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Misconfiguration
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CVE Vulnerabilities

CVE-2026-48710

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Published: May 26, 2026 | Modified: Jul 02, 2026
CVSS 3.x
6.5
MEDIUM
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS 2.x
RedHat/V2
RedHat/V3
6.5 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-48710
CWEhttps://cwe.mitre.org/data/definitions/444.html

Starlette is a lightweight ASGI framework/toolkit. Prior to version 1.0.1, the HTTP Host request header was not validated before being used to reconstruct request.url. Because the routing algorithm relies on the raw HTTP path while request.url is rebuilt from the Host header, a malformed header could make request.url.path differ from the path that was actually requested. Middleware and endpoints that apply security restrictions based on request.url (rather than the raw scope path) could therefore be bypassed. Users should upgrade to a version greater than or equal to version 1.0.1, which validates the Host header against the grammar of RFC 9112 §3.2 / RFC 3986 §3.2.2 when constructing request.url and falls back to scope[server] for malformed values.

Weakness

The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

Affected Software

NameVendorStart VersionEnd Version
StarletteEncode0.8.3 (including)1.0.1 (excluding)
Red Hat AI Inference Server 3.3RedHatrhaiis/vllm-rocm-rhel9:1782353093*
Red Hat AI Inference Server 3.3RedHatrhaiis/vllm-cuda-rhel9:1782352847*
Red Hat Ansible Automation Platform 2.6RedHatansible-automation-platform-26/lightspeed-chatbot-rhel9:1780102732*
Red Hat Ansible Automation Platform 2.7RedHatansible-automation-platform-27/lightspeed-chatbot-rhel9:1780099185*
Red Hat Satellite 6.18RedHatsatellite/foreman-mcp-server-rhel9:1780492008*
Red Hat Satellite 6.18RedHatsatellite/iop-host-inventory-rhel9:1780414237*
Red Hat Satellite 6.19RedHatsatellite/foreman-mcp-server-rhel9:1780492012*

Extended Description

HTTP requests or responses (“messages”) can be malformed or unexpected in ways that cause web servers or clients to interpret the messages in different ways than intermediary HTTP agents such as load balancers, reverse proxies, web caching proxies, application firewalls, etc. For example, an adversary may be able to add duplicate or different header fields that a client or server might interpret as one set of messages, whereas the intermediary might interpret the same sequence of bytes as a different set of messages. For example, discrepancies can arise in how to handle duplicate headers like two Transfer-encoding (TE) or two Content-length (CL), or the malicious HTTP message will have different headers for TE and CL. The inconsistent parsing and interpretation of messages can allow the adversary to “smuggle” a message to the client/server without the intermediary being aware of it. This weakness is usually the result of the usage of outdated or incompatible HTTP protocol versions in the HTTP agents.

Potential Mitigations

References

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