Open edX Platform: Path traversal via prefix-bypass in safe_extractall Path Validation

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-85272
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 21:18:44 UTC
Updated2026-09-24 21:20:08 UTC
DescriptionOpen 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.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS: 0.004760000 probability, percentile 0.385400000 (date 2026-09-25)

Problem Types: CWE-22 | CWE-22 CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Openedx Openedx-platform affected >= release/aspen.1, < release/ulmo.4 Not specified
CNA Openedx Openedx-platform affected >= release/aspen.1, < release/verawood.1 Not specified

References

ReferenceSourceLinkTags
github.com/openedx/openedx-platform/security/advisories/GHSA-6cmm-8875-5pcw [email protected] github.com
github.com/openedx/openedx-platform/releases/tag/release/ulmo.4 [email protected] github.com
github.com/openedx/openedx-platform/commit/97de0586d878936c9f97c03fdaa20... [email protected] github.com
github.com/openedx/openedx-platform/commit/8422334e2063015a28b6460a34aa4... [email protected] github.com
github.com/openedx/openedx-platform/releases/tag/release/verawood.1 [email protected] github.com
github.com/openedx/openedx-platform/commit/e552907ff33a7b2e53f99b819123c... [email protected] github.com
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