DEBIAN-CVE-2026-1801
Record from OSV · Published February 3, 2026
A flaw was found in libsoup, an HTTP client/server library. This HTTP Request Smuggling vulnerability arises from non-RFC-compliant parsing in the soup_filter_input_stream_read_line() logic, where libsoup accepts malformed chunk headers, such as lone line feed (LF) characters instead of the required carriage return and line feed (CRLF). A remote attacker can exploit this without authentication or user interaction by sending specially crafted chunked requests. This allows libsoup to parse and process multiple HTTP requests from a single network message, potentially leading to information disclosure.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| libsoup3 | Debian:14 | 3.6.5-8 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Debian:12 | libsoup3 | 3.4.4-5, 3.2.2-2, 3.2.3-0+deb12u1 |
| Debian:14 | libsoup3 | 3.6.5-5, 3.6.5-7, 3.6.5-6 |
| Debian:12 | libsoup2.4 | 2.74.3-11, 2.74.3-2, 2.74.3-3 |
| Debian:13 | libsoup2.4 | 0, 2.74.3-11, 2.74.3-10.1 |
| Debian:13 | libsoup3 | 3.6.5-8, 3.6.5-9, 3.6.6-1 |
Timeline
- Feb 3, 2026 CVE Published
- Oct 1, 2026 CVE Updated
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