{"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":"Buffa is a pure-Rust Protocol Buffers implementation with first-class protobuf editions support. Prior to 0.7.0, a soundness bug in the OwnedView<V> type 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, so the borrow checker permitted those references to outlive the OwnedView; once the OwnedView was dropped and its backing buffer freed, the references became dangling, enabling memory corruption, information disclosure of freed heap contents, and cross-thread misuse without any unsafe code in the calling application. This issue is fixed in version 0.7.0.","published":"2026-07-16T15:54:29.511Z","modified":"2026-08-12T03:51:26.688146472Z","cvss":null,"epss":null,"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:26.688146472Z"}}