How severe is CVE-2018-9862?

CVE-2018-9862 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-9862 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-9862?

CVE-2018-9862 affects Hyper Runv. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-9862?

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-2018-9862 published?

CVE-2018-9862 was published on 2018-04-09 and last updated on 2026-06-17.

CVE-2018-9862

CVE-2018-9862 is a high-severity vulnerability in Hyper Runv with a CVSS 3.x base score of 7.8. 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-838.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 7.2
EPSS exploit prediction: 0% (36th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-838
Affected product: Hyper Runv
Published: 2018-04-09
Last modified: 2026-06-17

Description

util.c in runV 1.0.0 for Docker mishandles a numeric username, which allows attackers to obtain root access by leveraging the presence of an initial numeric value on an /etc/passwd line, and then issuing a "docker exec" command with that value in the -u argument, a similar issue to CVE-2016-3697.

Frequently asked questions

What is CVE-2018-9862?: util.c in runV 1.0.0 for Docker mishandles a numeric username, which allows attackers to obtain root access by leveraging the presence of an initial numeric value on an /etc/passwd line, and then issuing a "docker exec" command with that value in the -u argument, a similar issue to CVE-2016-3697.
How severe is CVE-2018-9862?: CVE-2018-9862 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-9862 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (36th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-9862?: CVE-2018-9862 affects Hyper Runv. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-9862?: 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-2018-9862 published?: CVE-2018-9862 was published on 2018-04-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hyper:runv:1.0.0:*:*:*:*:docker:*:*

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