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CVE-2026-1801 is an HTTP request-smuggling vulnerability in the libsoup HTTP client/server library. The flaw is in the soup_filter_input_stream_read_line() parsing logic for chunked HTTP requests. libsoup accepts malformed chunk headers containing a lone line-feed character where HTTP requires a carriage-return/line-feed sequence. This parsing discrepancy can cause a crafted network message to be interpreted and processed as multiple HTTP requests.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
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4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An HTTP request-smuggling vulnerability in libsoup caused by non-RFC-compliant parsing of chunked-request headers. A remote unauthenticated attacker can send crafted chunked requests that libsoup interprets as multiple HTTP requests, potentially resulting in information disclosure.
A libsoup vulnerability included in NewStart CGSL advisory NS-SA-2026-0100; technical details are not provided.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.