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Vulnerability details: VCID-ue7j-kq6d-xbeb
Vulnerability ID VCID-ue7j-kq6d-xbeb
Aliases CVE-2019-9740
Summary An issue was discovered in urllib2 in Python 2.x through 2.7.16 and urllib in Python 3.x through 3.7.3. 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 query string after a ? character) followed by an HTTP header or a Redis command. This is fixed in: v2.7.17, v2.7.17rc1, v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1, 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; v3.7.4, 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.
Status Published
Exploitability 0.5
Weighted Severity 5.9
Risk 3.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
System Score Found at
cvssv3 6.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-9740.json
epss 0.0991 https://api.first.org/data/v1/epss?cve=CVE-2019-9740
epss 0.0991 https://api.first.org/data/v1/epss?cve=CVE-2019-9740
cvssv3 5.4 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-9740.json
https://api.first.org/data/v1/epss?cve=CVE-2019-9740
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9740
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
1688169 https://bugzilla.redhat.com/show_bug.cgi?id=1688169
GLSA-202003-26 https://security.gentoo.org/glsa/202003-26
RHSA-2019:2030 https://access.redhat.com/errata/RHSA-2019:2030
RHSA-2019:3520 https://access.redhat.com/errata/RHSA-2019:3520
RHSA-2019:3725 https://access.redhat.com/errata/RHSA-2019:3725
RHSA-2020:1268 https://access.redhat.com/errata/RHSA-2020:1268
RHSA-2020:1346 https://access.redhat.com/errata/RHSA-2020:1346
RHSA-2020:1462 https://access.redhat.com/errata/RHSA-2020:1462
USN-4127-1 https://usn.ubuntu.com/4127-1/
USN-4127-2 https://usn.ubuntu.com/4127-2/
USN-6891-1 https://usn.ubuntu.com/6891-1/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-9740.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.93153
EPSS Score 0.0991
Published At June 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T17:08:36.248265+00:00 Debian Importer Import https://security-tracker.debian.org/tracker/data/json 38.6.0