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CVE-2026-61674— Fluent Bit: Remote stack buffer overflow in Fluent Bit `out_forward` Secure-Forward `PONG` handler

一分钟漏洞结论

影响对象
fluent fluent-bit
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

Fluent Bit is a fast and lightweight logs, metrics, and traces processor for Linux, BSD, macOS, and Windows. From 0.11.0 until 5.0.8, plugins/out_forward/forward.c secure_forward_pong copies the server-controlled PONG[2] reason into the 32-byte stack buffer ms

CVSS 9.2 · Critical EPSS 0.65% · P50

影响版本矩阵 1

厂商产品 版本范围状态
fluent fluent-bit >= 0.11.0, < 5.0.8 affected
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一、 漏洞 CVE-2026-61674 基础信息

漏洞信息

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Vulnerability Title
Fluent Bit: Remote stack buffer overflow in Fluent Bit `out_forward` Secure-Forward `PONG` handler
来源: CVE Program / CVE List V5
Vulnerability Description
Fluent Bit is a fast and lightweight logs, metrics, and traces processor for Linux, BSD, macOS, and Windows. From 0.11.0 until 5.0.8, plugins/out_forward/forward.c secure_forward_pong copies the server-controlled PONG[2] reason into the 32-byte stack buffer msg with memcpy without checking its MessagePack type or length. An attacker who controls or can impersonate an out_forward Secure Forward destination configured with Shared_Key or Empty_Shared_Key can send an oversized reason during the first handshake and overwrite stack control data. Protected builds reliably terminate, while builds without a stack canary or with a disclosure can allow remote code execution as the Fluent Bit process user. When the opt-in --supervisor mode is used, fork-only respawns preserve the canary and address layout, allowing repeated crash-or-survive probes to support code execution on a hardened build; ordinary exec-based or service-manager restarts do not preserve that state. This issue is fixed in version 5.0.8.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
来源: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
来源: CVE Program / CVE List V5

受影响产品

厂商 产品 影响版本 CPE 订阅
fluent fluent-bit >= 0.11.0, < 5.0.8 -

二、漏洞 CVE-2026-61674 的公开POC

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三、漏洞 CVE-2026-61674 的情报信息

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CVE-2026-61674 补丁与修复 (2)

CVE-2026-61674 其他参考 (2)

IV. Related Vulnerabilities

Same vendor: fluent
Same weakness: CWE-121

V. Comments for CVE-2026-61674

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