Medium [CVE-2026-103399] HTTP/1 request smuggling via undrained Expect: 100-continue body
This medium-severity Red Hat Linux advisory covers CVE-2026-103399; related products: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
HTTP/1 request smuggling via undrained Expect: 100-continue body. Red Hat rates this moderate (CVSS 5.3).
Weakness: CWE-444.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; and 6 more.
Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat package: libsoup3-devel; Red Hat package: libsoup3-doc; Red Hat package: libsoup3.src; and 2 more.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Mitigation checklist
- To mitigate this do not expose SoupServer to untrusted networks; prefer terminating proxies or internal-only listeners. If SoupServer must sit behind a reverse proxy, disable backend connection reuse/pooling across clients so an undrained body cannot prepend to another client's request.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
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