How severe is CVE-2018-19786?

CVE-2018-19786 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-19786 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-19786?

CVE-2018-19786 affects Hashicorp Vault. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-19786?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-19786 published?

CVE-2018-19786 was published on 2018-12-05 and last updated on 2026-06-17.

CVE-2018-19786

CVE-2018-19786 is a high-severity vulnerability in Hashicorp Vault with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-532.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 4.3
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-532
Affected product: Hashicorp Vault
Published: 2018-12-05
Last modified: 2026-06-17

Description

HashiCorp Vault before 1.0.0 writes the master key to the server log in certain unusual or misconfigured scenarios in which incorrect data comes from the autoseal mechanism without an error being reported.

Frequently asked questions

What is CVE-2018-19786?: HashiCorp Vault before 1.0.0 writes the master key to the server log in certain unusual or misconfigured scenarios in which incorrect data comes from the autoseal mechanism without an error being reported.
How severe is CVE-2018-19786?: CVE-2018-19786 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-19786 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-19786?: CVE-2018-19786 affects Hashicorp Vault. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-19786?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-19786 published?: CVE-2018-19786 was published on 2018-12-05 and last updated on 2026-06-17.

References

https://github.com/hashicorp/vault/blob/master/CHANGELOG.md#100-december-3rd-2018

Affected products (1)

cpe:2.3:a:hashicorp:vault:*:*:*:*:*:*:*:*

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