{"id":"CVE-2020-35907","aliases":["GHSA-p9m5-3hj7-cp5r","RUSTSEC-2020-0061"],"url":"https://o3.security/vulnerability/CVE-2020-35907","summary":"futures_task::noop_waker_ref can segfault due to dereferencing a NULL pointer","details":"Affected versions of the crate used a UnsafeCell in thread-local storage to return a noop waker reference, assuming that the reference would never be returned from another thread.\n\nThis resulted in a segmentation fault crash if Waker::wake_by_ref() was called on a waker returned from another thread due to it attempting to dereference a pointer that wasn't accessible from the main thread.","published":"2020-12-31T09:15:15.240Z","modified":"2026-10-24T10:31:00.840451502Z","cvss":{"score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"crates.io","name":"futures-task","fixedVersion":"0.3.5"}],"fix":null,"references":[{"type":"EVIDENCE","url":"https://rustsec.org/advisories/RUSTSEC-2020-0061.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-35907"},{"type":"WEB","url":"https://github.com/rust-lang/futures-rs/issues/2091"},{"type":"PACKAGE","url":"https://github.com/rust-lang/futures-rs"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-24T10:31:00.840451502Z"}}