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Medium 5.3

OpenTelemetry Python: Unbounded tracestate parsing in opentelemetry-api

CVE-2026-114603 First seen on SecPulse

Affected packages

EcosystemPackageAffectedFixed
open-telemetry opentelemetry-python — —
pip opentelemetry-api
< 1.45.1
1.45.1
PyPI opentelemetry-api
< 1.45.1
1.45.1

Fix status by distribution

Fixed packages published by each distribution for this CVE

Original description The description as published by the source.

OpenTelemetry Python provides the Python API and SDK for OpenTelemetry. Prior to 1.45.1, the opentelemetry-api function TraceState.from_header in opentelemetry/trace/span.py, reached through TraceContextTextMapPropagator.extract, parses inbound W3C tracestate headers with an unbounded optional-whitespace regular expression. A malformed header containing a long run of spaces or tabs without a following comma causes quadratic backtracking before the member-count limit is applied. Services using the default W3C Trace Context propagator can therefore spend excessive CPU time on one unauthenticated request when the HTTP server, parser, gateway, or custom carrier accepts a sufficiently large header. The processing can occupy a synchronous worker or delay unrelated requests on the same asynchronous event loop. The impact is limited to availability and does not expose or modify telemetry data or allow code execution. This issue is fixed in version 1.45.1.

Source: CVE.org (CVE Program・cvelistV5) NVD GitHub Advisory

References

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