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Fencer Vulns
medium 6.9

CVE-2026-55701 json

OpenTelemetry githubreceiver silently ignores configured required_headers authentication

published 2026-06-18 4 mo ago modified 2026-09-30 39 d ago also EUVD-2026-78778 , GHSA-w5cv-pw74-4rxc , GO-2026-5690

cvss
6.9
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits
0
none known

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.

Patch / fix

  • go github.com/open-telemetry/opentelemetry-collector-contrib/receiver/githubreceiver 0.151.0
  • opentelemetry opentelemetry_collector_contrib 0.151.0
  • opentelemetry-collector-contrib hummingbird 1 0.160.0-0.1.hum1

red hat advisories RHSA-2026:63152

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-55701 updated cvss 5.3

github.com/open-telemetry/opentelemetry-collector-contrib/receiver/githubreceiver: OpenTelemetry Collector Contrib githubreceiver: Unauthorized data injection via authentication bypass

  • Red Hat Hardened Images opentelemetry-collector-contrib 0.160.0-0.1.hum1
    fixed: vendor fix RHSA-2026:63152

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
52 d ago

Exploit prediction

0.70% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 6.9 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
CNA 4.0 6.9 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

Affected packages

ecosystem package affected fixed in
go github.com/open-telemetry/opentelemetry-collector-contrib/receiver/githubreceiver
<0.151.0
0.151.0

Affected products

  • open-telemetry opentelemetry-collector-contrib
  • open-telemetry github.com/open-telemetry/opentelemetry-collector-contrib/receiver/githubreceiver

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.