CVE-2026-66338
MEDIUM
NVD
CVSS Score
5.4
Severity
MEDIUM
Published
Jul 24, 2026
Vendor
unknown
Description
A flaw was found in libsoup. The chunked transfer encoding parser uses a permissive parsing function for chunk sizes that silently accepts inputs violating RFC 9112, including leading whitespace, plus sign prefixes, and trailing invalid characters. When libsoup operates behind a strict frontend proxy, this parsing differential can be exploited to smuggle HTTP requests.