{"id":"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\u003cV\u003e 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.","aliases":["GHSA-9pwq-gcrx-wghh"],"modified":"2026-07-18T03:47:37.574987502Z","published":"2026-07-16T15:54:29.511Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-200","CWE-416"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55406.json"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/anthropics/buffa","events":[{"introduced":"0"},{"fixed":"7dcf50a1a40eca6ed8d6c6dd59f4310aa0d68b0e"},{"fixed":"9ce9ab74e4ea18c3abda901b4054fea3fa193349"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"0.7.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v0.3.0","v0.1.0","v0.2.0","v0.6.0","v0.5.0","v0.4.0","v0.5.2","v0.5.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55406.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N"}]}