GHSA-9PWQ-GCRX-WGHH

Vulnerability from github – Published: 2026-08-28 18:33 – Updated: 2026-08-28 18:33
VLAI
Summary
Buffa has a Use-After-Free in OwnedView via Unsound 'static Lifetime Promotion in Deref
Details

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.

Severity
5.9 (Medium)
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
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{
  "affected": [
    {
      "package": {
        "ecosystem": "crates.io",
        "name": "buffa"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.7.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55406"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-416"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-28T18:33:58Z",
    "nvd_published_at": "2026-07-16T17:16:57Z",
    "severity": "MODERATE"
  },
  "details": "A soundness bug in `buffa`\u0027s `OwnedView\u003cV\u003e` allowed safe Rust code to trigger a use-after-free. The `OwnedView::decode` constructor transmuted a borrowed slice to `\u0026\u0027static [u8]`, and the `Deref` implementation exposed the promoted `\u0027static` lifetime on borrowed view fields (such as `\u0026\u0027static str` and `\u0026\u0027static [u8]`) to callers. Because these references appeared to be `\u0027static`, 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 \u2014 all without any `unsafe` code in the calling application. Users are advised to update to the latest patched version of buffa.\n\nThank you to hackerone.com/suul for reporting this issue.",
  "id": "GHSA-9pwq-gcrx-wghh",
  "modified": "2026-08-28T18:33:58Z",
  "published": "2026-08-28T18:33:58Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/anthropics/buffa/security/advisories/GHSA-9pwq-gcrx-wghh"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55406"
    },
    {
      "type": "WEB",
      "url": "https://github.com/anthropics/buffa/pull/154"
    },
    {
      "type": "WEB",
      "url": "https://github.com/anthropics/buffa/commit/7dcf50a1a40eca6ed8d6c6dd59f4310aa0d68b0e"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/anthropics/buffa"
    },
    {
      "type": "WEB",
      "url": "https://github.com/anthropics/buffa/releases/tag/v0.7.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Buffa has a Use-After-Free in OwnedView via Unsound \u0027static Lifetime Promotion in Deref"
}



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