7.5
High
CVE-2026-44909 Proxygen lacked a generalized slow-consumer detection mechanism in its core HTTP session layer
Description
Proxygen lacked a generalized slow-consumer detection mechanism in its core HTTP session layer. A remote, unauthenticated attacker could exploit HTTP/2 flow-control by setting SETTINGS_INITIAL_WINDOW_SIZE to 0 or withholding WINDOW_UPDATE frames, causing the server to buffer complete response bodies in memory indefinitely for stalled streams. By opening many simultaneous streams requesting large resources while preventing the server from transmitting responses, an attacker could induce unbounded memory growth leading to service degradation, resource exhaustion, or denial of service. Versions v2017.01.16.00 through v2026.07.20.00 are affected.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Proxygen 2017.01 | 2017.01.16.00 → < 2026.07.20.00 | 2026.07.20.00 |
Other CVEs of Proxygen
The 12 CVEs of Proxygen →
CVE-2026-91096
In proxygen from v2024.10.28.00 until v2026.09.28.00, WebTransportImpl::terminateSessionStreams…
7.5
High
CVE-2026-91095
In proxygen from v2024.10.28.00 until v2026.09.28.00, the HTTPTransaction::onWebTransportUniStream and…
5.3
Medium
CVE-2026-84895
In proxygen from v2026.04.06.00 until v2026.09.28.00, QuicWtSession::closeSession accesses its member fields after…
7.3
High
CVE-2025-55181
Sending an HTTP request/response body with greater than 2^31 bytes triggers an infinite loop in…
5.3
Medium