How severe is CVE-2026-1386?

CVE-2026-1386 has a CVSS 3.x base score of 6.0, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2026-1386 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-1386?

CVE-2026-1386 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-2026-1386?

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

Does CVE-2026-1386 have an EU (EUVD) identifier?

Yes. CVE-2026-1386 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4536.

When was CVE-2026-1386 published?

CVE-2026-1386 was published on 2026-01-23 and last updated on 2026-06-17.

CVE-2026-1386

CVE-2026-1386 is a medium-severity vulnerability in Amazon Firecracker with a CVSS 3.x base score of 6.0. 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-61.

Key facts

Severity: Medium (CVSS 3.x base score 6.0)
CVSS v4: 6.0
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-4536
Weakness: CWE-61
Affected product: Amazon Firecracker
Published: 2026-01-23
Last modified: 2026-06-17

Description

A UNIX symbolic link following issue in the jailer component in Firecracker version v1.13.1 and earlier and 1.14.0 on Linux may allow a local host user with write access to the pre-created jailer directories to overwrite arbitrary host files via a symlink attack during the initialization copy at jailer startup, if the jailer is executed with root privileges. To mitigate this issue, users should upgrade to version v1.13.2 or 1.14.1 or above.

Frequently asked questions

What is CVE-2026-1386?: A UNIX symbolic link following issue in the jailer component in Firecracker version v1.13.1 and earlier and 1.14.0 on Linux may allow a local host user with write access to the pre-created jailer directories to overwrite arbitrary host files via a symlink attack during the initialization copy at jailer startup, if the jailer is executed with root privileges. To mitigate this issue, users should upgrade to version v1.13.2 or 1.14.1 or above.
How severe is CVE-2026-1386?: CVE-2026-1386 has a CVSS 3.x base score of 6.0, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2026-1386 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-1386?: CVE-2026-1386 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-2026-1386?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-1386 have an EU (EUVD) identifier?: Yes. CVE-2026-1386 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4536.
When was CVE-2026-1386 published?: CVE-2026-1386 was published on 2026-01-23 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:amazon:firecracker:*:*:*:*:*:*:*:*
cpe:2.3:a:amazon:firecracker:1.14.0:-:*:*:*:*:*:*
cpe:2.3:a:amazon:firecracker:1.14.0:dev:*:*:*:*:*:*

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