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Fencer Vulns
medium —

GHSA-xvr7-p2c6-j83w json

swift-nio-http2 affected by HTTP/2 MadeYouReset vulnerability

published 2025-08-13 14 mo ago modified 2025-08-13 14 mo ago

cvss
—
not scored
cisa kev
Not listed
not in CISA's catalog
epss
—
no score, EPSS covers CVEs only
public exploits
0
none known

Summary

The HTTP/2 [MadeYouReset vulnerability](https://galbarnahum.com/made-you-reset) 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.

Patch / fix

  • swift github.com/apple/swift-nio-http2 1.38.0

Affected packages

ecosystem package affected fixed in
swift github.com/apple/swift-nio-http2
<1.38.0
1.38.0

Classification

Weakness
  • CWE-405 Asymmetric Resource Consumption (Amplification)

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.