What’s Vulnerable › Vulnerabilities
CVE-2026-54285: opentelemetry-js: Unbounded memory allocation in W3C Baggage propagation
- Severity: medium (CVSS 5.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-22 · updated 2026-10-25
- Weakness: CWE-770
Description
opentelemetry-js is the OpenTelemetry JavaScript Client. Prior to 2.8.0, W3CBaggagePropagator.extract() in @opentelemetry/core does not enforce size limits when parsing inbound baggage HTTP headers. The W3C Baggage specification recommends a maximum of 8,192 bytes and 180 entries; these limits were only enforced on the outbound (inject()) path, not on the inbound (extract()) path. Parsing oversized baggage causes memory allocation proportional to the header size without any cap. This vulnerability is fixed in 2.8.0.
Affected products
- open-telemetry opentelemetry-go: before 2.8.0 — fixed in 2.8.0
How to fix
Upgrade to a fixed version: open-telemetry opentelemetry-go 2.8.0. Check the vendor advisory for mitigations.
References
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