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

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.

Published: 2023-02-16 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-0821 is rated Moderate Risk (44.3/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.80%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-0821

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.54% 0.80% +0.25%
2 2026-02-18 0.25% 0.54% +0.29%
3 2025-12-13 — 0.25% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-0821

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]

Weakness enumeration for CVE-2023-0821

GitHub Security Advisory for CVE-2023-0821

GHSA-w479-w22g-cffh · Severity: medium · Ecosystem: go — Uncontrolled Resource Consumption in Hashicorp Nomad

OS Trackers for CVE-2023-0821

vendor priority summary link
alpine medium CVE-2023-0821: 1 source package rows (nomad); 10 state rows across 1 repos (edge-community); fixed 0, open 10. https://security.alpinelinux.org/vuln/CVE-2023-0821
redhat medium — https://access.redhat.com/security/cve/CVE-2023-0821
ubuntu medium CVE-2023-0821 medium priority: Ubuntu including 1 source packages (nomad), 7 status rows across 7 suites (bionic, focal, jammy, kinetic, trusty, upstream, xenial): needs-triage 3, DNE 2, ignored 2. https://ubuntu.com/security/CVE-2023-0821

Affected software / configurations for CVE-2023-0821

Vendor Product Version Raw CPE
hashicorp nomad < 1.2.15 cpe:2.3:a:hashicorp:nomad:*:*:*:*:-:*:*:*
hashicorp nomad < 1.2.15 cpe:2.3:a:hashicorp:nomad:*:*:*:*:enterprise:*:*:*
hashicorp nomad >= 1.3.0, < 1.3.9 cpe:2.3:a:hashicorp:nomad:*:*:*:*:-:*:*:*
hashicorp nomad >= 1.3.0, < 1.3.9 cpe:2.3:a:hashicorp:nomad:*:*:*:*:enterprise:*:*:*
hashicorp nomad >= 1.4.0, < 1.4.4 cpe:2.3:a:hashicorp:nomad:*:*:*:*:-:*:*:*
hashicorp nomad >= 1.4.0, < 1.4.4 cpe:2.3:a:hashicorp:nomad:*:*:*:*:enterprise:*:*:*

References for CVE-2023-0821

cvelogic Threat Intelligence