EUVD-2026-82977
GHSA-ffvg-hfwh-x2pp
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Unauthenticated network reach (PR:N) but meaningful smuggling needs a proxy/backend parsing disagreement (AC:H, S:C); pure integrity impact (I:H, C:N/A:N).
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
Lifecycle Timeline
4DescriptionCVE.org
HTTP/2 and HTTP/3 Extended CONNECT requests are downgraded as regular CONNECT requests
Articles & Coverage 1
AnalysisAI
Improper handling of HTTP/2 and HTTP/3 Extended CONNECT requests in Netty-based services can downgrade them to ordinary CONNECT requests, enabling request-smuggling or desynchronization in deployments where a fronting proxy and backend interpret the downgraded request differently. The issue carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N), meaning unauthenticated remote attackers can affect integrity, though the independent assessment raises attack complexity to High and scope to Changed and limits practical impact to proxy/gateway mismatches on endpoints that accept HTTP/2 or HTTP/3 Extended CONNECT. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a target running an affected Netty-based service that accepts HTTP/2 or HTTP/3 traffic and processes Extended CONNECT (RFC 8441) requests - i.e., a listener with HTTP/2/3 and CONNECT/WebSocket-over-stream support reachable by the attacker. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are mixed and lean toward a moderate, conditional priority rather than an urgent one. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch identified at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every internet-facing and internal service that embeds Netty and either terminates or forwards HTTP/2 or HTTP/3 traffic, and on any endpoint where Extended CONNECT (RFC 8441 over HTTP/2, RFC 9220 over HTTP/3) is not an explicit, tested business requirement, disable Extended CONNECT support at the Netty layer and confirm that fronting proxies, load balancers, and CDNs reject or strip Extended CONNECT rather than silently downgrading it to ordinary CONNECT, so that the front end and back end cannot disagree about request framing. …
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External POC / Exploit Code
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