CVE-2026-23886— Swift W3C TraceContext has malformed HTTP header that can cause a crash
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I. Basic Information for CVE-2026-23886
Vulnerability Information
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Vulnerability Title
Swift W3C TraceContext has malformed HTTP header that can cause a crash
Source: NVD (National Vulnerability Database)
Vulnerability Description
Swift W3C TraceContext is a Swift implementation of the W3C Trace Context standard, and Swift OTel is an OpenTelemetry Protocol (OTLP) backend for Swift Log, Swift Metrics, and Swift Distributed Tracing. Prior to Swift W3C TraceContext version 1.0.0-beta.5 and Swift OTel version 1.0.4, a denial-of-service vulnerability due to improper input validation allows a remote attacker to crash the service via a malformed HTTP header. This 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. Version 1.0.0-beta.5 of Swift W3C TraceContext and version 1.0.4 of Swift OTel contain a patch for this issue. As a workaround, disable either Swift OTel or the code that extracts the trace information from an incoming header (such as a `TracingMiddleware`).
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Swift W3C TraceContext 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Swift W3C TraceContext是Swift OTel开源的一个微型库。 Swift W3C TraceContext 1.0.0-beta.5之前版本和Swift OTel 1.0.4之前版本存在输入验证错误漏洞，该漏洞源于输入验证不当，可能导致远程攻击者通过格式错误的HTTP标头使服务崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| swift-otel | swift-w3c-trace-context | swift-otel < 1.0.4 | - |
II. Public POCs for CVE-2026-23886
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same weakness: CWE-20
V. Comments for CVE-2026-23886
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