CVE-2026-66338 – Libsoup: libsoup: http request smuggling via permissive chunk-size parsing in soup_body_input_stream_read_chunked()

CVE ID :CVE-2026-66338

Published : July 24, 2026, 11:16 p.m. | 34 minutes ago

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.

Severity: 5.4 | MEDIUM

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