PT-2026-60502 · Anthropic · Buffa

CVE-2026-55406 · Published 2026-07-16 · Updated 2026-07-16

NVD

CVSS v4.0

5.9

Medium

Base vector

AV:L/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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 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.

Fix

Information Disclosure

Use After Free

Weakness Enumeration

CWE-200

CWE-416

Related Identifiers

CVE-2026-55406

Affected Products

Buffa

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-55406 · Security Note
• https://github.com/anthropics/buffa/releases/tag/v0.7.0 · Note
• https://github.com/anthropics/buffa/security/advisories/GHSA-9pwq-gcrx-wghh · Note
• https://github.com/anthropics/buffa/commit/7dcf50a1a40eca6ed8d6c6dd59f4310aa0d68b0e · Note
• https://github.com/anthropics/buffa/pull/154 · Note