{"cve":"CVE-2021-26956","nvd":{"published":"2021-02-09T23:15:13.960","modified":"2026-06-17T03:44:04.390","status":"Modified","description":"An issue was discovered in the xcb crate through 2021-02-04 for Rust. It has a soundness violation because bytes from an X server can be interpreted as any data type returned by xcb::xproto::GetPropertyReply::value.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":[],"references":["https://rustsec.org/advisories/RUSTSEC-2021-0019.html","https://rustsec.org/advisories/RUSTSEC-2021-0019.html"],"products":["xcb_project:xcb"],"source":"nvd","synced_at":"2026-10-19T21:14:10.479542811+00:00"},"epss":{"cve":"CVE-2021-26956","score":0.01728,"percentile":0.77574,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-2xpg-3hx4-fm9r","url":"https://osv.dev/vulnerability/GHSA-2xpg-3hx4-fm9r","summary":"Out of bounds read in xcb","modified":"2024-03-15T00:05:17.174146Z","packages":[{"ecosystem":"crates.io","name":"xcb","purl":"pkg:cargo/xcb","ranges":["<1.0.0"],"fixed":["1.0.0"]}]},{"id":"GHSA-3288-cwgw-ch86","url":"https://osv.dev/vulnerability/GHSA-3288-cwgw-ch86","summary":"Unchecked Return Value in xcb","modified":"2024-03-15T00:05:17.174146Z","packages":[{"ecosystem":"crates.io","name":"xcb","purl":"pkg:cargo/xcb","ranges":["<1.0.0"],"fixed":["1.0.0"]}]},{"id":"GHSA-3cj3-jrrp-9rxf","url":"https://osv.dev/vulnerability/GHSA-3cj3-jrrp-9rxf","summary":"Unchecked Return Value in xcb","modified":"2024-03-15T00:05:17.174146Z","packages":[{"ecosystem":"crates.io","name":"xcb","purl":"pkg:cargo/xcb","ranges":["<1.0.0"],"fixed":["1.0.0"]}]},{"id":"GHSA-mp6r-fgw2-rxfx","url":"https://osv.dev/vulnerability/GHSA-mp6r-fgw2-rxfx","summary":"Arbitrary return types in xcb","modified":"2024-03-15T00:05:17.174146Z","packages":[{"ecosystem":"crates.io","name":"xcb","purl":"pkg:cargo/xcb","ranges":["<1.0.0"],"fixed":["1.0.0"]}]},{"id":"RUSTSEC-2021-0019","url":"https://osv.dev/vulnerability/RUSTSEC-2021-0019","summary":"Multiple soundness issues","modified":"2024-03-15T00:05:17.174146Z","packages":[{"ecosystem":"crates.io","name":"xcb","purl":"pkg:cargo/xcb","ranges":[">=0.0.0-0 <1.0.0"],"fixed":["1.0.0"]}]}],"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."]}