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MEDIUM severity

CVE-2016-10027 — smack-core

MEDIUMFix: igniterealtime/Smack@059ee99

CVE-2016-10027 is a medium-severity (CVSS 5.9) CWE-362 vulnerability in org.igniterealtime.smack:smack-core. A fix is available for org.igniterealtime.smack:smack-core — see the affected versions and patch details below.

Smack allows the bypass of TLS protections

Also known asGHSA-66pq-hqv5-228g
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs75th percentile — riskier than 75% of all scored CVEsHighest risk
0.00%0.67%1.35%2.02%0.4%1.5%May 26Sep 26Nov 26

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

1 pkg affected
☕org.igniterealtime.smack:smack-core

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

Description

Race condition in the XMPP library in Smack before 4.1.9, when the SecurityMode.required TLS setting has been set, allows man-in-the-middle attackers to bypass TLS protections and trigger use of cleartext for client authentication by stripping the "starttls" feature from a server response.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.igniterealtime.smack:smack-coreall versions4.1.9org.igniterealtime.smack:smack-core:4.1.9

Affected Products

2 products · 2 configurations
OS
fedorafedoraproject
1 version
25
Application
smackigniterealtime
< 4.1.9
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update org.igniterealtime.smack:smack-core to 4.1.9 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2016-10027 is resolved across your whole dependency graph.

  3. 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

Race condition in the XMPP library in Smack before 4.1.9, when the SecurityMode.required TLS setting has been set, allows man-in-the-middle attackers to bypass TLS protections and trigger use of cleartext for client authentication by stripping the "starttls" feature from a server response.
O3 Security · Impact-Aware SCA

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CVE-2016-10027: smack-core — Fixed in 4.1.9