CVE-2022-31394: Hyperium Hyper before 0.14.19 does not allow for customization of the max_header_list_size method in the H2 th

Q: How do I fix CVE-2022-31394?

hyper: upgrade to 0.14.19. Exact commands for each OS are on this page.

Q: Is CVE-2022-31394 being exploited?

CVE-2022-31394 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2022-31394 affect?

CVE-2022-31394 affects hyper. Severity is high (CVSS 7.5). 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.

Q: How urgent is CVE-2022-31394?

Priority 52/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2022-31394 is a high-severity flaw (CVSS 7.5) affecting hyper. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-770
Published	2023-02-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: hyper

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-02-21 14:15 UTCPublished CVE record published
2026-06-17 04:45 UTCUpdated Record last modified

hyper hyper UPGRADE

Affected: < 0.14.19

Fixed in: 0.14.19

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy hyper || rpm -q hyper || hyper --version

2. UPGRADE to 0.14.19 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade hyper

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade hyper

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-31394?

hyper: upgrade to 0.14.19. Exact commands for each OS are on this page.

Is CVE-2022-31394 being exploited?

CVE-2022-31394 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-31394 affect?

CVE-2022-31394 affects hyper. Severity is high (CVSS 7.5). 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.

How urgent is CVE-2022-31394?

Priority 52/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

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CVE-2023-26964 HIGH 7.5 DOWNGRADE DOWNGRADE An issue was discovered in hyper v0.13.7

References

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