CVE-2026-85272
Open edX Platform: Path traversal via prefix-bypass in safe_extractall Path Validation
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
Open edX Platform enables the authoring and delivery of online learning at any scale. From Aspen.1 until Ulmo and Verawood.1, openedx/core/lib/extract_archive.py uses _is_bad_path to validate safe_extractall targets by comparing resolved path strings with startswith instead of comparing path components. A course author or staff user with course import permission can submit a crafted .tar.gz archive through the import_olx flow initiated by cms.djangoapps.contentstore.views.import_export.import_handler. An archive member can therefore escape into a sibling course staging directory whose name shares the attacker's base64 directory prefix, causing limited cross-tenant file corruption. Zip archives are not practically affected because ZipFile.extractall strips parent traversal segments, and the advisory does not establish arbitrary filesystem writes, file reads, or direct code execution. This issue is fixed in Ulmo and Verawood.1.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
| NVDNVD · Awaiting Analysis | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.48% · top 59% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.
Weakness
Affected products
- affected >= release/aspen.1, < release/ulmo.4
- affected >= release/aspen.1, < release/verawood.1
References (6)
- https://github.com/openedx/openedx-platform/security/advisories/GHSA-6cmm-8875-5pcw (opens in a new tab)x_refsource_CONFIRM
- https://github.com/openedx/openedx-platform/commit/8422334e2063015a28b6460a34aa4bb4d8ae1ca8 (opens in a new tab)x_refsource_MISC
- https://github.com/openedx/openedx-platform/commit/97de0586d878936c9f97c03fdaa20346ee8eac29 (opens in a new tab)x_refsource_MISC
- https://github.com/openedx/openedx-platform/commit/e552907ff33a7b2e53f99b819123c9dacdfc127a (opens in a new tab)x_refsource_MISC
- https://github.com/openedx/openedx-platform/releases/tag/release/ulmo.4 (opens in a new tab)x_refsource_MISC
- https://github.com/openedx/openedx-platform/releases/tag/release/verawood.1 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-85272)Record last updated .