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  4. CVE 2026 115586 virtualenv bash activator leaves the prompt value
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Back to active CVEs
High · CVSS 7.1CVE-2026-115586GHSA-CX6F-VJHG-G3CC

virtualenv: Bash activator leaves the --prompt value unescaped in PS1 when promptvars is off, so prompt expansion later executes it (regression in 21.14.9)CVE-2026-115586

Answer in brief

CVE-2026-115586 records a High severity (CVSS 7.1) vulnerability in virtualenv: Bash activator leaves the --prompt value unescaped in PS1 when promptvars is off, so prompt expansion later executes it (regression in 21.14.9). The current sources do not mark it as known exploited. The current feed maps pypa/virtualenv (generic), virtualenv (pip), virtualenv (pypi). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 23, 2026Updated Oct 23, 2026Source checked Oct 23, 2026First seen by HOL Oct 23, 2026Material review Oct 23, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.1
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps pypa/virtualenv (generic), virtualenv (pip), virtualenv (pypi). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
pypa/virtualenvgeneric>=21.14.9 <21.14.1321.14.13
virtualenvpip>=21.14.9,<21.14.1321.14.13
virtualenvpypi>=21.14.9 <21.14.1321.14.13

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for pypa/virtualenv, virtualenv, virtualenv.
  2. 2Review the reported fix. Update pypa/virtualenv to 21.14.13; virtualenv to 21.14.13; virtualenv to 21.14.13 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 23, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 23, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 23, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

virtualenv is a tool for creating isolated virtual python environments. From 21.14.9 until 21.14.13, the bash bin/activate script can copy an attacker-controlled --prompt value into PS1 without escaping dollar signs or backticks when both promptvars and POSIX mode are disabled during activation. Re-enabling promptvars, running set -o posix, or starting an interactive child bash that inherits the exported PS1 can then expand command substitution in the stored VIRTUAL_ENV_PROMPT value and execute commands as the user who activates the environment. This issue is fixed in version 21.14.13.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

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  • Twisted: Denial of Service in the Twisted IMAP4 Server via a Negative Literal Size in SEARCHSame pip ecosystem
  • Twisted: Unauthenticated Remote Denial of Service in the Twisted words domish XML Element Stream via an Unbounded Element TreeSame pip ecosystem
  • Twisted: Unauthenticated Remote Denial of Service in the Twisted IRC Server via an Unbounded Line BufferSame pip ecosystem

Record context

Vulnerability class
Command Injection
EPSS
Not reported
CWE IDs
CWE-78
Source
CVE List V5
Source checked
Oct 23, 2026
References
6 linked sources
Open source record