CVE-2026-103503

Published: Ott 12, 2026 Last Modified: Ott 12, 2026

ExploitDB:

Other exploit source:

Google Dorks:

MEDIUM 5,9

Source: 6b3ad84c-e1a6-4bf7-a703-f496b71e49db

Attack Vector: network

Attack Complexity: high

Privileges Required: none

User Interaction: active

Confidentiality: N/A

Integrity: N/A

Availability: N/A

Description

AI Translation Available

Improper Certificate Validation vulnerability in hexpm hex allows an attacker who can intercept HTTPS connections, and holds a certificate for a Hex host issued by a CA in Hex's bundled CA store, to impersonate that host to users who set cacerts_path to a CA store that leaves that CA out.

cacerts_path (HEX_CACERTS_PATH) is documented as the path to the CA certificate store, used instead of the CA bundle that ships with Hex. Hex.HTTP.SSL.ssl_opts/1 passes the configured store as the cacerts option, but builds the partial_chain callback from the bundled store whether cacerts_path is set or not. Hex.HTTP.SSL.partial_chain/2 accepts a server chain when any certificate in it has the same public key as a bundled CA certificate, so a chain that leads to a bundled CA passes verification although the configured store doesn't contain that CA. Hostname verification still applies.

This issue affects hex: from 0.20.2 before 2.5.2.