Vulnerability in Amazon Firecracker Jailer (CVE-2026-1386)
Summary
Vulnerability in Amazon Firecracker Jailer (CVE-2026-1386). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
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.
Source: AWS Security Bulletins NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-1386 has been found in Amazon Firecracker Jailer.
Risk of unauthorized operations or information disclosure.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Amazon Firecracker Jailer CVE-2026-1386" on the vendor's site.
CVE-2026-1386 (Amazon Firecracker Jailer)
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (unclassified) exists in Amazon Firecracker Jailer.
Check the vendor advisory for the affected versions of Amazon Firecracker Jailer.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Amazon Firecracker Jailer を使っているサービスとバージョンを洗い出す。
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2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- advisory aws.amazon.com
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- AWS aws.amazon.com
- patch github.com
- patch github.com