CVE-2026-54900 vulnerabilities

Vulnerabilities for packages: ruby3.2-fluentd-kubernetes-daemonset, ruby4.0-fluentd-kubernetes-daemonset, ruby3.3-fluentd-kubernetes-daemonset, ruby3.4-fluentd-kubernetes-daemonset, kube-logging-operator...

fluent-plugin-opentelemetry Has Denial of Service (DoS) via Large Payloads and Decompression Bombs in `in_opentelemetry`

The fluent-plugin-opentelemetry plugin specifically the inopentelemetry HTTP input lacked strict size limits on incoming requests. It was discovered that the plugin read the entire request body and decompressed payloads into memory without enforcing maximum size thresholds. If the OpenTelemetry...

GHSA-2JC5-XHX8-QJ6H fluent-plugin-opentelemetry Has Denial of Service (DoS) via Large Payloads and Decompression Bombs in `in_opentelemetry`

The fluent-plugin-opentelemetry plugin specifically the inopentelemetry HTTP input lacked strict size limits on incoming requests. It was discovered that the plugin read the entire request body and decompressed payloads into memory without enforcing maximum size thresholds. If the OpenTelemetry...

fluent-plugin-s3 Vulnerable to Denial of Service (DoS) via Decompression Bomb in `in_s3`

The fluent-plugin-s3 plugin specifically the ins3 input plugin supports reading and decompressing heavily compressed files such as gzip, lzma2, and lzop from Amazon S3. It was discovered that the plugin read the entire decompressed payload into memory at once without enforcing a strict size limit...

GHSA-XV9W-7V6Q-HPJH fluent-plugin-s3 Vulnerable to Denial of Service (DoS) via Decompression Bomb in `in_s3`

The fluent-plugin-s3 plugin specifically the ins3 input plugin supports reading and decompressing heavily compressed files such as gzip, lzma2, and lzop from Amazon S3. It was discovered that the plugin read the entire decompressed payload into memory at once without enforcing a strict size limit...

Server-side Request Forgery (SSRF)

Overview Affected versions of this package are vulnerable to Server-side Request Forgery SSRF via the outhttp process when untrusted user input is used in the endpoint configuration parameter. An attacker can cause the system to send HTTP requests to arbitrary internal services by manipulating...

GHSA-72F5-RR8C-R6GR Fluentd is Vulnerable to Server-Side Request Forgery (SSRF) via Placeholder Expansion in `out_http`

The outhttp output plugin allows the use of placeholders such as $tag in the endpoint configuration parameter. It was discovered that if the placeholder value is derived from untrusted user input, an attacker can maliciously control the destination hostname of the outbound HTTP requests made by...

Fluentd is Vulnerable to Server-Side Request Forgery (SSRF) via Placeholder Expansion in `out_http`

The outhttp output plugin allows the use of placeholders such as $tag in the endpoint configuration parameter. It was discovered that if the placeholder value is derived from untrusted user input, an attacker can maliciously control the destination hostname of the outbound HTTP requests made by...

GHSA-J9CW-HWQF-85W7 Fluentd is Vulnerable to Denial of Service (DoS) via Gzip Decompression Bomb in `in_http` and `in_forward`

Fluentd's inhttp and inforward plugins support receiving gzip-compressed data. While Fluentd correctly enforces size limits on the incoming compressed payloads e.g., via bodysizelimit or chunksizelimit, it was discovered that there is no limit enforced on the size of the decompressed data. If a...

Improper Handling of Highly Compressed Data (Data Amplification)

Overview Affected versions of this package are vulnerable to Improper Handling of Highly Compressed Data Data Amplification in the inhttp and inforward plugins when decompressing gzip-compressed data. An attacker can cause excessive memory consumption by sending a highly compressed payload that...

GHSA-PR7J-96CJ-549H Fluentd is Vulnerable to Exposure of Sensitive Information via Monitor Agent API

Fluentd's Monitor Agent plugin inmonitoragent exposes internal metrics and plugin information via a REST API. It was discovered that the API response /api/plugins.json and related endpoints unintentionally includes internal instance variables of loaded plugins. If any plugins store sensitive...

Missing Authentication for Critical Function

Overview Affected versions of this package are vulnerable to Missing Authentication for Critical Function via the inmonitoragent process. An attacker can access sensitive internal instance variables, including credentials, by sending HTTP requests to the Monitor Agent API endpoints. The impact...

Fluentd is Vulnerable to Exposure of Sensitive Information via Monitor Agent API

Fluentd's Monitor Agent plugin inmonitoragent exposes internal metrics and plugin information via a REST API. It was discovered that the API response /api/plugins.json and related endpoints unintentionally includes internal instance variables of loaded plugins. If any plugins store sensitive...

Fluentd is Vulnerable to Remote Code Execution (RCE) via Arbitrary File Write in `${tag}` Placeholder

Fluentd allows dynamically constructing file paths using the $tag placeholder. It was discovered that validation for this placeholder was insufficient. If a Fluentd instance is configured to receive logs from untrusted sources and uses the $tag placeholder in file configurations such as the path...

GHSA-44HJ-4M45-FRJ3 Fluentd is Vulnerable to Remote Code Execution (RCE) via Arbitrary File Write in `${tag}` Placeholder

Fluentd allows dynamically constructing file paths using the $tag placeholder. It was discovered that validation for this placeholder was insufficient. If a Fluentd instance is configured to receive logs from untrusted sources and uses the $tag placeholder in file configurations such as the path...

Arbitrary Code Injection

Overview Affected versions of this package are vulnerable to Arbitrary Code Injection via the path parameter in output plugins when using the $tag placeholder. An attacker can overwrite arbitrary files or inject malicious content by sending specially crafted log entries containing path traversal...

PT-2026-53006

The fluent-plugin-s3 plugin specifically the in s3 input plugin supports reading and decompressing heavily compressed files such as gzip, lzma2, and lzop from Amazon S3. It was discovered that the plugin read the entire decompressed payload into memory at once without enforcing a strict size limi...

PT-2026-53005

Name of the Vulnerable Software and Affected Versions Fluentd versions prior to 1.19.3 Description The out http output plugin allows the use of placeholders, such as $tag, in the endpoint configuration parameter. If a placeholder value is derived from untrusted input, an attacker can control the...

Fluentd is Vulnerable to Remote Code Execution (RCE) via Arbitrary File Write in `${tag}` Placeholder

Fluentd allows dynamically constructing file paths using the $tag placeholder. It was discovered that validation for this placeholder was insufficient. If a Fluentd instance is configured to receive logs from untrusted sources and uses the $tag placeholder in file configurations such as the path...

PT-2026-53002

Name of the Vulnerable Software and Affected Versions Fluentd versions prior to 1.19.3 Description Fluentd allows the dynamic construction of file paths using the $tag placeholder. Insufficient validation of this placeholder in file configurations, specifically within the path parameter of the ou...