---
id: CVE-2026-47256
title: >-
  OpenTelemetry, also known as OTel, is a vendor-neutral open source
  Observability framework for instrumenting, generating, collecting, and
  exporting telemetry data such as traces, metrics, and logs
summary: >-
  OpenTelemetry, also known as OTel, is a vendor-neutral open source
  Observability framework for instrumenting, generating, collecting, and
  exporting telemetry data such as traces, metrics, and logs. Prior to 0.154.0,
  the Sentry exporter r…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-22
  - CWE-74
vendor: open-telemetry
product: opentelemetry-collector-contrib
affected:
  - opentelemetry-collector-contrib < 0.154.0
  - >-
    github.com/open-telemetry/opentelemetry-collector-contrib/exporter/sentryexporter
    < 0.154.0
patched:
  - >-
    github.com/open-telemetry/opentelemetry-collector-contrib/exporter/sentryexporter
    0.154.0
published: '2026-09-14'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T14:23:59.847'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-47256'
references:
  - url: >-
      https://github.com/open-telemetry/opentelemetry-collector-contrib/commit/3113638f216143f523b57f447728464337ae4903
    label: security-advisories@github.com
  - url: >-
      https://github.com/open-telemetry/opentelemetry-collector-contrib/releases/tag/v0.154.0
    label: security-advisories@github.com
  - url: >-
      https://github.com/open-telemetry/opentelemetry-collector-contrib/security/advisories/GHSA-4jvg-4jfx-fmhc
    label: security-advisories@github.com
  - url: >-
      https://github.com/open-telemetry/opentelemetry-collector-contrib/security/advisories/GHSA-4jvg-4jfx-fmhc
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-4jvg-4jfx-fmhc'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47256.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-47256'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2533233'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-47256'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-47256'
  - url: 'https://access.redhat.com/errata/RHSA-2026:63152'
tags:
  - nvd
  - cve.org
  - exploit-available
  - ghsa
  - go
  - csaf
  - vex
  - red-hat
epss: 0.00437
epssPercentile: 0.3535
ecosystem: go
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T17:59:46.221856Z'
scores:
  nvd: 5.3
  vendor: 6.5
ingestedAt: '2026-06-19T03:39:00.807Z'
---

## Overview

OpenTelemetry, also known as OTel, is a vendor-neutral open source Observability framework for instrumenting, generating, collecting, and exporting telemetry data such as traces, metrics, and logs. Prior to 0.154.0, the Sentry exporter reads the remote OTLP sender-controlled service.name resource attribute in exporter/sentryexporter/sentry_exporter.go through extractProjectSlug and getOrCreateProjectEndpoint, passes the raw project slug to GetOTLPEndpoints and GetProjectKeys in exporter/sentryexporter/sentry_client.go, and interpolates it into a Sentry API URL without applying projectSlugRegexp through validateRoutingConfig at runtime in exporter/sentryexporter/config.go. Special characters can turn the expected path suffix into query data in all deployments or introduce slash and dot segments that traverse paths when the Sentry deployment normalizes them, while the Collector attaches its operator-configured bearer token to the request. A successful request can reach token-authorized administrative, organization, member, or key endpoints within the configured Sentry organization, and an attacker-controlled project slug can redirect subsequently exported telemetry. Sentry token middleware prevents cross-organization access. This issue is fixed in version 0.154.0.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-47256)

Affected packages:

- `github.com/open-telemetry/opentelemetry-collector-contrib/exporter/sentryexporter < 0.154.0`

Patched in:

- `github.com/open-telemetry/opentelemetry-collector-contrib/exporter/sentryexporter 0.154.0`

Source: https://github.com/advisories/GHSA-4jvg-4jfx-fmhc

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Hardened Images · no fix planned: Red Hat Hardened Images · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47256.json)
- **RHSA-2026:63152** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:63152)