HTTP Request Smuggling Affecting libsoup package, versions [0,3.6.6)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-LIBSOUP-15218624
- published5 Feb 2026
- disclosed3 Feb 2026
- creditUnknown
Introduced: 3 Feb 2026
CVE-2026-1801 (opens in a new tab)How to fix?
Upgrade libsoup to version 3.6.6 or higher.
Overview
Affected versions of this package are vulnerable to HTTP Request Smuggling due to the flawed logic in soup_filter_input_stream_read_line() function. An attacker can bypass intended access restrictions by sending specially crafted chunked HTTP requests containing lone line feed (LF) characters instead of the required carriage return and line feed (CRLF).