Impact Prior to version 6.3.1, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies and zero-length Content-Length headers in a way that allowed HTTP request smuggling.

The following vulnerabilities are addressed by this advisory:

Incorrect parsing of trailing fields in chunked transfer encoding bodies Parsing of blank/zero-length Content-Length headers

Patches The vulnerability has been fixed in 6.3.1 and 5.6.7.

Workarounds No known workarounds.

References HTTP Request Smuggling

For more information If you have any questions or comments about this advisory:

Open an issue in Puma See our security policy

Impact Prior to versions 6.4.2 and 5.6.8, puma exhibited dangerous behavior when parsing chunked transfer encoding bodies.

Fixed versions limit the size of chunk extensions. Without this limit, an attacker could cause unbounded resource (CPU, network bandwidth) consumption.

Patches

The vulnerability has been fixed in 6.4.2 and 5.6.8.

Workarounds

No known workarounds.

References

HTTP Request Smuggling Open an issue in Puma See our security policy