Distribution advisory
This page covers CVE-2019-11236 as tracked by PyPI (Root.io), for the package rootio-urllib3. The fix is available in version 1.21.1+root.io.4; earlier versions remain affected.
How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. Rated impact: confidentiality none, integrity none, availability none. (rating taken from the base CVE record.)
CVSS metrics in full
The score comes from this vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- Attack vector: Network — reachable from anywhere that can route to the service.
- Attack complexity: Low — the attack works reliably, with no preparation.
- Attack requirements: None — no deployment-specific condition has to hold.
- Privileges required: None — an unauthenticated stranger can try it.
- User interaction: Passive — a victim action is involved, but not a deliberate one.
- Confidentiality impact: None.
- Integrity impact: None.
- Availability impact: None.
Weakness class
ROOT-APP-PYPI-CVE-2019-11236 is classified as CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection'). The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.
Affected software
ROOT-APP-PYPI-CVE-2019-11236 is recorded against 2 packages.
- rootio-urllib3 (fixed in 1.21.1+root.io.4)
- urllib3 (fixed in 1.21.1+aikido.4)
Timeline and source
Published on 23 June 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.
Other advisories for this package
rootio-urllib3 has other advisories on record. If you are patching this one, these are worth checking on the same host:
Same weakness in other software
These advisories are the same class of weakness (CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')) in other software:
