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Vulnerabilities/CVE-2019-9636Public Intelligence Dossier
Source: python · Limited verification•Last verified: •Collection Degraded
CVE-2019-9636Unknown / EvaluatingCRITICAL (raw)CVSS 9.8NVD-CWE-noinfo

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

Published: 09 Mar 2019•Last updated: 14 Oct 2026, 12:46 PM IST•Source identifier: cve@mitre.org
Dossier completeness: source-provided sections 2 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
9.8CRITICAL (raw)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Metric sourcenvd@nist.gov
EPSS probability
7.7%0.077
Percentile95th
Weakness type
NVD-CWE-noinfo
CWE-173
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

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.

SOC priority

High Severity / Review

Actively exploited

Unknown

Publicly disclosed

Unknown

Risk basis: SOC ecosystem technology relevance; CRITICAL severity; Critical CVSS without confirmed KEV exploitation

Affected Products & Remediation

16 source-backed products
Affected products and versions (source)
  • python python · >= 2.7.0 < 2.7.17; >= 3.0.0 < 3.4.10; >= 3.5.0 < 3.5.7; >= 3.6.0 < 3.6.9; >= 3.7.0 < 3.7.3 · NVD CPE · Source
  • fedoraproject fedora · 28; 29; 30; 31 · NVD CPE · Source
  • opensuse leap · 15.0; 15.1; 42.3 · NVD CPE · Source
  • debian debian linux · 8.0; 9.0 · NVD CPE · Source
  • canonical ubuntu linux · 12.04; 14.04; 16.04; 18.04; 19.04 · NVD CPE · Source
  • redhat openshift container platform · 3.11 · NVD CPE · Source
  • redhat enterprise linux · 7.5; 8.0; desktop 6.0; eus 7.5; eus 8.1; eus 8.2; eus 8.4; eus 8.6; server 6.0; server aus 7.4; server aus 8.2; server aus 8.4; server eus 5.6; server tus 7.4; server tus 8.2; server tus 8.4; server tus 8.6; workstation 6.0 · NVD CPE · Source
  • redhat enterprise linux desktop · 6.0 · NVD CPE · Source
  • redhat enterprise linux eus · 7.5; 8.1; 8.2; 8.4; 8.6 · NVD CPE · Source
  • redhat enterprise linux server · 6.0; aus 7.4; aus 8.2; aus 8.4; eus 5.6; tus 7.4; tus 8.2; tus 8.4; tus 8.6 · NVD CPE · Source
  • redhat enterprise linux server aus · 7.4; 8.2; 8.4 · NVD CPE · Source
  • redhat enterprise linux server eus · 5.6 · NVD CPE · Source
  • redhat enterprise linux server tus · 7.4; 8.2; 8.4; 8.6 · NVD CPE · Source
  • redhat enterprise linux workstation · 6.0 · NVD CPE · Source
  • redhat virtualization · 4.0 · NVD CPE · Source
  • oracle sun zfs storage appliance kit · 8.8.6 · NVD CPE · Source
NVD applicability prerequisites: cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*. These are conditions, not proof that an environment is exposed or unaffected.
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

Not provided by source

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Unknown
Exploited (source statement)
Unknown
Publicly disclosed (source)
Unknown

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched network-unauthenticated (CVSS AV:N, CVSS PR:N, CVSS UI:N)

Exposure

  1. Identify devices reporting this CVE and note which expose the affected service to untrusted networks.Telemetry: DeviceTvmSoftwareVulnerabilities · A network-reachable, no-privilege vector makes internet-facing instances the first exposure question. · Rule network-unauthenticated

Exploitation evidence

  1. Review inbound connections to the affected service from unexpected sources since the advisory date.Telemetry: DeviceNetworkEvents · Hunting hypothesis from the CVSS vector; it does not show that exploitation occurred. · Rule network-unauthenticated

Response

  1. Confirm the source-stated update is installed and the CVE is no longer reported.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies remediation. · Rule network-unauthenticated

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
cve@mitre.org
Record status · verification
UPDATED · NVD API
CPE
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*, cpe:2.3:o:fedoraproject:fedora:28:*:*:*:*:*:*:*, cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*, cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*, cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*, cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*, cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*, cpe:2.3:o:opensuse:leap:42.3:*:*:*:*:*:*:*, cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*, cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

Evidence & Provenance

3 public sources
bugs.python.orgSource recordnvd.nist.govSource recordaccess.redhat.comSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2019-9636
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2019-9636
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2019-9636"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

Correlated briefings

— No published briefing references this CVE

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.