CVE-2026-121737

INFO Priority: 0.00 BB Relevance: 0/100
Published: 2026-11-11 Modified: 2026-11-11 First seen: 2026-11-11 Status: pending_score

Description

When a remote, unauthenticated HTTP/1.1 client pipelined the start of a second request and then stopped reading, proxygen's coroutine-based HTTP session could free that pipelined stream while resetting the connection's streams on the resulting write timeout, then go on to use it. This can crash the server, leading to denial of service, and may allow memory corruption with further impact. This issue affects proxygen versions prior to v2026.11.09.00.

Affected Software (1)

VendorProductVersion
Facebook proxygen v0.0.0.0 < v2026.11.09.00

Bug Bounty Relevance

0 / 100

CVSS Score

Unscored

EPSS — Exploitation Probability

0.19%
Raw Score 0.001930
Percentile 9.1%
Date 2026-11-14

EPSS Trend

2026-11-14
0.00193
2026-11-13
0.00193
2026-11-12
0.00193

Intelligence Sources

mitre ref →
nvd ref →