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CVE-2026-66338

Опубликовано: 05 июн. 2026
Источник: redhat
CVSS3: 5.4
EPSS Низкий

Описание

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.

Отчет

A flaw was found in libsoup where the chunked transfer encoding parser uses strtoul() to parse chunk sizes without strict validation, silently accepting inputs that violate RFC 9112. When libsoup operates behind a strict frontend proxy, this parsing differential can be exploited to smuggle HTTP requests. The practical impact is limited because libsoup servers are rarely deployed in internet-facing infrastructure behind reverse proxies. This issue is distinct from CVE-2026-1801 which covers bare LF tolerance.

Затронутые пакеты

ПлатформаПакетСостояниеРекомендацияРелиз
Red Hat Enterprise Linux 10libsoup3Fix deferred
Red Hat Enterprise Linux 6libsoupFix deferred
Red Hat Enterprise Linux 7libsoupFix deferred
Red Hat Enterprise Linux 8libsoupFix deferred
Red Hat Enterprise Linux 9libsoupFix deferred

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Дополнительная информация

Статус:

Low
Дефект:
CWE-444
https://bugzilla.redhat.com/show_bug.cgi?id=2506950libsoup: libsoup: HTTP Request Smuggling via permissive chunk-size parsing in soup_body_input_stream_read_chunked()

EPSS

Процентиль: 7%
0.00174
Низкий

5.4 Medium

CVSS3

Связанные уязвимости

CVSS3: 5.4
ubuntu
7 дней назад

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.

CVSS3: 5.4
nvd
7 дней назад

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.

CVSS3: 5.4
debian
7 дней назад

A flaw was found in libsoup. The chunked transfer encoding parser uses ...

CVSS3: 5.4
github
7 дней назад

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.

EPSS

Процентиль: 7%
0.00174
Низкий

5.4 Medium

CVSS3