SB2026092256 - CRLF injection in py3-virtualenv
Published: September 22, 2026
Security Bulletin ID
SB2026092256
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) CRLF injection (CVE-ID: N/A)
CWE-ID: CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.