The MITRE CVE dictionary describes this issue as:
HTTP response smuggling vulnerability in Mozilla Firefox and Thunderbird before 184.108.40.206, when used with certain proxy servers, allows remote attackers to cause Firefox to interpret certain responses as if they were responses from two different sites via (1) invalid HTTP response headers with spaces between the header name and the colon, which might not be ignored in some cases, or (2) HTTP 1.1 headers through an HTTP 1.0 proxy, which are ignored by the proxy but processed by the client.
Red Hat security errata
|Red Hat Enterprise Linux version 2.1 (seamonkey)||RHSA-2006:0594||August 28, 2006|
|Red Hat Enterprise Linux version 3 (seamonkey)||RHSA-2006:0578||July 20, 2006|
|Red Hat Enterprise Linux version 4||RHSA-2006:0609||August 02, 2006|
|Red Hat Enterprise Linux version 4 (firefox)||RHSA-2006:0610||July 28, 2006|
|Red Hat Enterprise Linux version 4 (thunderbird)||RHSA-2006:0611||July 29, 2006|
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For clarification or corrections please contact the Red Hat Security Response Team.