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Vulnerabilities CVE-2026-66338

CVE-2026-66338

Medium
Open
TLP:CLEAR

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

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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.

Details

CVSS Score
5.4
EPSS Score
0.17%

7th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
Confidence
90%
Published
Jul 24, 2026
Last Modified
Jul 27, 2026
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