---
id: CVE-2026-55406
aliases:
  - GHSA-9pwq-gcrx-wghh
title: >-
  Buffa has a Use-After-Free in OwnedView via Unsound 'static Lifetime Promotion
  in Deref
summary: >-
  Buffa has a Use-After-Free in OwnedView via Unsound 'static Lifetime Promotion
  in Deref
severity: medium
cwe:
  - CWE-200
  - CWE-416
vendor: buffa
product: buffa
ecosystem: rust
affected:
  - buffa < 0.7.0
patched:
  - buffa 0.7.0
published: '2026-08-28'
updated: '2026-08-28'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-9pwq-gcrx-wghh'
references:
  - url: >-
      https://github.com/anthropics/buffa/security/advisories/GHSA-9pwq-gcrx-wghh
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-55406'
  - url: 'https://github.com/anthropics/buffa/pull/154'
  - url: >-
      https://github.com/anthropics/buffa/commit/7dcf50a1a40eca6ed8d6c6dd59f4310aa0d68b0e
  - url: 'https://github.com/anthropics/buffa/releases/tag/v0.7.0'
  - url: 'https://github.com/advisories/GHSA-9pwq-gcrx-wghh'
tags:
  - ghsa
  - rust
epss: 0.00193
epssPercentile: 0.08018
ingestedAt: '2026-08-28T19:24:19.382Z'
---

## Overview

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.

## Affected packages

- `buffa < 0.7.0`

## Remediation

Upgrade to a patched release:

- `buffa 0.7.0`