CVE-2026-84895CWE-416

CVE-2026-84895

High · published September 29, 2026

CVSS v3.1
7.3
EPSS
0%
Percentile
8.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.3 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00195 · 8.7th percentile
Weakness
CWE-416 · Use After Free
Published
2026-09-29T01:17Z
References (2)
https://github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083 · [email protected]https://www.facebook.com/security/advisories/cve-2026-84895 · [email protected]
EPSS history
Timeline
  • 30 SEP 03:28Z
    EPSS moved — → 0%
    epss
  • 28 SEP 20:44Z
    In proxygen from v2026.04.06.00 until v2026.09.28.00, QuicWtSession::closeSession accesses its member fields after calling the base…
    cvelistv5