Medium severity5.4NVD Advisory· Published Jul 24, 2026· Updated Aug 24, 2026
CVE-2026-66338
CVE-2026-66338
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.
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Affected products
1Patches
Vulnerability mechanics
References
2- bugzilla.redhat.com/show_bug.cginvdExploitIssue TrackingVendor Advisory
- access.redhat.com/security/cve/CVE-2026-66338nvdVendor Advisory
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