NIST deprecates RSA-2048 from 2030. Find every one of them before attackers do.
🐹
🐹 Go
Not in CISA KEV
MEDIUM severity

CVE-2023-0821 — nomad

MEDIUM

CVE-2023-0821 is a medium-severity (CVSS 6.5) CWE-409 vulnerability in github.com/hashicorp/nomad. A fix is available for github.com/hashicorp/nomad — see the affected versions and patch details below.

Nomad Client Vulnerable to Decompression Bombs in Artifact Block

Also known asGHSA-w479-w22g-cffhGO-2023-1581
Published
Updated
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Nov 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2023-0821.

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs57th percentile — riskier than 57% of all scored CVEsHighest risk
0.00%0.43%0.86%1.29%0.5%0.8%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

3 pkgs affected
🐹github.com/hashicorp/nomad🐹github.com/hashicorp/nomad🐹github.com/hashicorp/nomad

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

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 Packages

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/hashicorp/nomad≥ 1.2.15&&< 1.2.161.2.16go get github.com/hashicorp/nomad@v1.2.16
🐹Gogithub.com/hashicorp/nomad≥ 1.3.0&&< 1.3.91.3.9go get github.com/hashicorp/nomad@v1.3.9
🐹Gogithub.com/hashicorp/nomad≥ 1.4.0&&< 1.4.41.4.4go get github.com/hashicorp/nomad@v1.4.4

Affected Products

1 product · 6 configurations
Application
nomadhashicorp
≥ 1.4.0 && < 1.4.4
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/hashicorp/nomad, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/hashicorp/nomad to 1.2.16 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-0821 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

Is CVE-2023-0821 in your dependencies?

Find it across Go, including transitive dependencies.

Scan my dependencies How O3 SCA works
CVE-2023-0821: nomad — Fixed in 1.2.16