CRLF injection in py3-virtualenv - #VU151616
Published: September 22, 2026
Vulnerability identifier: #VU151616
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-93
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to inject configuration values.
The vulnerability exists due to improper neutralization of line boundaries in PyEnvCfg.write() when serializing prompt values into pyvenv.cfg. A local user can supply a crafted prompt containing line boundaries to inject configuration values.
Exploitation requires the prompt to be derived from externally influenced data.
Affected software
py3-virtualenv
Remediation
Install security update from vendor's website.
py3-virtualenv - update to 21.7.11