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CVE-2019-18348

MEDIUM
6.1
CVSS Score
Published: October 23, 2019 at 04:31 PM UTC
Updated: October 14, 2026 at 07:16 AM UTC
1 product affected across 1 vendorPython

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Severity
MEDIUM6.1
Exploit prediction
EPSS 4%
SSVC
No known exploit

Description

An issue was discovered in urllib2 in Python 2.x through 2.7.17 and urllib in Python 3.x through 3.8.0. CRLF injection is possible if the attacker controls a url parameter, as demonstrated by the first argument to urllib.request.urlopen with \r\n (specifically in the host component of a URL) followed by an HTTP header. This is similar to the CVE-2019-9740 query string issue and the CVE-2019-9947 path string issue. (This is not exploitable when glibc has CVE-2016-10739 fixed.). This is fixed in: v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1; v3.6.11, v3.6.11rc1, v3.6.12; v3.7.8, v3.7.8rc1, v3.7.9; v3.8.3, v3.8.3rc1, v3.8.4, v3.8.4rc1, v3.8.5, v3.8.6, v3.8.6rc1.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Python· Python
95%
2.0 ≤ v ≤ 2.7.173.0 ≤ v < 3.5.103.6.0 ≤ v < 3.6.113.7.0 ≤ v < 3.7.83.8.0 ≤ v < 3.8.3
Affected range stops below 3.5.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.6.11, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.7.8, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.8.3, so it looks safe — our inference, not a vendor statement

References (14)

Vendor Advisoryx_refsource_SUSEMailing ListTechnical Description
Source: [email protected]
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00041.html
x_refsource_MISCIssue TrackingVendor Advisory
Source: [email protected]
https://bugs.python.org/issue30458#msg347282
x_refsource_MISCIssue TrackingThird Party Advisory
Source: [email protected]
https://bugzilla.redhat.com/show_bug.cgi?id=1727276
Mailing Listx_refsource_MLISTTechnical Description
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4X3HW5JRZ7GCPSR7UHJOLD7AWLTQCDVR/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/A5NSAX4SC3V64PGZUPH7PRDLSON34Q5A/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JCPGLTTOBB3QEARDX4JOYURP6ELNNA2V/
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M34WOYCDKTDE5KLUACE2YIEH7D37KHRX/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-74

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