Detections
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Amazon Linux 2 : runfinch-finch, --advisory ALAS2DOCKER-2026-137 (ALASDOCKER-2026-137)

high Nessus Plugin ID 332018

Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of runfinch-finch installed on the remote host is prior to 1.17.2-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2DOCKER-2026-137 advisory.

 On Unix systems, opening a file in an os.Root improperly follows symlinks to locations outside of the Root when the final path component of the a path is a symbolic link and the path ends in /. For example, 'root.Open(symlink/)' will open symlink even when symlink is a symbolic link pointing outside of the root. (CVE-2026-39822)

 Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello. (CVE-2026-42505)

 A flaw was found in Rekor. The `Package.Unmarshal()` function, which processes Alpine Package Keep (APK) files, decompresses gzip streams without limiting the total decompressed size. A remote attacker can exploit this by crafting a malicious APK file with a high compression ratio, causing the server to consume excessive memory. This leads to a Denial of Service (DoS) through an out-of-memory (OOM) error, and can be triggered via unauthenticated API endpoints. (CVE-2026-48702)

 A flaw was found in Fulcio's OpenID Connect (OIDC) Discovery client. This vulnerability allows a remote attacker to perform Server-Side Request Forgery (SSRF) by redirecting discovery requests to internal systems. Additionally, an attacker can manipulate the JSON Web Key Set (JWKS) Uniform Resource Identifier (URI) to poison the verifier cache with malicious keys, enabling the validation of attacker-controlled signatures. Furthermore, the flaw can lead to the leakage of Kubernetes ServiceAccount tokens to third- party hosts through cross-host redirects or misconfigured MetaIssuers, potentially exposing sensitive cluster credentials. (CVE-2026-49478)

 A flaw was found in Sigstore Timestamp Authority. An unauthenticated remote attacker can exploit this vulnerability by sending requests with arbitrary HTTP paths and methods. This leads to the creation of an excessive number of unique metric labels, causing unbounded memory growth and a denial of service (DoS) condition on the server. This issue is a type of Improper Restriction of Resource Consumption (CWE-770).
 (CVE-2026-49835)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Run 'yum update runfinch-finch' or or 'yum update --advisory ALAS2DOCKER-2026-137' to update your system.

See Also

https://alas.aws.amazon.com//AL2/ALAS2DOCKER-2026-137.html

https://alas.aws.amazon.com/faqs.html

https://explore.alas.aws.amazon.com/CVE-2026-39822.html

https://explore.alas.aws.amazon.com/CVE-2026-42505.html

https://explore.alas.aws.amazon.com/CVE-2026-48702.html

https://explore.alas.aws.amazon.com/CVE-2026-49478.html

https://explore.alas.aws.amazon.com/CVE-2026-49835.html

Plugin Details

Severity: High

ID: 332018

File Name: al2_ALASDOCKER-2026-137.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 8/4/2026

Updated: 8/4/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.7

Percentile: 99.03

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-49835

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:runfinch-finch

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 8/4/2026

Vulnerability Publication Date: 6/25/2026

Reference Information

CVE: CVE-2026-39822, CVE-2026-42505, CVE-2026-48702, CVE-2026-49478, CVE-2026-49835

IAVB: 2026-B-0193