UBUNTU-CVE-2026-103503

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Source

https://ubuntu.com/security/CVE-2026-103503

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103503.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-103503

Upstream

CVE-2026-103503

Published

2026-10-15T00:00:00Z

Modified

2026-10-17T12:57:58Z

Severity

5.9 (Medium) CVSS_V4 - 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 CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

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.

References

Affected packages

Ubuntu:24.04:LTS / erlang-hex

Package

Name: erlang-hex
Purl: pkg:deb/ubuntu/erlang-hex?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.0.5-1

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "erlang-hex",
            "binary_version":  "2.0.5-1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103503.json"

Ubuntu:26.10 / erlang-hex

Package

Name: erlang-hex
Purl: pkg:deb/ubuntu/erlang-hex?arch=source&distro=stonking

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.0.6-2build1

2.5.1-2

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "erlang-hex",
            "binary_version":  "2.5.1-2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103503.json"

Ubuntu:26.04:LTS / erlang-hex

Package

Name: erlang-hex
Purl: pkg:deb/ubuntu/erlang-hex?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.0.6-2

2.0.6-2build1

Ecosystem specific

{
    "binaries":  [
        {
            "binary_name":  "erlang-hex",
            "binary_version":  "2.0.6-2build1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-103503.json"