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CVE-2026-48504— OpenTelemetry Rust: Unbounded memory allocation in W3C Baggage propagation

Quick assessment

Affected
open-telemetry opentelemetry-rust
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenTelemetry - CNCF OpenTelemetry Rust是OpenTelemetry - CNCF组织的一个OpenTelemetry的Rust实现库。 OpenTelemetry - CNCF OpenTelemetry Rust 0.32.1之前版本存在资源管理错误漏洞，该漏洞源于在解析入站baggage标头前未强制执行W3C Baggage大小限制，可能导致大型攻击者控制的标头造成不必要的CPU工作和短时堆分配。

CVSS 5.3 · Medium EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
open-telemetry opentelemetry-rust < 0.32.1 affected
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I. Basic Information for CVE-2026-48504

Vulnerability Information
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Vulnerability Title
OpenTelemetry Rust: Unbounded memory allocation in W3C Baggage propagation
Source: CVE Program / CVE List V5
Vulnerability Description
OpenTelemetry Rust is the Rust OpenTelemetry implementation. In 0.32.0 and earlier, BaggagePropagator::extract_with_context in opentelemetry_sdk did not enforce W3C Baggage size limits before parsing an inbound baggage header, so a large attacker-controlled header could cause unnecessary CPU work and short-lived heap allocations while parsing entries later discarded by the SDK's baggage storage limits. Services that accept untrusted inbound propagation headers may experience increased per-request resource usage when processing oversized baggage headers. This issue is fixed in version 0.32.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
OpenTelemetry - CNCF OpenTelemetry Rust 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenTelemetry - CNCF OpenTelemetry Rust是OpenTelemetry - CNCF组织的一个OpenTelemetry的Rust实现库。 OpenTelemetry - CNCF OpenTelemetry Rust 0.32.1之前版本存在资源管理错误漏洞，该漏洞源于在解析入站baggage标头前未强制执行W3C Baggage大小限制，可能导致大型攻击者控制的标头造成不必要的CPU工作和短时堆分配。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-telemetry opentelemetry-rust < 0.32.1 -

II. Public POCs for CVE-2026-48504

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III. Intelligence Information for CVE-2026-48504

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Patches & Fixes for CVE-2026-48504 (1)

Vendor Advisories for CVE-2026-48504 (1)

IV. Related Vulnerabilities

Same vendor: open-telemetry
Same weakness: CWE-770

V. Comments for CVE-2026-48504

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