1.3.2 (fixed))
- Verified: https://github.com/advisories/GHSA-w799-prg3-cx77 (GitHub-reviewed advisory GHSA-w799-prg3-cx77 lists affected ranges: PyPI python-jose >=0 <1.3.2)

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