If the value passed to os.path.expandvars() is user-controlled a performance degradation is possible when expanding environment variables.
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This medium-severity CVE scores 5.5 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 94% of all CVEs by exploit prediction. 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).
If the value passed to os.path.expandvars() is user-controlled a performance degradation is possible when expanding environment variables.
October 31, 2025
February 4, 2026
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Red Hat Security Advisory: Red Hat Update Infrastructure 5.1 security update
Red Hat Security Advisory: python3.12 security update
Red Hat Security Advisory: python3.12 security update
Red Hat Security Advisory: python3.12 security update
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Red Hat Security Advisory: Red Hat Ceph Storage
Red Hat Security Advisory: A Subscription Management tool for finding and reporting Red Hat product usage
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| ubuntu | python3.8-venv (3.8.0-3ubuntu1~18.04.2+esm7) @ bionic | 2026-05-29 | ubuntu |
| ubuntu | python3.13-venv (3.13.7-1ubuntu0.1) @ questing | 2026-05-29 | ubuntu |
| redhat | rhui5/rhua-rhel9:1779798222 | 2026-05-27 | redhat |
| redhat | python3.12-0:3.12.13-2.el10_2 | 2026-05-19 | redhat |
| redhat | python3.12-0:3.12.13-2.el9_8 | 2026-05-19 | redhat |
| redhat | python3.12-0:3.12.13-2.el8_10 | 2026-04-27 | redhat |
| redhat | python3-11-main-3.11.15-4.hum1 | 2026-04-17 | redhat |
| redhat | python3-12-main-3.12.13-3.hum1 | 2026-04-17 | redhat |
| redhat | python3-14-main-3.14.4-1.hum1 | 2026-04-11 | redhat |
| redhat | python3-13-main-3.13.13-1.hum1 | 2026-04-10 | redhat |
| redhat | rhceph/rhceph-8-rhel9:1769512383 | 2026-02-02 | redhat |
| redhat | rhui5/rhua-rhel9:1768377012 | 2026-01-15 | redhat |
| redhat | discovery/discovery-ui-rhel9:1767904573 | 2026-01-08 | redhat |
| redhat | python3.9-0:3.9.25-2.el9_7 | 2025-12-18 | redhat |
| redhat | python39-devel:3.9-8100020251126112422.d47b87a4 | 2025-12-18 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.
Quadratic complexity in os.path.expandvars() with user-controlled template
RHSA-2025:23342 — Low
RHSA-2025:23530 — Low
RHSA-2026:0685 — Low
RHSA-2026:7443 — Low
RHSA-2026:7661 — Low
Python vulnerabilities
Python vulnerabilities
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msrc · redhat
CWE-400