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A flaw was found in SoupServer (libsoup). When an HTTP/1.x client sends a request with Expect: 100-continue and a request body, and SoupServer returns an early final (non-1xx) response before the body is read, the server neither drains the declared body bytes nor closes the connection. On a keep-alive connection, those leftover bytes are interpreted as a subsequent HTTP request. A remote, unauthenticated attacker can place a complete HTTP request in the body and cause SoupServer to process that smuggled request, leading to unintended request handling.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade libsoup-debuginfoUpgrade libsoupUpgrade libsoup-devel | Oct 19, 2026 | Oct 19, 2026 |
| Amazon_linux_2023 | — | Upgrade libsoup-debugsourceUpgrade libsoup3-docUpgrade libsoup3-debugsourceUpgrade libsoup3-develUpgrade libsoupUpgrade libsoup-docUpgrade libsoup3-debuginfoUpgrade libsoup-develUpgrade libsoup3Upgrade libsoup-debuginfo | Oct 13, 2026 | Sep 30, 2026 |
| Redhat_linux | — | No solution exists | Oct 5, 2026 | Sep 29, 2026 |
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