CVE-2022-37454: The Keccak XKCP SHA-3 reference implementation before fdc6fef has an integer overflow and resultant buffer ove

Q: How do I fix CVE-2022-37454?

extended keccak code package: mitigate or apply the listed mitigation; debian linux: mitigate or apply the listed mitigation; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2022-37454 being exploited?

CVE-2022-37454 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-2022-37454 affect?

CVE-2022-37454 affects extended keccak code package, debian linux, fedora. Severity is critical (CVSS 9.8). The Keccak XKCP SHA-3 reference implementation before fdc6fef has an integer overflow and resultant buffer overflow that allows attackers to execute arbitrary code or eliminate expected cryptographic properties. This occurs in the sponge fu

Q: How urgent is CVE-2022-37454?

Priority 76/100. Critical severity; EPSS top 6%: very likely to be exploited; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

This week

CRITICAL 9.8REMOTEWATCHLISTMITIGATEMITIGATEMITIGATE

CVE-2022-37454 is a critical-severity flaw (CVSS 9.8) affecting extended keccak code package, debian linux, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Keccak XKCP SHA-3 reference implementation before fdc6fef has an integer overflow and resultant buffer overflow that allows attackers to execute arbitrary code or eliminate expected cryptographic properties. This occurs in the sponge function interface.

Why this priority

Critical severity
EPSS top 6%: very likely to be exploited
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	7.4% (top 6%)
CISA exploited list	No
Weakness	CWE-190
Published	2022-10-21
Last modified	2026-10-14

Publisher (CNA): MITRE · Vendor: debian · extended keccak code package project · fedoraproject · php · python · sha3 project

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-10-21 06:15 UTCPublished CVE record published
2026-10-14 18:17 UTCUpdated Record last modified

extended keccak code package project extended keccak code package 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 extended-keccak-code-package || rpm -q extended-keccak-code-package || extended-keccak-code-package --version

No fixed or unaffected release known

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

debian debian linux MITIGATE

Affected: 10.0 · 11.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.0

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 fedora MITIGATE

Affected: 35 · 36

Fixed in: no fixed release known

Safe to downgrade to: a release before 35

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.

php php UPGRADE

Affected: >= 7.2.0 and < 7.4.33 · >= 8.0.0 and < 8.0.25 · >= 8.1.0 and < 8.1.12

Fixed in: 7.4.33, 8.0.25, 8.1.12

Safe to downgrade to: a release before 7.2.0

1. Check installed version

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

2. UPGRADE to 7.4.33 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade php

Note

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

3. If no update is available yet, DOWNGRADE to a release before 7.2.0 (Debian / Ubuntu)

apt-cache madison php sudo apt install php=<VERSION_BEFORE_7.2.0> sudo apt-mark hold php

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list php sudo dnf downgrade php-<VERSION_BEFORE_7.2.0> sudo dnf versionlock add php

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.

python python UPGRADE

Affected: >= 3.6.0 and < 3.7.16 · >= 3.8.0 and < 3.8.16 · >= 3.9.0 and < 3.9.16 · >= 3.10.0 and < 3.10.9

Fixed in: 3.7.16, 3.8.16, 3.9.16, 3.10.9

Safe to downgrade to: a release before 3.6.0

1. Check installed version

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

2. UPGRADE to 3.7.16 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade python

Note

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

3. If no update is available yet, DOWNGRADE to a release before 3.6.0 (Debian / Ubuntu)

apt-cache madison python sudo apt install python=<VERSION_BEFORE_3.6.0> sudo apt-mark hold python

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list python sudo dnf downgrade python-<VERSION_BEFORE_3.6.0> sudo dnf versionlock add python

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.

sha3 project sha3 UPGRADE

Affected: < 1.0.5

Fixed in: 1.0.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy sha3 || rpm -q sha3 || sha3 --version

2. UPGRADE to 1.0.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade sha3

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade sha3

Note

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

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Python (pip) · pysha3 · NO FIX YET · vulnerable: <= 1.0.2 · source

RubyGems · sha3 · FIXED · 1.0.5 · vulnerable: < 1.0.5 · source

bundle update sha3 bundle list | grep sha3

Fedora ELN · libslirp · FIXED · 4.9.7-1.eln159 · FEDORA-2026-209cb94e13 · source

sudo dnf upgrade --advisory=FEDORA-2026-209cb94e13

Fedora 46 · modpoll · FIXED · 1.6.1-1.fc46 · FEDORA-2026-60d403ff15 · source

sudo dnf upgrade --advisory=FEDORA-2026-60d403ff15

Ubuntu 22.04 · php8.1 · FIXED · 8.1.2-1ubuntu2.8

sudo apt update && sudo apt install --only-upgrade php8.1 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' php8.1)" ge "8.1.2-1ubuntu2.8" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 20.04 · pypy3 · FIXED · 7.3.1+dfsg-4ubuntu0.1

sudo apt update && sudo apt install --only-upgrade pypy3 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' pypy3)" ge "7.3.1+dfsg-4ubuntu0.1" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 22.04 · pypy3 · FIXED · 7.3.9+dfsg-1ubuntu0.1

sudo apt update && sudo apt install --only-upgrade pypy3 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' pypy3)" ge "7.3.9+dfsg-1ubuntu0.1" && echo PATCHED || echo STILL-VULNERABLE

Ubuntu 24.04 · pypy3 · NOT AFFECTED

Ubuntu 24.10 · pypy3 · NOT AFFECTED

Debian 12 · pypy3 · FIXED · 7.3.9+dfsg-5

sudo apt update && sudo apt install --only-upgrade pypy3 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' pypy3)" ge "7.3.9+dfsg-5" && echo PATCHED || echo STILL-VULNERABLE

Debian 13 · pypy3 · FIXED · 7.3.9+dfsg-5

sudo apt update && sudo apt install --only-upgrade pypy3 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' pypy3)" ge "7.3.9+dfsg-5" && echo PATCHED || echo STILL-VULNERABLE

RHEL 9 · php · FIXED · php-8.0.27-1.el9_1

sudo dnf upgrade --advisory=RHSA-2023:0965 rpm -q php

RHEL 6 · php · DEFERRED

RHEL 6 · python · NOT AFFECTED

RHEL 7 · php · DEFERRED

RHEL 7 · python · NOT AFFECTED

Alpine 3.20 · php82 · FIXED · php82-8.2.0_rc5-r0

apk add --upgrade php82 apk info -v php82

Alpine 3.21 · php82 · FIXED · php82-8.2.0_rc5-r0

apk add --upgrade php82 apk info -v php82

Alpine 3.22 · php82 · FIXED · php82-8.2.0_rc5-r0

apk add --upgrade php82 apk info -v php82

Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2023-081 · source

sudo dnf update --advisory=ALAS2023-2023-081

Amazon Linux 2 · see advisory · FIXED · ALAS2-2022-1897 · source

sudo yum update --advisory=ALAS2-2022-1897

Amazon Linux 1 · see advisory · FIXED · ALAS-2022-1652 · source

sudo yum update --advisory=ALAS-2022-1652

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: mouha.be/sha-3-buffer-overflow/

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-2022-37454?

extended keccak code package: mitigate or apply the listed mitigation; debian linux: mitigate or apply the listed mitigation; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-37454 being exploited?

CVE-2022-37454 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-2022-37454 affect?

CVE-2022-37454 affects extended keccak code package, debian linux, fedora. Severity is critical (CVSS 9.8). The Keccak XKCP SHA-3 reference implementation before fdc6fef has an integer overflow and resultant buffer overflow that allows attackers to execute arbitrary code or eliminate expected cryptographic properties. This occurs in the sponge fu

How urgent is CVE-2022-37454?

Priority 76/100. Critical severity; EPSS top 6%: very likely to be exploited; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action; On your watchlist

Software pages

PHP vulnerabilities · Python vulnerabilities · Debian vulnerabilities

References

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