Amazon AWS Firecracker up to 1.13.1/1.14.0 on Linux Jailer symlink

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.00

Summaryinfo

A vulnerability labeled as critical has been found in Amazon AWS Firecracker up to 1.13.1/1.14.0 on Linux. Affected by this vulnerability is an unknown functionality of the component Jailer. Such manipulation leads to symlink. This vulnerability is documented as CVE-2026-1386. The attack needs to be performed locally. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Amazon AWS Firecracker up to 1.13.1/1.14.0 on Linux and classified as critical. Affected by this issue is an unknown part of the component Jailer. The manipulation with an unknown input leads to a symlink vulnerability. Using CWE to declare the problem leads to CWE-61. The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at aws.amazon.com. This vulnerability is handled as CVE-2026-1386 since 01/23/2026. The exploitation is known to be easy. The attack needs to be approached locally. The exploitation needs additional levels of successful authentication. There are neither technical details nor an exploit publicly available.

Upgrading to version 1.13.2 or 1.14.1 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.0
CNA Vector (AMZN): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Symlink
CWE: CWE-61 / CWE-59
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: AWS Firecracker 1.13.2/1.14.1

Timelineinfo

01/23/2026 CVE reserved
01/23/2026 +0 days VulDB entry created
01/24/2026 +0 days Advisory disclosed
01/24/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: GHSA-36j2-f825-qvgc
Status: Confirmed

CVE: CVE-2026-1386 (🔒)
GCVE (CVE): GCVE-0-2026-1386
GCVE (VulDB): GCVE-100-342716

Entryinfo

Created: 01/24/2026 00:47
Changes: 01/24/2026 00:47 (79)
Complete: 🔍
Cache ID: 216::103

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