{"id":"CVE-2026-55406","aliases":["GHSA-9pwq-gcrx-wghh"],"url":"https://o3.security/vulnerability/CVE-2026-55406","summary":"Buffa: Use-After-Free in OwnedView via Unsound 'static Lifetime Promotion in Deref","details":"A soundness bug in `buffa`'s `OwnedView<V>` allowed safe Rust code to trigger a use-after-free. The `OwnedView::decode` constructor transmuted a borrowed slice to `&'static [u8]`, and the `Deref` implementation exposed the promoted `'static` lifetime on borrowed view fields (such as `&'static str` and `&'static [u8]`) to callers. Because these references appeared to be `'static`, the borrow checker permitted them to outlive the `OwnedView`; once the `OwnedView` was dropped and its backing buffer freed, those references became dangling, enabling memory corruption, information disclosure of freed heap contents, and cross-thread misuse — all without any `unsafe` code in the calling application. Users are advised to update to the latest patched version of buffa.\n\nThank you to hackerone.com/suul for reporting this issue.","published":"2026-07-16T15:54:29.511Z","modified":"2026-08-12T03:51:26.688146472Z","cvss":null,"epss":{"score":0.00193,"percentile":0.09288,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"buffa","fixedVersion":"0.7.0"}],"fix":{"url":"https://github.com/anthropics/buffa/commit/7dcf50a1a40eca6ed8d6c6dd59f4310aa0d68b0e","label":"anthropics/buffa@7dcf50a"},"references":[{"type":"WEB","url":"https://github.com/anthropics/buffa/releases/tag/v0.7.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55406.json"},{"type":"ADVISORY","url":"https://github.com/anthropics/buffa/security/advisories/GHSA-9pwq-gcrx-wghh"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55406"},{"type":"FIX","url":"https://github.com/anthropics/buffa/commit/7dcf50a1a40eca6ed8d6c6dd59f4310aa0d68b0e"},{"type":"FIX","url":"https://github.com/anthropics/buffa/pull/154"},{"type":"PACKAGE","url":"https://github.com/anthropics/buffa"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:26.688146472Z"}}