Description
Helm through 4.2.3, fixed in commit ba6c9a2, contains a denial of service vulnerability in the Files.Lines template helper in pkg/engine/files.go that allows attackers to trigger an index out of range panic by including zero-length byte slices in chart files. Attackers can include empty files in Helm charts to cause deterministic render failures across template, install, upgrade, lint, and SDK Engine.Render operations.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| helm | helm | ≤ 4.2.3 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | helm3 | 3.21.3-0.1.2.hum1 | RHSA-2026:55180, RHSA-2026:42241 |
| Red Hat Hardened Images 1 | helm4 | 4.2.3-0.1.2.hum1 | RHSA-2026:42230 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | helm | 3.21.3-150000.1.93.1 | SUSE-SU-2026:3882-1 |
| SLES 15 SP6 | helm | 3.21.3-150000.1.93.1 | SUSE-SU-2026:3882-1 |
| SLES 15 SP5 | helm | 3.21.3-150000.1.93.1 | SUSE-SU-2026:3882-1 |
| SLES 15 SP4 | helm | 3.21.3-150000.1.93.1 | SUSE-SU-2026:3882-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | helm | 3.21.3-160000.2.1 | SUSE-SU-2026:23688-1 |
| SLES for SAP 15 SP6 | helm | 3.21.3-150000.1.93.1 | SUSE-SU-2026:3882-1 |
| SLES for SAP 15 SP5 | helm | 3.21.3-150000.1.93.1 | SUSE-SU-2026:3882-1 |
| SLES for SAP 15 SP4 | helm | 3.21.3-150000.1.93.1 | SUSE-SU-2026:3882-1 |
| SLES 16.0 | helm | 3.21.3-160000.2.1 | SUSE-SU-2026:23688-1 |
| SLE Micro 6.2 | c-ares | 1.34.8-160000.1.1 | SUSE-SU-2026:23456-1 |
| SLE Micro 6.2 | helm | 3.21.3-160000.2.1 | SUSE-SU-2026:23506-1 |
| SLE Micro 6.1 | helm | 3.21.3-slfo.1.1_2.1 | SUSE-SU-2026:23522-1 |
| SLE Micro 6.0 | helm | 3.21.3-2.1 | SUSE-SU-2026:23456-1 |
| SLE Micro 5.5 | helm | 3.21.3-150000.1.93.1 | SUSE-SU-2026:3882-1 |
| SLE HPC 15 SP5 | helm | 3.21.3-150000.1.93.1 | SUSE-SU-2026:3882-1 |
| SLE HPC 15 SP4 | helm | 3.21.3-150000.1.93.1 | SUSE-SU-2026:3882-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | helm | 4.2.3-4.1 | openSUSE-SU-2026:11386-1 |
| openSUSE Tumbleweed | helm3 | 3.21.3-4.1 | openSUSE-SU-2026:11387-1 |
| openSUSE Leap 16.0 | helm | 3.21.3-160000.2.1 | openSUSE-SU-2026:21809-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | cert-manager | 1.12.15-11 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | helm-3 | No fix yet | — |
| Wolfi rolling | helm-4 | 4.2.4-r0 | — |
Advisories 14
- RHSA-2026:42241 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:42230 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- SUSE-SU-2026:23688-1 Security update for helm SUSE / openSUSE Security Updates · Sep 29, 2026
- WID-SEC-2026-3403 Oracle Communications: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 24, 2026
- WID-SEC-2026-2412 helm: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Sep 16, 2026
- NCSC-2026-0375 Kwetsbaarheden verholpen in Oracle Communications NCSC-NL (Netherlands) · Sep 16, 2026
- SUSE-SU-2026:23522-1 Security update for helm SUSE / openSUSE Security Updates · Sep 15, 2026
- SUSE-SU-2026:23506-1 Security update for helm SUSE / openSUSE Security Updates · Sep 14, 2026
- SUSE-SU-2026:23456-1 Security update for helm SUSE / openSUSE Security Updates · Sep 14, 2026
- openSUSE-SU-2026:21809-1 Security update for helm SUSE / openSUSE Security Updates · Sep 10, 2026
- SUSE-SU-2026:3882-1 Security update for helm SUSE / openSUSE Security Updates · Sep 10, 2026
- RHSA-2026:55180 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Sep 8, 2026
- openSUSE-SU-2026:11387-1 helm3-3.21.3-4.1 on GA media SUSE / openSUSE Security Updates · Jul 29, 2026
- openSUSE-SU-2026:11386-1 helm-4.2.3-4.1 on GA media SUSE / openSUSE Security Updates · Jul 29, 2026
References
- Researcher Disclosure technical-description exploit issue-tracking
- Pull Request issue-tracking patch
- Patch Commit patch
- VulnCheck Advisory: Helm Files.Lines Denial of Service via Empty Chart Files third-party-advisory