How severe is CVE-2026-27140?

CVE-2026-27140 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-27140 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27140?

CVE-2026-27140 affects Golang Go. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27140?

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.

Does CVE-2026-27140 have an EU (EUVD) identifier?

Yes. CVE-2026-27140 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20002.

When was CVE-2026-27140 published?

CVE-2026-27140 was published on 2026-04-08 and last updated on 2026-06-30.

CVE-2026-27140

CVE-2026-27140 is a high-severity vulnerability in Golang Go with a CVSS 3.x base score of 8.8. 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-863.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-20002
Weakness: CWE-863
Affected product: Golang Go
Published: 2026-04-08
Last modified: 2026-06-30

Description

SWIG file names containing 'cgo' and well-crafted payloads could lead to code smuggling and arbitrary code execution at build time due to trust layer bypass.

Frequently asked questions

What is CVE-2026-27140?: SWIG file names containing 'cgo' and well-crafted payloads could lead to code smuggling and arbitrary code execution at build time due to trust layer bypass.
How severe is CVE-2026-27140?: CVE-2026-27140 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-27140 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27140?: CVE-2026-27140 affects Golang Go. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27140?: 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.
Does CVE-2026-27140 have an EU (EUVD) identifier?: Yes. CVE-2026-27140 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-20002.
When was CVE-2026-27140 published?: CVE-2026-27140 was published on 2026-04-08 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*

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