🛡️ CVE-2026-23886 — swift-otel

🟡 CVSS 5.3 — Medium ✅ No Known Exploit CWE-20 NVD
5.3
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Swift W3C TraceContext vulnerable to a malformed HTTP header causing a crash

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)

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability low.

Weakness class

CVE-2026-23886 is classified as CWE-20: Improper Input Validation. The application accepts input without checking that it has the expected form, so malformed values reach code that assumes they are well formed.

Affected software

CVE-2026-23886 is recorded against 3 packages.

  • github.com/swift-otel/swift-otel
  • github.com/swift-otel/swift-w3c-trace-context
  • unknown

Timeline and source

Published on 21 January 2026 and last revised on 3 February 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Package)
github.com (Web)

Details

Severity Medium
CVSS Score 5.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE CWE-20
Public Exploit ✅ No
Source NVD
Published 2026-01-21
Updated 2026-08-12
Modified 2026-02-03
Fix URL N/A

Affected Packages

Software From version Fixed in
github.com/swift-otel/swift-otel — —
github.com/swift-otel/swift-w3c-trace-context — —
unknown — —

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