Bug 2512096 (CVE-2026-73548) - CVE-2026-73548 envoy: envoy: connection poisoning through generic non-WebSocket HTTP upgrade requests
Summary: CVE-2026-73548 envoy: envoy: connection poisoning through generic non-WebSock...
Keywords:
Status: NEW
Alias: CVE-2026-73548
Deadline: 2026-08-26
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-06 15:01 UTC by OSIDB Bzimport
Modified: 2026-08-31 16:30 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Description OSIDB Bzimport 2026-08-06 15:01:51 UTC 
Cross-user response poisoning involving generic, non-WebSocket HTTP upgrades. Request payload sent before an upstream accepted the upgrade could be interpreted as a pipelined request and leave a contaminated connection in the shared upstream pool. Envoy now pauses the payload until the upgrade is accepted and prevents rejected connections from being reused.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N (7.5)

Embargoed until 2026-08-26 13:00 GMT per Envoy upstream disclosure. PSIRTSUPT-21132.
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