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CVE-2026-55406— Buffa: Use-After-Free in OwnedView via Unsound 'static Lifetime Promotion in Deref

Quick assessment

Affected
anthropics buffa
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Anthropic buffa是美国Anthropic公司的一款代理服务器软件。 Anthropic buffa 0.7.0之前版本存在安全漏洞，该漏洞源于OwnedView<V>类型中的健全性错误，允许安全Rust代码触发释放后重用。

AI Predicted 8.1 Difficulty: Moderate EPSS 0.19% · P9

Affected Version Matrix 1

VendorProduct Version RangeStatus
anthropics buffa < 0.7.0 affected
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I. Basic Information for CVE-2026-55406

Vulnerability Information
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Vulnerability Title
Buffa: Use-After-Free in OwnedView via Unsound 'static Lifetime Promotion in Deref
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Anthropic buffa 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Anthropic buffa是美国Anthropic公司的一款代理服务器软件。 Anthropic buffa 0.7.0之前版本存在安全漏洞，该漏洞源于OwnedView<V>类型中的健全性错误，允许安全Rust代码触发释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
anthropics buffa < 0.7.0 -

II. Public POCs for CVE-2026-55406

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III. Intelligence Information for CVE-2026-55406

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Vendor Advisories for CVE-2026-55406 (1)

Proof of Concept for CVE-2026-55406 (1)

Same Patch Batch · anthropics · 2026-07-16 · 3 CVEs total

CVE-2026-47751 Claude Code Action: Malicious MCP Server Configuration in PRs Enables Remote Code Executio
CVE-2026-55407 Buffa: Memory Exhaustion Denial of Service in decode_unknown_field via Unbounded Allocatio

IV. Related Vulnerabilities

Same product: buffa
Same vendor: anthropics
Same weakness: CWE-200