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Vulnerabilities CVE-2026-55406

CVE-2026-55406

Medium
Open
TLP:CLEAR

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

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Description

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.

Details

CVSS Score
5.9
EPSS Score
0.13%

2.8th percentile

CVSS Vector
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
Confidence
90%
Published
Jul 16, 2026
Last Modified
Jul 16, 2026
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