How severe is CVE-2022-24968?

CVE-2022-24968 has a CVSS score of 5.9/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2022-24968?

CVE-2022-24968 affects the following packages: mellium.im/xmpp (Go). Ecosystems affected: Go.

How do I fix CVE-2022-24968?

Update mellium.im/xmpp to 0.21.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-24968 is resolved across your whole dependency graph.

How do I detect CVE-2022-24968 in my Go dependencies?

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

How do I mitigate CVE-2022-24968 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2022-24968 actively exploited in the wild?

No public exploit code has been indexed for CVE-2022-24968 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-2022-24968?

CVE-2022-24968 has an EPSS (Exploit Prediction Scoring System) score of 0.5%, placing it in the 44th 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.

What type of vulnerability is CVE-2022-24968?

CVE-2022-24968 is classified as CWE-295 (CWE-295). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2022-24968 published, and has it been updated?

CVE-2022-24968 was published on February 11, 2022 and was last updated on October 8, 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

MEDIUM severity

CVE-2022-24968 — xmpp

MEDIUMFix: mellium/xmpp#260

CVE-2022-24968 is a medium-severity (CVSS 5.9) CWE-295 vulnerability in mellium.im/xmpp. A fix is available for mellium.im/xmpp — see the affected versions and patch details below.

Improper Validation of Certificate with Host Mismatch in mellium.im/xmpp/websocket

Also known asGHSA-h289-x5wc-xcv8 GHSA-m658-p24x-p74rGO-2022-0370

Published

Feb 11, 2022

Updated

Oct 8, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.5%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs44th percentile — riskier than 44% of all scored CVEsHighest risk

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

How urgent is this, really

CVE-2022-24968 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected

🐹mellium.im/xmpp

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

Impact

If no TLS configuration is provided by the user, the websocket package constructs its own TLS configuration using recommended defaults. When looking up a WSS endpoint using the DNS TXT record method described in XEP-0156: Discovering Alternative XMPP Connection Methods the ServerName field was incorrectly being set to the name of the server returned by the TXT record request, not the name of the initial server we were attempting to connect to. This means that any attacker that can spoof a DNS record (ie. in the absence of DNSSEC, DNS-over-TLS, DNS-over-HTTPS, or similar technologies) could redirect the user to a server of their choosing and as long as it had a valid TLS certificate for itself the connection would succeed, resulting in a MITM situation.

Patches

All users should upgrade to v0.21.1.

Workarounds

To work around the issue, manually specify a TLS configuration with the correct hostname.

References

For more information

If you have any questions or comments about this advisory:

Reach out on XMPP to [email protected]
Email us at [email protected]

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`mellium.im/xmpp`	≥ 0.18.0&&< 0.21.1	0.21.1`go get mellium.im/xmpp@v0.21.1`

Affected Products

1 product · 1 configurations

Application

xmppmellium

≥ 0.18.0 && < 0.21.1

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for mellium.im/xmpp, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update mellium.im/xmpp to 0.21.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-24968 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### Impact If no TLS configuration is provided by the user, the websocket package constructs its own TLS configuration using recommended defaults. When looking up a WSS endpoint using the DNS TXT record method described in [XEP-0156: Discovering Alternative XMPP Connection Methods](https://xmpp.org/extensions/xep-0156.html) the ServerName field was incorrectly being set to the name of the server returned by the TXT record request, not the name of the initial server we were attempting to connect to. This means that any attacker that can spoof a DNS record (ie. in the absence of DNSSEC, DNS-ove