CVE-2019-18348 describes a CRLF injection vulnerability in Python's urllib2 (Python 2.x) and urllib (Python 3.x) libraries, affecting versions up to 2.7.17 and 3.8.0 respectively. An attacker can inject arbitrary HTTP headers by controlling a URL parameter, specifically within the host component, potentially leading to HTTP response splitting or other malicious behavior. Rated Medium severity (CVSS 6.1), this vulnerability has a network attack vector and low attack complexity, but requires user interaction (UI:R) and can result in limited confidentiality and integrity impacts. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 2.0, <= 2.7.17CPE matchmatch criteria | cpe:2.3:a:python:python:*:*:*:*:*:*:*:* | ||
>= 3.0, < 3.5.10CPE matchmatch criteria | cpe:2.3:a:python:python:*:*:*:*:*:*:*:* | ||
>= 3.6.0, < 3.6.11CPE matchmatch criteria | cpe:2.3:a:python:python:*:*:*:*:*:*:*:* | ||
>= 3.7.0, < 3.7.8CPE matchmatch criteria | cpe:2.3:a:python:python:*:*:*:*:*:*:*:* | ||
>= 3.8.0, < 3.8.3CPE matchmatch criteria | cpe:2.3:a:python:python:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
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Oct 29, 2024CVE-2019-18348
Nov 10, 2020An 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.
Oct 8, 2019python: CRLF injection via the host part of the url passed to urlopen()
Jul 4, 2019