CVE-2026-84894CWE-416

CVE-2026-84894

High · published September 28, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
16.1
In the wild
Unconfirmed
What it is

In moxygen before commit 004123dd24c3, MoQSession::dataStreamReadLoop keeps using a stream read handle after reading a FIN, which invalidates the handle under proxygen's WebTransport API. A remote peer can trigger the stale use by opening a data stream that names an unknown track alias and carries the FIN in the same write.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00255 · 16.1th percentile
Weakness
CWE-416 · Use After Free
Published
2026-09-28T23:16Z
References (2)
https://github.com/facebookexperimental/moxygen/commit/004123dd24c30dad6b649163575145f240dabc94 · [email protected]https://www.facebook.com/security/advisories/cve-2026-84894 · [email protected]
EPSS history
Timeline
  • 30 SEP 03:28Z
    EPSS moved — → 0%
    epss
  • 28 SEP 18:40Z
    In moxygen before commit 004123dd24c3, MoQSession::dataStreamReadLoop keeps using a stream read handle after reading a FIN, which invalidates the handle under…
    cvelistv5