What is CVE-2018-6346?

CVE-2018-6346 is a high-severity vulnerability in Facebook Proxygen, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2018-12-31.

How severe is CVE-2018-6346?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Facebook Proxygen

CVE-2018-6346

A potential denial-of-service issue in the Proxygen handling of invalid HTTP2 priority settings (specifically a circular dependency). This affects Proxygen prior to v2018.12.31.00.

Vulnerability class: DoS (Denial of Service)

Published 2018-12-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.014 (70.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 70.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Facebook Proxygen — versions v2018.12.31.00, unspecified
Proxygen Project

Weakness classification (CWE)

References

github.com/facebook/proxygen/commit/52cf331743ebd74194d6343a6c2ec52bb917c982 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2018-6346?: CVE-2018-6346 is a high-severity vulnerability in Facebook Proxygen, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2018-12-31.
How severe is CVE-2018-6346?: High severity. CVSS v3 base score is 7.5 out of 10.