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VulnerabilityPublished Updated

CVE-2026-102925: Pipenv · virtualenv bash and fish activation scripts execute commands embedded in paths

Affects pipenvSource GCVE Database

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Authoritative record:CVE-2026-102925· High 7.8

Not known to be exploited · CVSS 7.8 High : upgrade to 2026.8.0_1 soon.

Data as of 30 Oct 2026, 07:30 UTC

CVSS 3.1 base score
7.8High
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 2026.8.0_1
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 29 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade pipenv to 2026.8.0_1.

Affected software

ProductAffectedFixed in
Homebrewpipenvpkg:brew/pipenvOther threatsAffected
  • >=2025.0.4 <2026.8.0_1
Fixed in
  • 2026.8.0_1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

### Impact The generated `activate` (bash/zsh) and `activate.fish` scripts interpolate a `shlex.quote`-ed value into a position that quotes it a second time. The extra quotes terminate the quoted run early and leave part of the value parsed as shell code, so a path containing shell metacharacters runs commands when a user sources the activation script. `activate` is affected through the virtual environment's own path, on the branch that reports a relocated environment: ```sh echo "Virtual environment directory __VIRTUAL_ENV__ does not exist!" >&2 ``` For a destination named `x'$(id)'y`, `shlex.quote` emits `'x'"'"'$(id)'"'"'y'`. The inner `"` closes the enclosing double quote and `$(id)` is left unquoted. Backtick and `;` payloads reach the same result. This branch runs whenever the recorded path is absent, which is the normal case for a virtual environment copied or distributed to another machine. `activate.fish` is affected through the interpreter's Tcl/Tk library paths: ```fish set -gx TCL_LIBRARY '__TCL_LIBRARY__' ``` `shlex.quote` already returns `'/tcl/(cmd)/lib'`, so the rendered line is `''/tcl/(cmd)/lib''`. fish concatenates the adjacent quoted runs and expands the `(cmd)` left between them. The same doubling also splits a path containing a space into two list elements, corrupting `TCL_LIBRARY` and `TK_LIBRARY`. This is the same defect class as GHSA-x78j-v8h9-3j2q, which covered `activate.bat`. ### Patches Fixed in 21.7.13 by moving the placeholders outside the surrounding quotes, so each value keeps only the quoting `shlex.quote` applied. Fix: https://github.com/pypa/virtualenv/pull/3252 ### Workarounds Avoid creating or distributing virtual environments whose path contains `'`, `` ` ``, `$`, `;`, `(` or `)`, and inspect the generated activation script before sourcing one you did not create.

References

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