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CVE-2026-103503— Hex trusts its bundled CA certificates when cacerts_path is set

Quick assessment

Affected
hexpm hex
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

以下是对该漏洞描述信息的中文翻译： 不恰当的证书验证漏洞 在 hexpm hex 中存在一个不恰当的证书验证漏洞。攻击者若能拦截 HTTPS 连接，并持有由 Hex 内置 CA 证书颁发机构（CA）签发的 Hex 主机证书，则可能向将 配置为不包含该 CA 的 CA 证书库的用户冒充该主机。 （环境变量 ）文档中定义为 CA 证书存储库的路径，用于替代 Hex 随附的 CA 证书 bundle。虽然 会将配置的路径作为 选项传递，但它无论是否设置了 ，都会从内置的 CA 证书 bundle 中构建 （部分链）回调函

CVSS 5.9 · Medium EPSS 0.19% · P8

Affected Version Matrix 2

VendorProduct Version RangeStatus
hexpm hex 0.20.2< 2.5.2 affected
c9b26a46928bfcd546773571e09c1d05f4cd9fb7< * affected
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I. Basic Information for CVE-2026-103503

Vulnerability Information
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Vulnerability Title
Hex trusts its bundled CA certificates when cacerts_path is set
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
hexpm hex 0.20.2 ~ 2.5.2 cpe:2.3:a:hexpm:hex:*:*:*:*:*:*:*:*
hexpm hex c9b26a46928bfcd546773571e09c1d05f4cd9fb7 ~ * cpe:2.3:a:hexpm:hex:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-103503

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III. Intelligence Information for CVE-2026-103503

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Patches & Fixes for CVE-2026-103503 (3)

Vendor Advisories for CVE-2026-103503 (3)

Same Patch Batch · hexpm · 2026-10-12 · 7 CVEs total

CVE-2026-96612 7.5 HIGH Path traversal in Hex via unvalidated dependency app names
CVE-2026-105668 7.1 HIGH Hex release-age cooldown is lifted package-wide when the locked release is retired
CVE-2026-105280 6.9 MEDIUM Hex writes unverified package tarballs to standard output in mix hex.package fetch
CVE-2026-103502 5.9 MEDIUM hex_core's default HTTP adapter doesn't verify TLS certificates on OTP 24 and 25
CVE-2026-81856 2.3 LOW Terminal escape sequence injection in Hex via unneutralized server-supplied output
CVE-2026-96618 2.1 LOW Hex exhausts memory and disk on oversized or compressed responses from an untrusted mirror

IV. Related Vulnerabilities

Same product: hex
Same vendor: hexpm
Same weakness: CWE-295

V. Comments for CVE-2026-103503

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