Bug 2512088 (CVE-2026-73512) - CVE-2026-73512 envoy: envoy: HTTP/3 use-after-free when processing late datagrams
Summary: CVE-2026-73512 envoy: envoy: HTTP/3 use-after-free when processing late datag...
Keywords:
Status: NEW
Alias: CVE-2026-73512
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 16:21 UTC (History)
2 users (show)

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

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Description OSIDB Bzimport 2026-08-06 15:01:17 UTC 
A use-after-free in the QUIC HTTP datagram handler. A request that used the Capsule Protocol could have its stream decoder destroyed or replaced while late HTTP/3 datagrams still referenced it, for example following an internal redirect or stream completion. The fix replaces the cached raw decoder pointer with a weak decoder provider.

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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