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CVE-2019-16779 — Vulnerability in excon — CVE Details

MEDIUM

In RubyGem excon, interrupted Persistent Connections May Leak Response Data

Published December 16, 2019Updated September 10, 2026Source: osv

Summary

### Impact There was a race condition around persistent connections, where a connection which is interrupted (such as by a timeout) would leave data on the socket. Subsequent requests would then read this data, returning content from the previous response. The race condition window appears to be short, and it would be difficult to purposefully exploit this. ### Patches The problem has been patched in 0.71.0, users should upgrade to this or a newer version (if one exists). ### Workarounds Users can workaround the problem by disabling persistent connections, though this may cause performance implications. ### References See the [patch](https://github.com/excon/excon/commit/ccb57d7a422f020dc74f1de4e8fb505ab46d8a29) for further details. ### For more information If you have any questions or comments about this advisory: * Open an issue in [excon/issues](https://github.com/excon/excon/issues) * Email us at [geemus+github@gmail.com](mailto:geemus+github@gmail.com)

Advisory Timeline

  • First published December 16, 2019 (2492 days ago).
  • Last revised September 10, 2026 — 2459 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Bundler
Update excon to 0.71.0 or later
gem install excon -v 0.71.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: rubygems (1).

PackageEcosystemAffectedFixed In
excon
rubygems
0.0.1, 0.0.10, 0.0.11, 0.0.12 (+203 more)0.71.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 5.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:N/A:N

Frequently Asked Questions

What is CVE-2019-16779?
In RubyGem excon, interrupted Persistent Connections May Leak Response Data This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 5.8/10).
How do I check if my project is affected by CVE-2019-16779?
CVE-2019-16779 affects excon. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2019-16779 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
5.8

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-q58g-455p-8vw9

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