CVE-2026-55407— Buffa: Memory Exhaustion Denial of Service in decode_unknown_field via Unbounded Allocation

Buffa: Memory Exhaustion Denial of Service in decode_unknown_field via Unbounded Allocation

Buffa is a pure-Rust Protocol Buffers implementation with first-class protobuf editions support. Prior to 0.8.0, the decode_unknown_field function in buffa's protobuf decoder allocated heap memory in proportion to untrusted input (unknown fields in the serialized protobuf) without enforcing an allocation budget, affecting any message decoded from untrusted input using code generated with preserve_unknown_fields=true (the default); a small, well-formed payload of nested unknown fields inside a StartGroup could trigger roughly 22x memory amplification (for example a 64 MiB input forcing about 1.4 GB of heap allocation), and length-delimited unknown fields could be sized arbitrarily, so an unauthenticated attacker could crash a process through memory exhaustion because the top-level message size cap did not account for in-decode amplification. This issue is fixed in version 0.8.0.

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

未加控制的资源消耗(资源穷尽)

Anthropic buffa 资源管理错误漏洞

Anthropic buffa是美国Anthropic公司的一款代理服务器软件。 Anthropic buffa 0.8.0之前版本存在资源管理错误漏洞，该漏洞源于decode_unknown_field函数分配堆内存与不可信输入成比例，未强制执行分配预算，可能导致未经身份验证的攻击者通过内存耗尽使进程崩溃。

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