GHSA-mvpq-2v8x-ww6g
Swift W3C TraceContext vulnerable to a malformed HTTP header causing a crash
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| SwiftURL | github.com/swift-otel/swift-w3c-trace-context | < 1.0.0-beta.5 | 1.0.0-beta.5 |
| SwiftURL | github.com/swift-otel/swift-otel | < 1.0.4 | 1.0.4 |
Details
As written in the advisory (Markdown source, shown as plain text).
### Impact
A denial-of-service vulnerability due to improper input validation allows a remote attacker to crash the service via a malformed HTTP header.
Allows crashing the process with data coming from the network when used with, for example, an HTTP server. Most common way of using Swift W3C Trace Context is through Swift OTel.
### Patches
https://github.com/swift-otel/swift-w3c-trace-context/commit/5da9b143ba6046734de3fa51dafea28290174e4e
### Workarounds
Disable either Swift OTel or the code that extracts the trace information from an incoming header (such as a `TracingMiddleware`).
### References
[Swift W3C TraceContext 1.0.0-beta.5](https://github.com/swift-otel/swift-w3c-trace-context/releases/tag/1.0.0-beta.5)
[Swift OTel 1.0.4](https://github.com/swift-otel/swift-otel/releases/tag/1.0.4)
References
External links from the advisory. They lead to third-party sites.
- https://github.com/swift-otel/swift-w3c-trace-context/security/advisories/GHSA-mvpq-2v8x-ww6g
- https://nvd.nist.gov/vuln/detail/CVE-2026-23886
- https://github.com/swift-otel/swift-w3c-trace-context/commit/5da9b143ba6046734de3fa51dafea28290174e4e
- https://github.com/swift-otel/swift-otel/releases/tag/1.0.4
- https://github.com/swift-otel/swift-w3c-trace-context
- https://github.com/swift-otel/swift-w3c-trace-context/releases/tag/1.0.0-beta.5