CVE-2026-84895
High
Description
In proxygen from v2026.04.06.00 until v2026.09.28.00, QuicWtSession::closeSession accesses its member fields after calling the base QuicWtSessionBase::closeSession method. The base method notifies the session handler, which may release the last reference to the session and destroy it.
SeverityHigh
CVSS7.3
Exploit probability—
ProductFacebook Proxygen
PublishedSep 28, 2026
First seenSep 28, 2026
Weakness typeCWE-416Use after free
How to fix
Update
- Facebook proxygenv2026.09.28.00 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Facebook proxygen | v2026.04.06.00 ≤ v < v2026.09.28.00 | v2026.09.28.00 |
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