CVE-2026-39821 Affecting opentelemetry-collector package, versions <0:0.152.1-1.el9_8


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.69% (51st percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-ALMALINUX9-OPENTELEMETRYCOLLECTOR-17890470
  • published8 Jul 2026
  • disclosed9 Jul 2026

Introduced: 8 Jul 2026

CVE-2026-39821  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:9 opentelemetry-collector to version 0:0.152.1-1.el9_8 or higher.
This issue was patched in ALSA-2026:34359.

NVD Description

Note: Versions mentioned in the description apply only to the upstream opentelemetry-collector package and not the opentelemetry-collector package as distributed by AlmaLinux. See How to fix? for AlmaLinux:9 relevant fixed versions and status.

The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode("xn--example-.com") incorrectly returns the name "example.com" rather than an error. This behavior can lead to privilege escalation in programs using the idna package. For example, a program which performs privilege checks on the ASCII hostname may reject "example.com" but permit "xn--example-.com". If that program subsequently converts the ASCII hostname to Unicode, it will inadvertently permits access to the Unicode name "example.com".

References

CVSS Base Scores

version 3.1