HTTP Request/response Smuggling

Http4s is vulnerable to HTTP request/response smuggling. The vulnerability is due to Ember’s chunk decoder accepting malformed chunk-size values with leading plus or minus signs, which allows an attacker to exploit differences in chunk-boundary parsing by intermediaries to bypass controls, poison...

HTTP Request Smuggling

Overview Affected versions of this package are vulnerable to HTTP Request Smuggling due to lenient parsing in the chunk decoder process. An attacker can bypass intermediary controls, poison caches, or hijack the request queue by crafting specially formatted chunked requests that exploit differenc...

HTTP Request Smuggling

Overview Affected versions of this package are vulnerable to HTTP Request Smuggling due to lenient parsing in the chunk decoder process. An attacker can bypass intermediary controls, poison caches, or hijack the request queue by crafting specially formatted chunked requests that exploit differenc...

HTTP Request Smuggling

Overview Affected versions of this package are vulnerable to HTTP Request Smuggling due to lenient parsing in the chunk decoder process. An attacker can bypass intermediary controls, poison caches, or hijack the request queue by crafting specially formatted chunked requests that exploit differenc...

GHSA-JRPM-956J-96JG Http4s: Ember chunk parser lenience (TE.TE request smuggling)

Summary Ember's chunk decoder parses the size token leniently: it strips leading and trailing whitespace and accepts a leading + or - sign. RFC9112 §7.1 defines chunk-size = 1HEXDIG. An intermediary that parses the chunk boundary differently or rejects it will disagree with Ember on request...

CVE-2026-69216

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s chunk decoder trims the chunk-size token and accepts leading plus or minus signs instead of requiring one or more hexadecimal digits followed by the required CRLF. When an intermediary forwards chunked data...

CVE-2026-69216 Http4s: Ember chunk parser lenience (TE.TE request smuggling)

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s chunk decoder trims the chunk-size token and accepts leading plus or minus signs instead of requiring one or more hexadecimal digits followed by the required CRLF. When an intermediary forwards chunked data...

EUVD-2026-79176

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s chunk decoder trims the chunk-size token and accepts leading plus or minus signs instead of requiring one or more hexadecimal digits followed by the required CRLF. When an intermediary forwards chunked data...

CVE-2026-69216 Http4s: Ember chunk parser lenience (TE.TE request smuggling)

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s chunk decoder trims the chunk-size token and accepts leading plus or minus signs instead of requiring one or more hexadecimal digits followed by the required CRLF. When an intermediary forwards chunked data...

PT-2026-92407

Name of the Vulnerable Software and Affected Versions Http4s versions prior to 0.23.35 Http4s versions prior to 1.0.0-M47 Description Ember's chunk decoder parses the chunk-size token leniently by trimming whitespace and accepting leading plus or minus signs, which deviates from the requirement f...

CVE-2026-69216: Inconsistent Interpretation of HTTP Requests

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, Ember’s chunk decoder trims the chunk-size token and accepts leading plus or minus signs instead of requiring one or more hexadecimal digits followed by the required CRLF. When an intermediary forwards chunked data...

CVE-2026-58187 Apache Traffic Server: Multiplexer plugin chunk decoder enables a denial of service

The Apache Traffic Server multiplexer plugin overruns its chunk-decode buffer on upstream input, enabling denial of service. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2....

CVE-2026-58187 Apache Traffic Server: Multiplexer plugin chunk decoder enables a denial of service

The Apache Traffic Server multiplexer plugin overruns its chunk-decode buffer on upstream input, enabling denial of service. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2....

CVE-2026-58187

CVE-2026-58187 affects the Apache Traffic Server multiplexer plugin. The issue overruns the plugin’s chunk-decode buffer using upstream input, enabling a denial of service. Affected versions are 8.0.0–8.1.9, 9.0.0–9.2.14, and 10.0.0–10.1.3. Apache recommends upgrading to 9.2.15 or 10.1.4, which c...

CVE-2026-58187 Apache Traffic Server: Multiplexer plugin chunk decoder enables a denial of service

The Apache Traffic Server multiplexer plugin overruns its chunk-decode buffer on upstream input, enabling denial of service. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3. Users are recommended to upgrade to version 9.2....