CVE-2026-113721: virtualenv · Generated files can follow existing destination links
Affects virtualenvSource GCVE Database
Not known to be exploited · CVSS 4.5 Medium : upgrade to 21.14.9 when convenient.
Data as of 29 Oct 2026, 14:41 UTC
Thin evidence
One scorer or none| CNA (GitHub_M) | CVSS 3.1 | 4.5 |
|---|
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 3% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 21.14.9
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:LExploitation evidence
Disclosed: evidence found.
CVE published 20 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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 virtualenv to 21.14.9.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Bitnamivirtualenvpkg:bitnami/virtualenvOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Upgrade virtualenv to version 21.14.9 or later, where this vulnerability is fixed. No other mitigation is required as the patch addresses the issue directly.
Description
A vulnerability in virtualenv prior to version 21.14.9 allows local attackers to cause environment creation to overwrite files outside the intended directory tree by exploiting how symbolic or hard links are handled during activation file generation. This can lead to unauthorized file modification with the invoking user's permissions. The issue is fixed in version 21.14.9.
References
- github.com/pypa/virtualenv/commit/d25f28699eefb1fc34a251e5adf2b5de844c36cd (opens in a new tab)
- github.com/pypa/virtualenv/pull/3431 (opens in a new tab)
- github.com/pypa/virtualenv/releases/tag/21.14.9 (opens in a new tab)
- github.com/pypa/virtualenv/security/advisories/GHSA-558c-9hv2-4prj (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-113721 (opens in a new tab)