GHSA-9pwq-gcrx-wghh
Buffa has a Use-After-Free in OwnedView via Unsound 'static Lifetime Promotion in Deref
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
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.
Thank you to hackerone.com/suul for reporting this issue.
References
External links from the advisory. They lead to third-party sites.
- https://github.com/anthropics/buffa/security/advisories/GHSA-9pwq-gcrx-wghh
- https://nvd.nist.gov/vuln/detail/CVE-2026-55406
- https://github.com/anthropics/buffa/pull/154
- https://github.com/anthropics/buffa/commit/7dcf50a1a40eca6ed8d6c6dd59f4310aa0d68b0e
- https://github.com/anthropics/buffa
- https://github.com/anthropics/buffa/releases/tag/v0.7.0