Reference page — cumulative record through Thursday, October 8, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2019-9947

CVE-2019-9947MEDIUM

n/a n/a — An issue was discovered in urllib2 in Python 2.x through 2.7.16 and urllib in Python 3.x through 3.7.3.

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  C  L  L  N    6.1   .0525   92.3     —

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Mar 23  Reserved by mitre
  Mar 23  Published (CNA: mitre)
  Oct 7   EXPLOIT PUBLISHED — CVE-2019-9947. Public exploit reference added.
  Oct 7   RESCORED — CVE-2019-9947. CVSS 5.4 → 6.1 (NVD).

CWE-93 · CNA: mitre · CVSS v3.1 · 21 references · NVD status: Modified

Description

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 path component of a URL that lacks a ? character) followed by an HTTP header or a Redis command. This is similar to the CVE-2019-9740 query string issue. 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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
March 23, 2019	Reserved	Reserved by mitre
March 23, 2019	Published	Published (CNA: mitre)
October 7, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2019-9947. Public exploit reference added.
October 7, 2026	RESCORED	RESCORED — CVE-2019-9947. CVSS 5.4 → 6.1 (NVD).

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-93

References (21)

http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00062.html [Mailing List, Third Party Advisory]
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00063.html [Mailing List, Third Party Advisory]
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html [Mailing List, Third Party Advisory]
http://www.openwall.com/lists/oss-security/2021/02/04/2 [Mailing List, Third Party Advisory]
https://access.redhat.com/errata/RHSA-2019:1260 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2019:2030 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2019:3335 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2019:3520 [Third Party Advisory]
https://access.redhat.com/errata/RHSA-2019:3725 [Third Party Advisory]
https://bugs.python.org/issue35906 [Exploit, Issue Tracking, Patch, Vendor Advisory]
https://lists.debian.org/debian-lts-announce/2019/06/msg00022.html [Mailing List, Third Party Advisory]
https://lists.debian.org/debian-lts-announce/2019/06/msg00023.html [Mailing List, Third Party Advisory]
https://lists.debian.org/debian-lts-announce/2019/06/msg00026.html [Mailing List, Third Party Advisory]
https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html [Mailing List, Third Party Advisory]
https://lists.debian.org/debian-lts-announce/2020/08/msg00034.html [Third Party Advisory]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JMWSKTNOHSUOT3L25QFJAVCFYZX46FYK/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JXASHCDD4PQFKTMKQN4YOP5ZH366ABN4/
https://security.gentoo.org/glsa/202003-26 [Third Party Advisory]
https://security.netapp.com/advisory/ntap-20190404-0004/ [Third Party Advisory]
https://usn.ubuntu.com/4127-1/ [Third Party Advisory]
https://usn.ubuntu.com/4127-2/ [Third Party Advisory]

Authoritative record: CVE-2019-9947 at cve.org

Weaknesses: CWE-93

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2019-9947 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Thursday, October 8, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.