Exploit discussion active in current signal (1 latest mentions)
Recommended action window: High priority (within 72h)
NVD 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.
Priority
LOW
Exploitation
NONE
PoC
YES
Patch
AVAILABLE
Momentum
STABLE
| Date | Total | Labels |
|---|
| 2026-09-21 | 1 | Patch1 |
| 2026-09-22 | 2 | Patch2 |
| 2026-09-24 | 2 | Patch1PoC1 |
| 2026-10-05 | 1 | Patch1 |
Fluent Bit Vulnerability Details and PoC Disclosed - https://securityonline.info/fluent-bit-vulnerability-poc-cve-2026-61674/
Post summary
The post focuses on the disclosure of a Fluent Bit vulnerability and explicitly references a PoC. No active exploitation, exploit tooling, patch, or detailed technical vulnerability specifics are provided.
🚨 HIGH - Stack Buffer Overflow in Fluent Bit (CVE-2026-61674) A stack buffer overflow vulnerability in Fluent Bit (plugins/out_forward/forward.c) allows a malicious or impersonated Secure Forward server to send an oversized PONG handshake reason. This overwrites stack control data and can lead to remote code execution as the Fluent Bit process user. 👉 Affected: Fluent Bit prior to 5.0.8 | Upgrade to v5.0.8 or later immediately
Post summary
The text discloses CVE-2026-61674 as a stack buffer overflow in Fluent Bit enabling RCE and explicitly directs users to upgrade to v5.0.8 or later.
CVE-2026-61674 Fluent Bit RCE, CVSS 8.1. A malicious Secure Forward destination can overflow a 32-byte stack buffer via an unchecked memcpy in forward.c, 0.11.0 through 5.0.8. Patch still under review, so restrict out_forward https://www.valtersit.com/cve/CVE-2026-61674 #CVE #infosec #FluentBit #FluentBit #CVEALERT #CVE #infosec #Linux #XSS #valtersit #snippet #SysAdmin #cybersecurity #devsecops #devops #developer #100daysofcode #git #github #gitlab #redteam #blueteam #ethicalhacker #cybersecurityawareness #cybersecuritynews #cybersecuritytips #python #hacker #kali #ubuntu #debian #docker
Post summary
The text announces a Critical RCE vulnerability in Fluent Bit, provides technical details including affected versions, and recommends restricting the Secure Forward destination as a temporary mitigation while the patch is under review.
Technical details and a PoC for a critical Fluent Bit vulnerability (CVE-2026-61674) are public. Patch this Fluent Bit vulnerability to prevent RCE attacks. #FluentBit #CVE202661674 #BufferOverflow #RCE #Cybersecurity #InfoSec https://securityonline.info/fluent-bit-vulnerability-poc-cve-2026-61674/
Post summary
The text announces that technical details and a PoC for CVE-2026-61674 (a critical Fluent Bit buffer overflow enabling RCE) are public and explicitly calls for patching to prevent exploitation.
Your log shipper can get owned by the destination it trusts. CVE-2026-61674: Fluent Bit Secure Forward copies an oversized PONG into a 32-byte stack buffer (CVSS 9.2). Impersonate the Shared_Key peer and you crash or RCE as the flb user. Ship 5.0.8+, then audit every out_forward Shared_Key destination. https://app.opencve.io/cve/CVE-2026-61674
Post summary
The message highlights a critical buffer overflow in Fluent Bit (CVE‑2026‑61674) and directs users to upgrade to version 5.0.8+ and review Shared_Key configurations.
Fluent Bit's Secure Forward made the client prove it knew the shared key and never checked that the server did. The 9.2 patch fixed the overflow, not the trust. No exploitation reported. https://severitydaily.com/fluent-bit-cve-2026-61674-secure-forward-pong-overflow-5-0-9-mutual-auth/
Post summary
The text highlights a vulnerability in Fluent Bit's Secure Forward, mentioning that a patch in version 9.2 fixed an overflow but not the underlying trust issue, with no reported exploitation.