What is CVE-2022-31394?

CVE-2022-31394 is a high-severity vulnerability in Hyper, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2023-02-21.

How severe is CVE-2022-31394?

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

Resource exhaustion in Hyper

CVE-2022-31394

Hyperium Hyper before 0.14.19 does not allow for customization of the max_header_list_size method in the H2 third-party software, allowing attackers to perform HTTP2 attacks.

Published 2023-02-21 · 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: 0.011 (63.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 63.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Hyper

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

github.com/hyperium/hyper/issues/2826 (Exploit, Patch, Issue Tracking, Vendor Advisory)
github.com/hyperium/hyper/pull/2828 (Patch, Issue Tracking)
github.com/hyperium/hyper/compare/v0.14.18...v0.14.19 (Patch)

Frequently asked questions

What is CVE-2022-31394?: CVE-2022-31394 is a high-severity vulnerability in Hyper, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2023-02-21.
How severe is CVE-2022-31394?: High severity. CVSS v3 base score is 7.5 out of 10.