Vulnerability-Lookup

CVE-2026-55701 (GCVE-0-2026-55701)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:05 – Updated: 2026-09-15 15:05

Title

OpenTelemetry githubreceiver silently ignores configured required_headers authentication

Summary

The OpenTelemetry Collector Contrib repository contains components for the OpenTelemetry Collector. Prior to 0.151.0, the githubreceiver validates the receiver/githubreceiver/config.go RequiredHeaders configuration at startup, but receiver/githubreceiver/trace_receiver.go handleReq() does not check those headers on incoming webhook requests. An unauthenticated sender can therefore bypass an operator's required_headers authentication control and submit arbitrary webhook payloads. When the Secret field is empty, github.ValidatePayload also skips HMAC validation, leaving the webhook endpoint without either configured authentication mechanism. Successful exploitation can inject fabricated CI/CD trace data into the observability pipeline. This issue is fixed in version 0.151.0.

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CWE

CWE-863 - Incorrect Authorization

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/open-telemetry/opentelemetry-c…	x_refsource_CONFIRM
https://github.com/open-telemetry/opentelemetry-c…	x_refsource_MISC
https://github.com/open-telemetry/opentelemetry-c…	x_refsource_MISC
https://github.com/open-telemetry/opentelemetry-c…	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version	CPE status
open-telemetry	opentelemetry-collector-contrib	Affected: < 0.151.0	guessed
open-telemetry	github.com/open-telemetry/opentelemetry-collector-contrib/receiver/githubreceiver	Affected: < 0.151.0	guessed

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "opentelemetry-collector-contrib",
          "vendor": "open-telemetry",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.151.0"
            }
          ]
        },
        {
          "product": "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/githubreceiver",
          "vendor": "open-telemetry",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.151.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The OpenTelemetry Collector Contrib repository contains components for the OpenTelemetry Collector. Prior to 0.151.0, the githubreceiver validates the receiver/githubreceiver/config.go RequiredHeaders configuration at startup, but receiver/githubreceiver/trace_receiver.go handleReq() does not check those headers on incoming webhook requests. An unauthenticated sender can therefore bypass an operator\u0027s required_headers authentication control and submit arbitrary webhook payloads. When the Secret field is empty, github.ValidatePayload also skips HMAC validation, leaving the webhook endpoint without either configured authentication mechanism. Successful exploitation can inject fabricated CI/CD trace data into the observability pipeline. This issue is fixed in version 0.151.0."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "LOW"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-15T15:05:15.715Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/open-telemetry/opentelemetry-collector-contrib/security/advisories/GHSA-w5cv-pw74-4rxc",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/open-telemetry/opentelemetry-collector-contrib/security/advisories/GHSA-w5cv-pw74-4rxc"
        },
        {
          "name": "https://github.com/open-telemetry/opentelemetry-collector-contrib/pull/47854",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/open-telemetry/opentelemetry-collector-contrib/pull/47854"
        },
        {
          "name": "https://github.com/open-telemetry/opentelemetry-collector-contrib/commit/54143ccd14f5ebd74ca741739d2099c7fbebbd98",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/open-telemetry/opentelemetry-collector-contrib/commit/54143ccd14f5ebd74ca741739d2099c7fbebbd98"
        },
        {
          "name": "https://github.com/open-telemetry/opentelemetry-collector-contrib/releases/tag/v0.151.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/open-telemetry/opentelemetry-collector-contrib/releases/tag/v0.151.0"
        }
      ],
      "source": {
        "advisory": "GHSA-w5cv-pw74-4rxc",
        "discovery": "UNKNOWN"
      },
      "title": "OpenTelemetry githubreceiver silently ignores configured required_headers authentication"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-55701",
    "datePublished": "2026-09-15T15:05:15.715Z",
    "dateReserved": "2026-06-17T00:13:10.651Z",
    "dateUpdated": "2026-09-15T15:05:15.715Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-55701\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-09-15T16:17:15.617\",\"lastModified\":\"2026-09-15T16:17:15.617\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"The OpenTelemetry Collector Contrib repository contains components for the OpenTelemetry Collector. Prior to 0.151.0, the githubreceiver validates the receiver/githubreceiver/config.go RequiredHeaders configuration at startup, but receiver/githubreceiver/trace_receiver.go handleReq() does not check those headers on incoming webhook requests. An unauthenticated sender can therefore bypass an operator\u0027s required_headers authentication control and submit arbitrary webhook payloads. When the Secret field is empty, github.ValidatePayload also skips HMAC validation, leaving the webhook endpoint without either configured authentication mechanism. Successful exploitation can inject fabricated CI/CD trace data into the observability pipeline. This issue is fixed in version 0.151.0.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"open-telemetry\",\"product\":\"opentelemetry-collector-contrib\",\"versions\":[{\"version\":\"\u003c 0.151.0\",\"status\":\"affected\"}]},{\"vendor\":\"open-telemetry\",\"product\":\"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/githubreceiver\",\"versions\":[{\"version\":\"\u003c 0.151.0\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X\",\"baseScore\":6.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"LOW\",\"vulnAvailabilityImpact\":\"NONE\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-863\"}]}],\"references\":[{\"url\":\"https://github.com/open-telemetry/opentelemetry-collector-contrib/commit/54143ccd14f5ebd74ca741739d2099c7fbebbd98\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/open-telemetry/opentelemetry-collector-contrib/pull/47854\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/open-telemetry/opentelemetry-collector-contrib/releases/tag/v0.151.0\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/open-telemetry/opentelemetry-collector-contrib/security/advisories/GHSA-w5cv-pw74-4rxc\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}

GHSA-W5CV-PW74-4RXC

Vulnerability from github – Published: 2026-06-18 15:05 – Updated: 2026-06-18 15:05

Summary

opentelemetry-collector-contrib: githubreceiver silently ignores configured required_headers authentication

Details

githubreceiver Silently Ignores Configured required_headers Authentication

Summary

The githubreceiver webhook handler does not enforce the required_headers configuration. Headers are validated at startup (config rejects empty keys/values) but never checked on incoming requests. This follows the same pattern as GHSA-prf6-xjxh-p698 (awsfirehosereceiver auth bypass). Verified against current main.

Details

In receiver/githubreceiver/config.go, the RequiredHeaders field is defined (line 45) and validated at startup (lines 93-101). But receiver/githubreceiver/trace_receiver.go in handleReq() (lines 131-185) never references RequiredHeaders.

The gitlabreceiver enforces the same config correctly at receiver/gitlabreceiver/traces_receiver.go:266-270:

for key, value := range gtr.cfg.WebHook.RequiredHeaders {
    if r.Header.Get(key) != string(value) {
        return "", fmt.Errorf("%w: %s", errInvalidHeader, key)
    }
}

Amplifying factor

The Secret field defaults to empty and has no validation requiring it to be set. With an empty secret, github.ValidatePayload skips HMAC validation entirely. An operator who configures required_headers as their authentication mechanism (without setting secret) has zero authentication on the webhook endpoint.

Impact

An attacker can send arbitrary webhook payloads to the githubreceiver endpoint, bypassing the operator configured authentication. This allows injecting fake CI/CD trace data into the observability pipeline.

Suggested Fix

Add RequiredHeaders enforcement to handleReq(), matching the gitlabreceiver pattern.

Severity

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 0.150.0"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/githubreceiver"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.151.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55701"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-18T15:05:14Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "## githubreceiver Silently Ignores Configured required_headers Authentication\n\n### Summary\n\nThe githubreceiver webhook handler does not enforce the `required_headers` configuration. Headers are validated at startup (config rejects empty keys/values) but never checked on incoming requests. This follows the same pattern as [GHSA-prf6-xjxh-p698](https://github.com/open-telemetry/opentelemetry-collector-contrib/security/advisories/GHSA-prf6-xjxh-p698) (awsfirehosereceiver auth bypass). Verified against current main.\n\n### Details\n\nIn `receiver/githubreceiver/config.go`, the `RequiredHeaders` field is defined (line 45) and validated at startup (lines 93-101). But `receiver/githubreceiver/trace_receiver.go` in `handleReq()` (lines 131-185) never references `RequiredHeaders`.\n\nThe gitlabreceiver enforces the same config correctly at `receiver/gitlabreceiver/traces_receiver.go:266-270`:\n\n    for key, value := range gtr.cfg.WebHook.RequiredHeaders {\n        if r.Header.Get(key) != string(value) {\n            return \"\", fmt.Errorf(\"%w: %s\", errInvalidHeader, key)\n        }\n    }\n\n### Amplifying factor\n\nThe `Secret` field defaults to empty and has no validation requiring it to be set. With an empty secret, `github.ValidatePayload` skips HMAC validation entirely. An operator who configures `required_headers` as their authentication mechanism (without setting `secret`) has zero authentication on the webhook endpoint.\n\n### Impact\n\nAn attacker can send arbitrary webhook payloads to the githubreceiver endpoint, bypassing the operator configured authentication. This allows injecting fake CI/CD trace data into the observability pipeline.\n\n### Suggested Fix\n\nAdd RequiredHeaders enforcement to `handleReq()`, matching the gitlabreceiver pattern.",
  "id": "GHSA-w5cv-pw74-4rxc",
  "modified": "2026-06-18T15:05:14Z",
  "published": "2026-06-18T15:05:14Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/open-telemetry/opentelemetry-collector-contrib/security/advisories/GHSA-w5cv-pw74-4rxc"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/open-telemetry/opentelemetry-collector-contrib"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "opentelemetry-collector-contrib: githubreceiver silently ignores configured required_headers authentication"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

CVE-2026-55701 (GCVE-0-2026-55701)

GHSA-W5CV-PW74-4RXC

githubreceiver Silently Ignores Configured required_headers Authentication

Summary

Details

Amplifying factor

Impact

Suggested Fix

Tags

Sightings

Nomenclature