CVE-2026-102938

MEDIUMPre-NVD 5.85.8—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1% (2nd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
5.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

virtualenv is a tool for creating isolated virtual python environments. Prior to 21.7.11, PyEnvCfg.write() writes prompt values verbatim to the line-oriented pyvenv.cfg format while PyEnvCfg._read_values() parses the file with str.splitlines() and accepts the last value for duplicate keys. An attacker who influences --prompt, VIRTUALENV_PROMPT, or configuration input can insert a recognized line boundary and additional keys, including home, causing consumers to use an attacker-selected base interpreter or corrupted environment metadata. The security impact requires prompt input from outside the operator's trust boundary; directly supplied prompt content primarily corrupts the operator's own environment. This issue is fixed in version 21.7.11.

CVSS v3
5.8
EG Score
5.8MEDIUMmedium confidence
EG Risk
26
EG Risk 26/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity58% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
2nd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 29, 2026

Last Modified

September 30, 2026

Advisory Details (4)

Auto-updated Sep 29, 2026
Patch available. Sources: github_pr, github_commit, github_release, github.
github_release Patch Available

21.7.11

Patch available: pypa/virtualenv 21.7.11

https://github.com/pypa/virtualenv/releases/tag/21.7.11
github_commit Patch Available

commit a30f99546104 (pypa/virtualenv)

Patch available: pypa/virtualenv 21.7.11 (contains commit a30f99546104)

https://github.com/pypa/virtualenv/commit/a30f995461043acb6cacbf3a890951563ccf7140
github_pr Patch Available

🐛 fix(create): keep pyvenv.cfg values on a single line

Patch available: pypa/virtualenv 21.7.11 (PR #3247 merged 2026-09-17)

https://github.com/pypa/virtualenv/pull/3247
github Patch Available

virtualenv writes prompt values into pyvenv.cfg without sanitizing line boundaries, allowing configuration injection · Advisory · pypa/virtualenv · GitHub

https://github.com/pypa/virtualenv/security/advisories/GHSA-9h9j-4vrj-gf7g

Vendor Advisories for CVE-2026-102938(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
virtualenv0.8 ... 21.7.9 (280 versions)21.7.11—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 11× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-03 14:52 UTCEG score recompute
  2. 2026-10-03 14:25 UTCEPSS rescore
  3. 2026-10-02 16:43 UTCEG score recompute
  4. 2026-10-01 19:49 UTCEPSS rescore
  5. 2026-09-30 20:23 UTCEG score recompute
  6. 2026-09-30 19:56 UTCEG score recompute
  7. 2026-09-30 19:30 UTCEG score recompute
  8. 2026-09-30 15:02 UTCEPSS rescore
  9. 2026-09-29 21:21 UTCEG score recompute
  10. 2026-09-29 21:05 UTCEG score recompute
  11. 2026-09-29 21:03 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-102938?
CVE-2026-102938 is a medium vulnerability published on September 29, 2026. virtualenv is a tool for creating isolated virtual python environments. Prior to 21.7.11, PyEnvCfg.write() writes prompt values verbatim to the line-oriented pyvenv.cfg format while PyEnvCfg.readvalues() parses the file with str.splitlines() and accepts the last value for duplicate keys. An…
When was CVE-2026-102938 disclosed?
CVE-2026-102938 was first published on September 29, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-102938 actively exploited?
CVE-2026-102938 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-102938?
CVE-2026-102938 has a CVSS base score of 5.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-102938?
A fix for CVE-2026-102938 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-102938 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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