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CRITICAL severity

SwiftNIO vulnerable to HTTP request smuggling using malformed Transfer-Encoding headerGHSA-mgc4-wqv7-4pxm

CRITICALFix: apple/swift-nio#1387

GHSA-mgc4-wqv7-4pxm is a critical-severity (CVSS 9.8) vulnerability in github.com/apple/swift-nio. A fix is available for github.com/apple/swift-nio — see the affected versions and patch details below.

Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of May 18, 2023 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

2 pkgs affected
📦github.com/apple/swift-nio📦github.com/apple/swift-nio

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

Description

Impact

Affected SwiftNIO systems are vulnerable to request smuggling attacks, in which they parse a given HTTP message differently from other network parties, potentially seeing a different number of requests than other servers. This can lead to failures of authentication, routing, and other issues.

This vulnerability can be found in the bundled copy of the Node.JS HTTP parser used in the NIOHTTP1 module.

Workarounds

No workaround is available, users must upgrade.

References

https://nodejs.org/en/blog/vulnerability/february-2020-security-releases/#http-request-smuggling-using-malformed-transfer-encoding-header-critical-cve-2019-15605

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
📦SwiftURLgithub.com/apple/swift-nio≥ 1.0.0&&< 1.14.21.14.2
📦SwiftURLgithub.com/apple/swift-nio≥ 2.0.0&&< 2.13.12.13.1

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update github.com/apple/swift-nio to 1.14.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-mgc4-wqv7-4pxm 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

### Impact Affected SwiftNIO systems are vulnerable to request smuggling attacks, in which they parse a given HTTP message differently from other network parties, potentially seeing a different number of requests than other servers. This can lead to failures of authentication, routing, and other issues. This vulnerability can be found in the bundled copy of the Node.JS HTTP parser used in the `NIOHTTP1` module. ### Workarounds No workaround is available, users must upgrade. ### References https://nodejs.org/en/blog/vulnerability/february-2020-security-releases/#http-request-smuggling-usi
O3 Security · Impact-Aware SCA

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SwiftNIO vulnerable to HTTP request smuggling using…