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GHSA-9pwq-gcrx-wghh

Buffa has a Use-After-Free in OwnedView via Unsound 'static Lifetime Promotion in Deref

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-55406

Packages

EcosystemPackageAffectedFixed in
crates.io buffa < 0.7.0 0.7.0

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.