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GO-2025-3373 BIT-golang-2024-45341 CVE-2024-45341

Usage of IPv6 zone IDs can bypass URI name constraints in crypto/x509

Medium Go
Severity
6.1 / 10
Medium · CVSS 3.1
Exploit chance (EPSS)
0.57%
Chance of exploitation in the next 30 days. Higher than 47.07% of scored vulnerabilities.
Known exploited
No
Not in CISA's catalog
Weakness
—
Not classified
Fix
1.24.0-rc.2
Upgrade stdlib to this version or later

Description

A certificate with a URI which has a IPv6 address with a zone ID may incorrectly satisfy a URI name constraint that applies to the certificate chain.

Certificates containing URIs are not permitted in the web PKI, so this only affects users of private PKIs which make use of URIs.

Affected versions

Go

PackageVulnerableFixed in
stdlib
< 1.22.11
>= 1.23.0-0, < 1.23.5
>= 1.24.0-0, < 1.24.0-rc.2
1.22.11
1.23.5
1.24.0-rc.2

How to fix

Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.

stdlib Go → 1.24.0-rc.2

go
go get stdlib@v1.24.0-rc.2 && go mod tidy

Severity breakdown

CVSS 3.1 6.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

References

Fixes and patches

Issue reports

Other links

Timeline

  1. Published
  2. Last updated by the source
  3. Latest EPSS score
AdvisorySeverityWhy it's related
GHSA-4374-p667-p6c8
HTTP/2 rapid reset can cause excessive work in net/http
High Known exploited Also affects stdlib
CVE-2020-0601
Certificate validation bypass on Windows in crypto/x509
High Known exploited Also affects stdlib
RUSTSEC-2026-0382
Distrust compromised intermediate certificates in crypto/x509
Medium Also affects stdlib
GO-2026-6613
HTTP/1 server connection desynchronization after 2xx CONNECT response in net/http
High Also affects stdlib
GO-2026-6609
Lack of limit on size of parsed Range headers in net/http
High Also affects stdlib
GO-2026-6608
Memory limit bypass when parsing MIME headers in net/textproto, mime/multipart
High Also affects stdlib
GO-2026-6607
Reject malformed ECH outer extension references in crypto/tls
High Also affects stdlib
GO-2026-6604
Root.Mkdir(All) can follow junctions out of the root on Windows in os
Critical Also affects stdlib

Credits: Juho Forsén of Mattermost

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