Vulnerability · Published Oct 27, 2026 · Assigned by GitHub_M

CVE-2026-116694OpenTelemetry Python: Unbounded memory allocation in Jaeger baggage propagation

Medium 6.3

In plain English

A medium-severity resource allocation without limits in opentelemetry-python from open-telemetry. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.3Medium

Exploit odds (30 days)0.4%top 68.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

OpenTelemetry Python provides the Python API and SDK for OpenTelemetry. Prior to 1.45.0, JaegerPropagator.extract() in opentelemetry-propagator-jaeger processes inbound uberctx-* baggage values without entry, per-entry byte, or total-byte limits. Services that enable the optional Jaeger propagator can perform unnecessary CPU work and short-lived heap allocations when an untrusted carrier supplies numerous or oversized values, contributing to denial of service when transport-level limits do not constrain the input. Common default Python HTTP server limits reduce the practical impact, while custom getters, non-HTTP transports, or raised header limits increase exposure. This issue is fixed in version 1.45.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:14	python-opentelemetry	1.45.1-1	DEBIAN-CVE-2026-116694
PyPI	opentelemetry-propagator-jaeger	1.45.0	GHSA-f5m9-jfrj-jjj7
Ubuntu:26.04:LTS	python-opentelemetry	no fix listed	UBUNTU-CVE-2026-116694
Ubuntu:26.10	python-opentelemetry	no fix listed	UBUNTU-CVE-2026-116694

Affected products (as reported)

Vendor	Product	Versions
open-telemetry	opentelemetry-python	< 1.45.0

Weakness: CWE-770 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

References

https://github.com/open-telemetry/opentelemetry-python/security/advisories/GHSA-f5m9-jfrj-jjj7 x_refsource_CONFIRM
https://github.com/open-telemetry/opentelemetry-python/pull/5556 x_refsource_MISC
https://github.com/open-telemetry/opentelemetry-python/commit/65c4eeb87cd3815dc795d3b5485e9ea0d5affcc7 x_refsource_MISC
https://github.com/open-telemetry/opentelemetry-python/releases/tag/v1.45.0 x_refsource_MISC