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October 14, 2026

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CVE-2019-9636NVD

Vulnerability Summary

Python 2.7.x through 2.7.16 and 3.x through 3.7.2 is affected by: Improper Handling of Unicode Encoding (with an incorrect netloc) during NFKC normalization. The impact is: Information disclosure (credentials, cookies, etc. that are cached against a given hostname). The components are: urllib.parse.urlsplit, urllib.parse.urlparse. The attack vector is: A specially crafted URL could be incorrectly parsed to locate cookies or authentication data and send that information to a different host than when parsed correctly. This is fixed in: v2.7.17, v2.7.17rc1, v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1, v3.5.7, v3.5.8, v3.5.8rc1, v3.5.8rc2, v3.5.9; v3.6.10, v3.6.10rc1, v3.6.11, v3.6.11rc1, v3.6.12, v3.6.9, v3.6.9rc1; v3.7.3, v3.7.3rc1, v3.7.4, v3.7.4rc1, v3.7.4rc2, v3.7.5, v3.7.5rc1, v3.7.6, v3.7.6rc1, v3.7.7, v3.7.7rc1, v3.7.8, v3.7.8rc1, v3.7.9.
Severity Level
CRITICAL(9.8)
Published Date
Mar 8, 2019
Last Modified
Oct 14, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
7.67%Probability
Root Weakness (CWE)
CWE-173: Unknown/Unlisted Weakness ↗
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v3.1 Base Metrics — Score 9.8 (CRITICAL)
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Python Python >= 2.7.0 and < 2.7.17
  • Python Python >= 3.0.0 and < 3.4.10
  • Python Python >= 3.5.0 and < 3.5.7
  • Python Python >= 3.6.0 and < 3.6.9
  • Python Python >= 3.7.0 and < 3.7.3
  • Fedoraproject Fedora
  • Opensuse Leap
  • Debian Debian Linux
  • Canonical Ubuntu Linux
  • Redhat Openshift Container Platform
  • Redhat Enterprise Linux
  • Redhat Enterprise Linux Desktop
  • Redhat Enterprise Linux Eus
  • Redhat Enterprise Linux Server
  • Redhat Enterprise Linux Server Aus
  • Redhat Enterprise Linux Server Eus
  • Redhat Enterprise Linux Server Tus
  • Redhat Enterprise Linux Workstation
  • Redhat Virtualization
  • Oracle Sun Zfs Storage Appliance Kit
Patched Versions
  • Python Python 2.7.17
  • Python Python 3.4.10
  • Python Python 3.5.7
  • Python Python 3.6.9
  • Python Python 3.7.3
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🎁7-Day Free Trial — Try Pro or Team, no card required.
📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
📈EPSS Spike Alerts — Catch rising risk before it peaks.
🎯Custom EPSS/CVSS — Filter noise, focus on risk.
🛡️Exploit Intel — A 2nd confirmed-exploit signal beyond KEV.
🐙GitHub Issues — Auto-tracked, no duplicates.
📬Weekly Digest — One clean summary, not inbox spam.
🏷️Watchlist Groups — Tag alerts by team (Infra/AppSec/SOC).
💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
🚫Ad-Free — Uninterrupted experience.

External References