{"answers":{"affected":"4 open source packages ship an affected version, including github.com/swift-otel/swift-w3c-trace-context and github.com/swift-otel/swift-otel.","exploited":"There is no known exploitation of CVE-2026-23886 in the wild and no public exploit code.","fix":"Upgrade github.com/swift-otel/swift-w3c-trace-context to 1.0.0-beta.5 or later.","what":"CVE-2026-23886 is a medium-severity denial of service vulnerability in swift-otel swift-w3c-trace-context, published on 19 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-23886 and fix it if it is affected.\n\nWhat it is: CVE-2026-23886 is a medium-severity denial of service vulnerability in swift-otel swift-w3c-trace-context, published on 19 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-23886 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/swift-otel/swift-w3c-trace-context (SwiftURL): affected all versions; fixed in 1.0.0-beta.5\n- github.com/swift-otel/swift-w3c-trace-context (SwiftURL): affected all versions; fixed in 1.0.0-beta.5\n- github.com/swift-otel/swift-otel (SwiftURL): affected all versions; fixed in 1.0.4\n- github.com/swift-otel/swift-otel (SwiftURL): affected all versions; fixed in 1.0.4\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-23886/ (Markdown: https://insights.sbomify.com/CVE-2026-23886/index.md)","id":"CVE-2026-23886","markdown":"https://insights.sbomify.com/CVE-2026-23886/index.md","name":"CVE-2026-23886","record":{"aliases":["GHSA-mvpq-2v8x-ww6g"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Swift tracing library","requires_auth":"none","summary":"A remote attacker can crash the service by sending a malformed HTTP header, affecting applications using Swift W3C TraceContext or Swift OTel.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-20","name":"Improper Input Validation"}],"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`).","ecosystems":["SwiftURL"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Swift W3C TraceContext has malformed HTTP header that can cause a crash","id":"CVE-2026-23886","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"SwiftURL","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":4,"n_references":4,"next":{"headline":"Group-Office has stored XSS vulnerability via unsanitized filenames","id":"CVE-2026-23887"},"packages":[{"ecosystem":"SwiftURL","fixed":["1.0.4"],"introduced":["0"],"last_affected":[],"package":"github.com/swift-otel/swift-otel","purl":null,"source":"GHSA-mvpq-2v8x-ww6g"},{"ecosystem":"SwiftURL","fixed":["1.0.4"],"introduced":["0"],"last_affected":[],"package":"github.com/swift-otel/swift-otel","purl":"pkg:swift/github.com/swift-otel/swift-otel","source":"GHSA-mvpq-2v8x-ww6g"},{"ecosystem":"SwiftURL","fixed":["1.0.0-beta.5"],"introduced":["0"],"last_affected":[],"package":"github.com/swift-otel/swift-w3c-trace-context","purl":null,"source":"GHSA-mvpq-2v8x-ww6g"},{"ecosystem":"SwiftURL","fixed":["1.0.0-beta.5"],"introduced":["0"],"last_affected":[],"package":"github.com/swift-otel/swift-w3c-trace-context","purl":"pkg:swift/github.com/swift-otel/swift-w3c-trace-context","source":"GHSA-mvpq-2v8x-ww6g"}],"prev":{"headline":"AlchemyCMS has Authenticated Remote Code Execution (RCE) via eval injection in ResourcesHelper","id":"CVE-2026-23885"},"products":["swift-w3c-trace-context"],"published":"2026-01-19","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-01-21","vendors":["swift-otel"]},"summary":"A remote attacker can crash the service by sending a malformed HTTP header, affecting applications using Swift W3C TraceContext or Swift OTel.","url":"https://insights.sbomify.com/CVE-2026-23886/"}