CVE Feed

    Dashboard / CVE / CVE-2026-91095

    CVE-2026-91095

    In proxygen from v2024.10.28.00 until v2026.09.28.00, the HTTPTransaction::onWebTransportUniStream and HTTPTransaction::onWebTransportBidiStream APIs could return stream handles that the stream handler had already freed. HQSession then installed those handles as transport read callbacks, which could lead to use of freed memory.

    Published:Sep 28, 2026
    Last Modified:Oct 1, 2026
    EPS:Sep 28, 2026
    EPSS Score:0.00145
    CVSS Score:5.3

    Affected Products

    Vendor
    Facebook
    Product
    Proxygen

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-91096 (CVSS 7.5) — In proxygen from v2024.10.28.00 until v2026.09.28.00, WebTransportImpl::terminateSessionStreams (WebTransportI…
    CVE-2026-84895 (CVSS 7.3) — In proxygen from v2026.04.06.00 until v2026.09.28.00, QuicWtSession::closeSession accesses its member fields a…
    CVE-2026-44909 (CVSS 7.5) — Proxygen lacked a generalized slow-consumer detection mechanism in its core HTTP session layer. A remote, unau…
    CVE-2025-55181 (CVSS 5.3) — Sending an HTTP request/response body with greater than 2^31 bytes triggers an infinite loop in proxygen::coro…
    CVE-2023-44487 (CVSS 7.5) — The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can …
    CVE-2021-24029 (CVSS 7.5) — A packet of death scenario is possible in mvfst via a specially crafted message during a QUIC session, which c…
    CVE-2020-1897 (CVSS 9.8) — A use-after-free is possible due to an error in lifetime management in the request adaptor when a malicious cl…
    CVE-2019-11940 (CVSS 9.8) — In the course of decompressing HPACK inside the HTTP2 protocol, an unexpected sequence of header table resize …
    CVE-2019-11921 (CVSS 9.8) — An out of bounds write is possible via a specially crafted packet in certain configurations of Proxygen due to…
    CVE-2018-6343 (CVSS 7.5) — Proxygen fails to validate that a secondary auth manager is set before dereferencing it. That can cause a deni…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High