How severe is CVE-2026-5747?

CVE-2026-5747 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over local access with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-5747 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5747?

CVE-2026-5747 primarily affects Amazon Firecracker. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-5747?

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-2026-5747 have an EU (EUVD) identifier?

Yes. CVE-2026-5747 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19996.

When was CVE-2026-5747 published?

CVE-2026-5747 was published on 2026-04-08 and last updated on 2026-06-17.

CVE-2026-5747

CVE-2026-5747 is a high-severity vulnerability in Amazon Firecracker with a CVSS 3.x base score of 7.5. 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-369.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.7
EPSS exploit prediction: 0% (11th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19996
Weakness: CWE-369
Affected product: Amazon Firecracker
Published: 2026-04-08
Last modified: 2026-06-17

Description

An out-of-bounds write issue in the virtio PCI transport in Firecracker 1.13.0 through 1.14.3 and 1.15.0 on x86_64 and aarch64 might allow a local guest user with root privileges to crash the Firecracker VMM process or potentially execute arbitrary code on the host via modification of virtio queue configuration registers after device activation. Achieving code execution on the host requires additional preconditions, such as the use of a custom guest kernel or specific snapshot configurations. To remediate this, users should upgrade to Firecracker 1.14.4 or 1.15.1 and later.

Frequently asked questions

What is CVE-2026-5747?: An out-of-bounds write issue in the virtio PCI transport in Firecracker 1.13.0 through 1.14.3 and 1.15.0 on x86_64 and aarch64 might allow a local guest user with root privileges to crash the Firecracker VMM process or potentially execute arbitrary code on the host via modification of virtio queue configuration registers after device activation. Achieving code execution on the host requires additional preconditions, such as the use of a custom guest kernel or specific snapshot configurations. To remediate this, users should upgrade to Firecracker 1.14.4 or 1.15.1 and later.
How severe is CVE-2026-5747?: CVE-2026-5747 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over local access with high attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-5747 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5747?: CVE-2026-5747 primarily affects Amazon Firecracker. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-5747?: 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-2026-5747 have an EU (EUVD) identifier?: Yes. CVE-2026-5747 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19996.
When was CVE-2026-5747 published?: CVE-2026-5747 was published on 2026-04-08 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:amazon:firecracker:*:*:*:*:*:*:*:*
cpe:2.3:a:amazon:firecracker:1.15.0:-:*:*:*:*:*:*
cpe:2.3:a:amazon:firecracker:1.15.0:dev:*:*:*:*:*:*

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