{"cve":"CVE-2021-3426","nvd":{"published":"2021-05-20T13:15:07.753","modified":"2026-10-14T10:17:41.557","status":"Modified","description":"There's a flaw in Python 3's pydoc. A local or adjacent attacker who discovers or is able to convince another local or adjacent user to start a pydoc server could access the server and use it to disclose sensitive information belonging to the other user that they would not normally be able to access. The highest risk of this flaw is to data confidentiality. This flaw affects Python versions before 3.8.9, Python versions before 3.9.3 and Python versions before 3.10.0a7.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","score":5.7},"cwes":["CWE-22","CWE-200"],"references":["https://bugzilla.redhat.com/show_bug.cgi?id=1935913","https://lists.debian.org/debian-lts-announce/2021/04/msg00005.html","https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/25HVHLBGO2KNPXJ3G426QEYSSCECJDU5/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BF2K7HEWADHN6P52R3QLIOX27U3DJ4HI/"],"products":["debian:debian_linux","fedoraproject:fedora","netapp:cloud_backup","netapp:ontap_select_deploy_administration_utility","netapp:snapcenter","oracle:communications_cloud_native_core_binding_support_function","oracle:zfs_storage_appliance_kit","python:python","redhat:enterprise_linux","redhat:software_collections"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-3426","score":0.01878,"percentile":0.7928,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}