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Linguistic Lumberjack is a critical memory corruption vulnerability in Fluent Bit’s embedded HTTP server affecting versions 2.0.7 through 3.0.3. The flaw is triggered while parsing trace-management requests to the monitoring API, specifically the traces endpoint, where the server improperly validates the data types of elements supplied in the "inputs" array and incorrectly treats them as string objects. Supplying non-string values such as integers can cause unsafe length and pointer handling during string creation and subsequent memory operations, leading to heap corruption, stack corruption, crashes, and unintended memory disclosure in HTTP responses. The issue was introduced in version 2.0.7 and fixed by adding proper type validation for values processed by the traces request parser.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specific security vulnerability in Fluent Bit that Microsoft states was resolved by upgrading Fluent Bit to version 3.0.5 in Azure Monitor Agent Windows 1.27.0.
A vulnerability in Fluent Bit's built-in HTTP server (aka Linguistic Lumberjack) that may allow denial-of-service, information disclosure, or remote code execution.
A critical memory corruption (heap buffer overflow) vulnerability in Fluent Bit’s embedded HTTP server trace-request parsing that can be exploited for denial-of-service and information disclosure, and potentially remote code execution under the right conditions.
A critical memory-corruption vulnerability in Fluent Bit’s built-in HTTP server (monitoring API /api/v1/traces parsing) caused by improper validation of MSGPACK input types, enabling denial of service, information disclosure, and potentially remote code execution.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.