Bug 2512093 (CVE-2026-48521) - CVE-2026-48521 envoy: envoy: HTTP/3 null transport socket options dereference during connection-pool selection
Summary: CVE-2026-48521 envoy: envoy: HTTP/3 null transport socket options dereference...
Keywords:
Status: NEW
Alias: CVE-2026-48521
Deadline: 2026-08-26
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
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 16:26 UTC (History)
2 users (show)

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

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Description OSIDB Bzimport 2026-08-06 15:01:37 UTC 
An abnormal process termination during ALPN-based HTTP/3 connection-pool selection. Envoy could dereference null transport socket options while selecting the HTTP/3 connectivity grid. The fix checks that the options exist before accessing HTTP/1.1 proxy information.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H (5.9)

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