Bug 2512097 (CVE-2026-73550) - CVE-2026-73550 envoy: envoy: HTTP/2 memory exhaustion via discarded Host headers not counted in limits
Summary: CVE-2026-73550 envoy: envoy: HTTP/2 memory exhaustion via discarded Host head...
Keywords:
Status: NEW
Alias: CVE-2026-73550
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 15:01:55 UTC 
An HTTP/2 memory-exhaustion issue where discarded duplicate Host headers were not included in request-header size and count limits. A downstream client could use repeated indexed Host values to cause excessive header copying and potentially terminate the Envoy process. Discarded Host headers are now included in the applicable limits.

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

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