Summary
swift-nio-http2 affected by HTTP/2 MadeYouReset vulnerability
The HTTP/2 MadeYouReset vulnerability has a mild effect on swift-nio-http2.
swift-nio-http2 mostly protects against MadeYouReset by using a number of existing denial-of-service prevention patterns that we added in response to the RapidReset vulnerabilities. The result is that servers are not vulnerable to naive attacks based on MadeYouReset, and the naive PoC examples do not affect swift-nio-http2.
However, in 1.38.0 we added some defense-in-depth measures as a precautionary measure that detect clients behaving "weirdly". These defense in depth measures tackle resource drain attacks where attackers interleave attack traffic with legitimate traffic to try to evade our existing DoS prevention mechanisms.
We recommend all adopters move to 1.38.0 as soon as possible to mitigate against more sophisticated attacks that may appear in the future.
We are very grateful to @galbarnahum, @AnatBB, and @YanivRL for their reporting and assistance with our process.
Impact
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Frequently Asked Questions
- What is GHSA-XVR7-P2C6-J83W? GHSA-XVR7-P2C6-J83W is a medium-severity security vulnerability in github.com/apple/swift-nio-http2 (swift), affecting versions < 1.38.0. It is fixed in 1.38.0.
- Which versions of github.com/apple/swift-nio-http2 are affected by GHSA-XVR7-P2C6-J83W? github.com/apple/swift-nio-http2 (swift) versions < 1.38.0 is affected.
- Is there a fix for GHSA-XVR7-P2C6-J83W? Yes. GHSA-XVR7-P2C6-J83W is fixed in 1.38.0. Upgrade to this version or later.
- Is GHSA-XVR7-P2C6-J83W exploitable, and should I be worried? Whether GHSA-XVR7-P2C6-J83W is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether GHSA-XVR7-P2C6-J83W is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix GHSA-XVR7-P2C6-J83W? Upgrade
github.com/apple/swift-nio-http2to 1.38.0 or later.