CVE-2026-39821(golang / net)

LOWCVSS 9.6 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

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".

0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-1289

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • net

Threat summary

  • 1 mentions across 1 observed day

What's happening

  • 1 total mentions across 1 day

Affected systems

Vendors
Products
net

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-10-15: 110-15
Full discourse1 post
  • GCP Weekly@gcpweekly

    CVE-2026-75804 CVE-2026-75805 CVE-2026-75806 CVE-2026-77696 CVE-2026-84782 CVE-2026-84784 N/A Security fixes for apigee-hybrid-cassandra-client. This addresses the following vulnerabilities: CVE-2026-33818 CVE-2026-39821 CVE-2026-46600 CVE-2026-56853 CVE-2026-56858 6/16

    1000018
    1.8K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appgolangnet-go-

Explore more