GitHub Advisoryadvisory · SwiftURL

GHSA-mvpq-2v8x-ww6g Swift W3C TraceContext vulnerable to a malformed HTTP header causing a crash

MEDIUM Published 2026-01-21 Modified 2026-01-21 Official page ↗
Aliases
CVE-2026-23886
Ecosystem
SwiftURL
Packages
github.com/swift-otel/swift-w3c-trace-context, github.com/swift-otel/swift-otel
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weaknesses
CWE-20
Reviewed
2026-01-21

Affected packages

• SwiftURL github.com/swift-otel/swift-w3c-trace-context: < 1.0.0-beta.5 → fixed in 1.0.0-beta.5 • SwiftURL github.com/swift-otel/swift-otel: < 1.0.4 → fixed in 1.0.4

Description

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 Swift OTel 1.0.4

Related

Alias · CVE (1)

  • CVE-2026-23886 Swift W3C TraceContext is a Swift implementation of the W3C Trace Context standard, and Swift OTel is an OpenTelemetry Protocol (OTLP)… vulnerability

Weakness · CWE (1)

  • CWE-20 Improper Input Validation weakness

References