Trivy: Helm chart tar bomb causes OOM via unbounded io.ReadAll in parser

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

Trivy is a security scanner. Prior to 0.71.0, when Trivy scans a Helm chart archive (.tgz), its custom tar unpacker reads each entry with io.ReadAll(tr) and no size limit. An attacker who can place a malicious .tgz file in the scanned path can craft a small compressed archive that decompresses to gigabytes, causing the Trivy process to be killed by the OS OOM killer. This vulnerability is fixed in 0.71.0.

Source published

25 Jun 2026 16:27:33 UTC

Source modified

25 Jun 2026 18:55:50 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

CVE Program Terms of Use

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CVSS 4.0 · 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Trivy is a security scanner. Prior to 0.71.0, when Trivy scans a Helm chart archive (.tgz), its custom tar unpacker reads each entry with io.ReadAll(tr) and no size limit. An attacker who can place a malicious .tgz file in the scanned path can craft a small compressed archive that decompresses to gigabytes, causing the Trivy process to be killed by the OS OOM killer. This vulnerability is fixed in 0.71.0.

Source published

Jun 25, 2026, 4:27:33 PM (timezone not stated)

Source modified

Jun 25, 2026, 6:55:50 PM (timezone not stated)

Observed here

7 Nov 2026 12:29:51 UTC

Source terms

ENISA EUVD · source terms and attribution apply

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 4.0 · 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Trivy is a security scanner. Prior to 0.71.0, when Trivy scans a Helm chart archive (.tgz), its custom tar unpacker reads each entry with io.ReadAll(tr) and no size limit. An attacker who can place a malicious .tgz file in the scanned path can craft a small compressed archive that decompresses to gigabytes, causing the Trivy process to be killed by the OS OOM killer. This vulnerability is fixed in 0.71.0.

Source published

25 Jun 2026 17:16:41 UTC

Source modified

25 Oct 2026 22:10:00 UTC

Observed here

27 Oct 2026 14:13:32 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · [email protected] · Secondary · 6.9 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS 3.1 · [email protected] · Primary · 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

## Summary When Trivy scans a Helm chart archive (`.tgz`), its custom tar unpacker reads each entry with `io.ReadAll(tr)` and no size limit. An attacker who can place a malicious `.tgz` file in the scanned path can craft a small compressed archive that decompresses to gigabytes, causing the Trivy process to be killed by the OS OOM killer. ## Affected configurations Exploitation requires the attacker to place a crafted `.tgz` file in a location that Trivy will scan as a Helm chart. This applies to the following scan targets: | Command | Condition | | --- | --- | | `trivy config <dir>` | Directory contains a crafted `.tgz` Helm chart (misconfiguration scanning is always enabled) | | `trivy filesystem --scanners misconf <dir>` | Directory contains a crafted `.tgz` Helm chart **and** `--scanners misconf` is explicitly enabled | | `trivy image --scanners misconf <image>` | Image contains a crafted `.tgz` Helm chart **and** `--scanners misconf` is explicitly enabled | Realistic scenarios include: - A CI pipeline that runs `trivy config .` on a repository where a contributor can submit a pull request containing a crafted chart archive. - A pipeline that scans a container image with `--scanners misconf`, whose build context includes untrusted `.tgz` files. ## Impact An attacker who satisfies the conditions above can exhaust all available memory on the host running Trivy. The OS OOM killer will terminate the Trivy process and may affect other processes sharing the same host or CI runner. The practical impact in CI environments is denial of service: the scan fails, the pipeline is blocked, and repeated submissions re-trigger the same condition. Cloud CI runners may also incur additional costs for consumed resources. There is no impact on confidentiality or integrity of the scanned system. ## Patches Fixed in Trivy `v0.71.0` (#10718). The custom tar unpacker was replaced with `archive.LoadArchiveFiles` from the official `helm.sh/helm/v4` SDK, which enforces per-entry and total size limits and validates archive structure. Users should upgrade to `v0.71.0` or later. ## Workarounds If upgrading is not immediately possible: - Set a memory limit (cgroup/container) on the Trivy process to bound the blast radius. - Use `--skip-dirs` to exclude directories containing untrusted Helm chart archives from the scan. - Avoid scanning repositories or images with untrusted `.tgz` files. ## Credits Reported by @jamesgol.

Source published

14 Jul 2026 19:52:14 UTC

Source modified

10 Sep 2026 03:50:52 UTC

Observed here

24 Oct 2026 13:19:41 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Publisher rating · HIGH

Trivy: Helm chart tar bomb causes OOM via unbounded io.ReadAll in parser in github.com/aquasecurity/trivy

Source published

27 Jul 2026 15:30:50 UTC

Source modified

28 Jul 2026 15:15:01 UTC

Observed here

24 Oct 2026 13:19:41 UTC

Source terms

OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.