Improper Validation of Unsafe Equivalence in Input Affecting go-fdo-server-debugsource package, versions <0:1.0.1-2.el10_2.3


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.66% (48th percentile)

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  • Snyk IDSNYK-RHEL10-GOFDOSERVERDEBUGSOURCE-18320600
  • published27 Jul 2026
  • disclosed22 May 2026

Introduced: 22 May 2026

CVE-2026-39821  (opens in a new tab)
CWE-1289  (opens in a new tab)

How to fix?

Upgrade RHEL:10 go-fdo-server-debugsource to version 0:1.0.1-2.el10_2.3 or higher.
This issue was patched in RHSA-2026:46395.

NVD Description

Note: Versions mentioned in the description apply only to the upstream go-fdo-server-debugsource package and not the go-fdo-server-debugsource package as distributed by RHEL. See How to fix? for RHEL:10 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