Nginx
CVE-2026-50270
HIGH
GHSA-74xj-wh4w-vqxc
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionGitHub Advisory
Impact
Datadog tracing libraries that implement W3C baggage propagation parse incoming baggage HTTP headers without enforcing item-count or byte-size limits on the extract path. The DD_TRACE_BAGGAGE_MAX_ITEMS (default 64) and DD_TRACE_BAGGAGE_MAX_BYTES (default 8192) limits were applied only to baggage injection, not extraction. A remote, unauthenticated attacker can send a request whose baggage header contains an arbitrarily large number of comma-separated key-value pairs (or a single very large value). The tracer allocates a hash-map entry for each pair on every request, causing unbounded CPU and memory consumption and enabling a remote Denial of Service against any HTTP service that has the baggage propagation style enabled. The baggage propagation style is enabled by default in most affected tracers, so any internet-facing service that has been instrumented with an affected tracer version is exposed unless the propagation style has been explicitly narrowed.
Patches
This is resolved in version 1.62.0 and later of the dd-trace-java library.
Workarounds
If users cannot upgrade immediately:
- Disable
baggageextraction by removingbaggagefromDD_TRACE_PROPAGATION_STYLE(orDD_TRACE_PROPAGATION_STYLE_EXTRACTif set independently). - Cap the maximum HTTP request header size at an upstream proxy or web server (for example, Apache
LimitRequestFieldSize, Nginxlarge_client_header_buffers, Envoymax_request_headers_kb).
Resources
Related upstream advisories: opentelemetry-go GHSA-mh2q-q3fh-2475 opentelemetry-dotnet GHSA-g94r-2vxg-569j
Articles & Coverage 2
AnalysisAI
Remote denial of service in Datadog's dd-trace-java (dd-java-agent) tracing library affects any HTTP service instrumented with a version below 1.62.0 that has W3C baggage propagation enabled, which is the default. Because the DD_TRACE_BAGGAGE_MAX_ITEMS (64) and DD_TRACE_BAGGAGE_MAX_BYTES (8192) caps were enforced only on baggage injection and not on extraction, a remote unauthenticated attacker can send a single crafted 'baggage' header with a huge number of key-value pairs or one oversized value to exhaust CPU and memory. …
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Recommended ActionAI
Within 24 hours, scan your infrastructure using asset management or APM tools to identify all dd-trace-java instances below version 1.62.0; apply temporary mitigation by setting environment variable DD_TRACE_BAGGAGE_MAX_ITEMS=0 on all instances to disable the vulnerable code path. …
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External POC / Exploit Code
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