CVE-2026-91096

EUVD-2026-88545
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
MetaCNA
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 17.19%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources (CNA/ADP records, vendor advisories, Enginsight analysis).
VendorProductVersionSource
facebookproxygen
2024.10.28.0 ≤
𝑥
< 2026.9.28.0
CNA
Common Weakness Enumeration
References
https://github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083
https://www.facebook.com/security/advisories/cve-2026-91096