CVE-2022-21698: client_golang is the instrumentation library for Go applications in Prometheus, and the promhttp package in cl

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HIGH 7.5REMOTEWATCHLISTUPGRADEMITIGATEDOWNGRADE

CVE-2022-21698 is a high-severity flaw (CVSS 7.5) affecting client golang, fedora, extra packages for enterprise linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

client_golang is the instrumentation library for Go applications in Prometheus, and the promhttp package in client_golang provides tooling around HTTP servers and clients. In client_golang prior to version 1.11.1, HTTP server is susceptible to a Denial of Service through unbounded cardinality, and potential memory exhaustion, when handling requests with non-standard HTTP methods. In order to be affected, an instrumented software must use any of `

Why this priority

High severity
EPSS top 7%: very likely to be exploited
Remotely exploitable, no login, no user action
On your watchlist

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	6.0% (top 7%)
CISA exploited list	No
Weakness	CWE-400, CWE-770
Published	2022-02-15
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: fedoraproject · prometheus · rdo project

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

Am I affected?

Timeline

2022-02-15 16:15 UTCPublished CVE record published
2026-06-17 04:26 UTCUpdated Record last modified

prometheus client golang UPGRADE

Affected: < 1.11.1

Fixed in: 1.11.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy client-golang || rpm -q client-golang || client-golang --version

2. UPGRADE to 1.11.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade client-golang

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade client-golang

Note

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

fedoraproject fedora MITIGATE

Affected: 34 · 35 · 36 · 37

Fixed in: no fixed release known

Safe to downgrade to: a release before 34

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

fedoraproject extra packages for enterprise linux DOWNGRADE

Affected: 7.0 · 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

1. Check installed version

apt-cache policy extra-packages-for-enterprise-linux || rpm -q extra-packages-for-enterprise-linux || extra-packages-for-enterprise-linux --version

2. No fixed release: DOWNGRADE to a release before 7.0 (Debian / Ubuntu)

apt-cache madison extra-packages-for-enterprise-linux sudo apt install extra-packages-for-enterprise-linux=<VERSION_BEFORE_7.0> sudo apt-mark hold extra-packages-for-enterprise-linux

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list extra-packages-for-enterprise-linux sudo dnf downgrade extra-packages-for-enterprise-linux-<VERSION_BEFORE_7.0> sudo dnf versionlock add extra-packages-for-enterprise-linux

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

rdo project rdo MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

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

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2022-21698?

client golang: upgrade to 1.11.1; fedora: mitigate or apply the listed mitigation; extra packages for enterprise linux: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-21698 being exploited?

CVE-2022-21698 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-2022-21698 affect?

CVE-2022-21698 affects client golang, fedora, extra packages for enterprise linux. Severity is high (CVSS 7.5). client_golang is the instrumentation library for Go applications in Prometheus, and the promhttp package in client_golang provides tooling around HTTP servers and clients. In client_golang prior to version 1.11.1, HTTP server is susceptible

How urgent is CVE-2022-21698?

Priority 60/100. High severity; EPSS top 7%: very likely to be exploited; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Go (Golang) vulnerabilities · Prometheus vulnerabilities

References

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