CVE-2023-0821: Nomad Client Vulnerable to Decompression Bombs in Artifact Block

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-02-16 · updated 2026-06-17
Weakness: CWE-409

Description

HashiCorp Nomad and Nomad Enterprise 1.2.15 up to 1.3.8, and 1.4.3 jobs using a maliciously compressed artifact stanza source can cause excessive disk usage. Fixed in 1.2.16, 1.3.9, and 1.4.4.

Affected products

HashiCorp Nomad Enterprise: before 1.2.15; from 1.3.0 before 1.3.9; from 1.4.0 before 1.4.4 — fixed in 1.2.15, 1.3.9, 1.4.4

How to fix

Upgrade to a fixed version: HashiCorp Nomad Enterprise 1.2.15, 1.3.9, 1.4.4. Check the vendor advisory for mitigations.

References

https://discuss.hashicorp.com/t/hcsec-2023-05-nomad-client-vulnerable-to-decompression-bombs-in-artifact-block/50292
https://discuss.hashicorp.com/t/hcsec-2023-05-nomad-client-vulnerable-to-decompression-bombs-in-artifact-block/50292

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