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CVE-2026-39821VulnerabilityPublished Updated

SUSE · Security update for helm

Affects SUSESource GCVE Database

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Authoritative record:CVE-2026-39821· Critical 9.6

Not known to be exploited · CVSS 9.6 Critical · fixed in SUSE package updates : patch SUSE http as a priority.

Data as of 10 Nov 2026, 20:06 UTC

CVSS 3.1 base score
9.6Critical
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 1.27.0-rc.3, 1.26.6, 1.25.13 +1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 22 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

What to do

Upgrade net/http and net/http/internal/http2 to 1.27.0-rc.3, 1.26.6 or 1.25.13; golang.org/x/net/idna to 0.55.0.

Affected software

ProductAffectedFixed in
Go standard librarynet/httpAffected
  • >=1.27.0-0 <1.27.0-rc.3
Fixed in
  • 1.27.0-rc.3
Go standard librarynet/httpAffected
  • >=1.26.0-0 <1.26.6
Fixed in
  • 1.26.6
Go standard librarynet/httpAffected
  • <1.25.13
Fixed in
  • 1.25.13
Go standard librarynet/http/internal/http2Affected
  • >=1.27.0-0 <1.27.0-rc.3
Fixed in
  • 1.27.0-rc.3
Go standard librarynet/http/internal/http2Affected
  • >=1.26.0-0 <1.26.6
Fixed in
  • 1.26.6
Go standard librarynet/http/internal/http2Affected
  • <1.25.13
Fixed in
  • 1.25.13

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

Description

This update for helm fixes the following issue - CVE-2026-39821: golang.org/x/net/idna: failure to reject ASCII-only Punycode-encoded labels allows for validation bypass and privilege escalation (bsc#1266598). Changes for helm: - Update to version 3.21.1: * Fixed nil pointer panic that could happen with helm template in ClientOnly flows. Now correctly returns a template error #31920 * Bumped golang.org/x/net to v0.55.0 to address GO-2026-5026 #32152 * Bumped Go from 1.25 to 1.26 #32168 * Dependency version updates - chore(deps): bump oras.land/oras-go/v2 from 2.6.0 to 2.6.1 - chore(deps): bump golang.org/x/crypto from 0.52.0 to 0.53.0 - chore(deps): bump golang.org/x/term from 0.43.0 to 0.44.0 - chore(deps): bump golang.org/x/text from 0.37.0 to 0.38.0 - chore(deps): bump github.com/lib/pq from 1.11.2 to 1.12.3 - chore(deps): bump github.com/distribution/distribution/v3 - chore(deps): bump github.com/containerd/containerd from 1.7.30 to 1.7.32 - chore(deps): bump github.com/Masterminds/semver/v3 from 3.4.0 to 3.5.0 - chore(deps): bump github.com/mattn/go-shellwords from 1.0.12 to 1.0.13 - chore(deps): bump golang.org/x/crypto from 0.51.0 to 0.52.0 - chore(deps): bump k8s.io/klog/v2 from 2.130.1 to 2.140.0 - chore(deps): bump golang.org/x/text from 0.35.0 to 0.37.0

References

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