CVE-2020-15049: Fedoraproject Fedora

High severity, CVSS 8.8. EPSS: 5.7% chance of exploitation in the next 30 days.

An issue was discovered in http/ContentLengthInterpreter.cc in Squid before 4.12 and 5.x before 5.0.3. A Request Smuggling and Poisoning attack can succeed against the HTTP cache. The client sends an HTTP request with a Content-Length header containing "+\ "-" or an uncommon shell whitespace character prefix to the length field-value.

Affected products

• Fedoraproject Fedora: version 31 only
• Squid-Cache Squid: from 2.0, up to and including 2.6; from 3.1, up to and including 3.5.28; from 4.0, before 4.12 (fixed in 4.12); from 5.0, before 5.0.3 (fixed in 5.0.3); version 2.7 only

Published 2020-06-30. Last modified 2026-06-17.