CVE-2026-91096CWE-416

CVE-2026-91096

High · published September 29, 2026

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

In proxygen from v2024.10.28.00 until v2026.09.28.00, WebTransportImpl::terminateSessionStreams (WebTransportImpl::destroy in releases before v2025.08.18.00) failed to unregister read callbacks for streams that were no longer open before destroying them. The transport could then invoke a read callback that had been freed.

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
2026-09-29T01:17Z
References (2)
https://github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083 · [email protected]https://www.facebook.com/security/advisories/cve-2026-91096 · [email protected]
EPSS history
Timeline
  • 30 SEP 03:29Z
    EPSS moved — → 0%
    epss
  • 28 SEP 20:44Z
    In proxygen from v2024.10.28.00 until v2026.09.28.00, WebTransportImpl::terminateSessionStreams (WebTransportImpl::destroy in releases before v2025.08.18.00)…
    cvelistv5