CVE-2022-39264: nheko is a desktop client for the Matrix communication application

Q: How do I fix CVE-2022-39264?

nheko: upgrade to 0.10.2; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2022-39264 being exploited?

CVE-2022-39264 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-2022-39264 affect?

CVE-2022-39264 affects nheko, fedora. Severity is high (CVSS 8.6). nheko is a desktop client for the Matrix communication application. All versions below 0.10.2 are vulnerable homeservers inserting malicious secrets, which could lead to man-in-the-middle attacks. Users can upgrade to version 0.10.2 to prot

Q: How urgent is CVE-2022-39264?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 8.6REMOTEUPGRADEMITIGATE

CVE-2022-39264 is a high-severity flaw (CVSS 8.6) affecting nheko, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

nheko is a desktop client for the Matrix communication application. All versions below 0.10.2 are vulnerable homeservers inserting malicious secrets, which could lead to man-in-the-middle attacks. Users can upgrade to version 0.10.2 to protect against this issue. As a workaround, one may apply the patch manually, avoid doing verifications of one's own devices, and/or avoid pressing the request button in the settings menu.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-287, CWE-295
Published	2022-09-28
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: fedoraproject · nheko-reborn

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

Am I affected?

Timeline

2022-09-28 22:15 UTCPublished CVE record published
2026-06-17 04:58 UTCUpdated Record last modified

nheko-reborn nheko UPGRADE

Affected: < 0.10.2

Fixed in: 0.10.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.10.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nheko

Note

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

fedoraproject fedora MITIGATE

Affected: 36 · 37

Fixed in: no fixed release known

Safe to downgrade to: a release before 36

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.

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-2022-39264?

nheko: upgrade to 0.10.2; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-39264 being exploited?

CVE-2022-39264 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-2022-39264 affect?

CVE-2022-39264 affects nheko, fedora. Severity is high (CVSS 8.6). nheko is a desktop client for the Matrix communication application. All versions below 0.10.2 are vulnerable homeservers inserting malicious secrets, which could lead to man-in-the-middle attacks. Users can upgrade to version 0.10.2 to prot

How urgent is CVE-2022-39264?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

References

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