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VulnerabilityCVE-2026-2031Published 2026-05-15

CVE-2026-2031 — Google Cloud Internal Integration Platform APIs

critical (derived)

As of 2026-05-15, CVE-2026-2031 is a Critical-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in Google Cloud Internal Integration Platform APIs, CVSS v4.0 10, EPSS 0.5% (39.6th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-2031, most recently “CVE-2026-2031 "StubZero": Remote Code Execution in Google Cloud Application Integration via Exposed Proto Descriptors, GenericStubbyTypedTaskV2 and ACL Bypass”.

CVSS v4.0
10/10Critical (derived)
EPSS
0.5%Higher than 39.6% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
1Campaigns referencing it
Priority
6.6/10Threadlinqs triage score
Published
CVSS v4.0 10 (Critical, derived from score) · EPSS 0.5% (higher than 39.6% of all scored CVEs) · Priority 6.6/10 · Published 2026-05-15

Last updated:

What is CVE-2026-2031?

An Improper Access Control vulnerability in several internal API endpoints for Google Cloud Application Integration prior to 2026-01-23 allows a remote, unauthenticated attacker to disclose sensitive internal information and execute arbitrary code using specially crafted HTTP requests to inadvertently exposed internal API endpoints.

The record classifies CVE-2026-2031 under weakness class CWE-862. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 143 days ago.

Severity and exploitation probability

CVSS v4.0 base score
10 — Critical (derived from score)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/U:Clear
EPSS (FIRST)
0.5% probability of exploitation in the next 30 days, higher than 39.6% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
6.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-05-15

Is CVE-2026-2031 being exploited?

No public exploitation evidence for CVE-2026-2031 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-05-15. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

Affected products and versions

  • Google Cloud: Internal Integration Platform APIs

How to fix CVE-2026-2031

No vendor patch reference has been recorded for CVE-2026-2031 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-2031

1 tracked threat in the Threadlinqs corpus references CVE-2026-2031, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Other references