How severe is CVE-2026-56316?

CVE-2026-56316 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-56316 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-56316?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-56316 have an EU (EUVD) identifier?

Yes. CVE-2026-56316 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38172.

When was CVE-2026-56316 published?

CVE-2026-56316 was published on 2026-06-21 and last updated on 2026-06-24.

CVE-2026-56316

CVE-2026-56316 is a medium-severity vulnerability with a CVSS 3.x base score of 5.3. 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-203.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.9
EPSS exploit prediction: 0% (15th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-38172
Weakness: CWE-203
Published: 2026-06-21
Last modified: 2026-06-24

Description

Cap-go before 12.128.2 contains an information disclosure vulnerability in the OPTIONS /build/upload/:jobId/* endpoint that allows unauthenticated attackers to enumerate valid builder job IDs through observable response discrepancies. Attackers can probe the endpoint without authentication to distinguish valid job IDs from invalid ones and generate sustained unauthenticated traffic for resource consumption.

Frequently asked questions

What is CVE-2026-56316?: Cap-go before 12.128.2 contains an information disclosure vulnerability in the OPTIONS /build/upload/:jobId/* endpoint that allows unauthenticated attackers to enumerate valid builder job IDs through observable response discrepancies. Attackers can probe the endpoint without authentication to distinguish valid job IDs from invalid ones and generate sustained unauthenticated traffic for resource consumption.
How severe is CVE-2026-56316?: CVE-2026-56316 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-56316 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (15th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-56316?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-56316 have an EU (EUVD) identifier?: Yes. CVE-2026-56316 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-38172.
When was CVE-2026-56316 published?: CVE-2026-56316 was published on 2026-06-21 and last updated on 2026-06-24.

References

Other CWE-203 (Observable Discrepancy) vulnerabilities

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