How severe is CVE-2022-27664?

CVE-2022-27664 has a CVSS score of 7.5/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2022-27664?

CVE-2022-27664 affects the following packages: golang.org/x/net (Go), golang.org/x/net/http2 (Go). Ecosystems affected: Go.

How do I fix CVE-2022-27664?

Update golang.org/x/net to 0.0.0-20220906165146-f3363e06e74c or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-27664 is resolved across your whole dependency graph.

How do I detect CVE-2022-27664 in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for golang.org/x/net, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2022-27664 if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is CVE-2022-27664 actively exploited in the wild?

No public exploit code has been indexed for CVE-2022-27664 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2022-27664?

CVE-2022-27664 has an EPSS (Exploit Prediction Scoring System) score of 3.5%, placing it in the 89th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

When was CVE-2022-27664 published, and has it been updated?

CVE-2022-27664 was published on September 6, 2022 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹

🐹 Go

Not in CISA KEV

HIGH severity

CVE-2022-27664 — x/net

HIGH

CVE-2022-27664 is a high-severity (CVSS 7.5) vulnerability in golang.org/x/net. A fix is available for golang.org/x/net — see the affected versions and patch details below.

golang.org/x/net/http2 Denial of Service vulnerability

Also known asBIT-golang-2022-27664GHSA-69cg-p879-7622GO-2022-0969

Published

Sep 6, 2022

Updated

Oct 28, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

3.5%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs89th percentile — riskier than 89% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected

🐹golang.org/x/net🐹golang.org/x/net/http2

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

In net/http in Go before 1.18.6 and 1.19.x before 1.19.1, attackers can cause a denial of service because an HTTP/2 connection can hang during closing if shutdown were preempted by a fatal error.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`golang.org/x/net`	all versions	0.0.0-20220906165146-f3363e06e74c`go get golang.org/x/net@v0.0.0-20220906165146-f3363e06e74c`
🐹Go	`golang.org/x/net/http2`	all versions	0.0.0-20220906165146-f3363e06e74c`go get golang.org/x/net/http2@v0.0.0-20220906165146-f3363e06e74c`

Affected Products

2 products · 4 configurations

fedorafedoraproject

2 versions

3637

Application

gogolang

< 1.18.6

1 version

1.19.0

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for golang.org/x/net, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update golang.org/x/net to 0.0.0-20220906165146-f3363e06e74c or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-27664 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

The opportunity for a Denial of Service is limited to the golang runtime. In the case of OpenShift Container Platform, this would be restricted within each individual container. There are multiple layers of guide rails (Golang’s Garbage Collector; OpenShift’s resource constraints imposed at the container and cluster…

Product	Fixed in	Advisory
OADP-1.1-RHEL-8	`oadp/oadp-velero-rhel8:1.1.1-20`	RHSA-2022:8634
OpenShift Custom Metrics Autoscaler 2	`custom-metrics-autoscaler-tech-preview/custom-metrics-autoscaler-rhel8:2.8.2-143`	RHSA-2023:1042
Openshift Serverless 1 on RHEL 8	`openshift-serverless-clients-0:1.6.1-1.el8`	RHSA-2023:0708
OSSO-1.1-RHEL-8	`openshift-secondary-scheduler-operator/secondary-scheduler-operator-rhel8:v1.1-26`	RHSA-2023:0584
Red Hat Ceph Storage 6.1	`rhceph/rhceph-6-dashboard-rhel9:6-75`	RHSA-2023:3642
Red Hat Enterprise Linux 8	`git-lfs-0:2.13.3-3.el8_6`	RHSA-2022:7129
Red Hat Enterprise Linux 8	`go-toolset:rhel8-8070020230116141618.ded9a3e2`	RHSA-2023:0446
Red Hat Enterprise Linux 8	`container-tools:rhel8-8080020230321153727.0f77c1b7`	RHSA-2023:2758

Frequently Asked Questions

In net/http in Go before 1.18.6 and 1.19.x before 1.19.1, attackers can cause a denial of service because an HTTP/2 connection can hang during closing if shutdown were preempted by a fatal error.

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