CVE-2026-103503
- Source
- https://cve.org/CVERecord?id=CVE-2026-103503
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103503.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-103503
- Aliases
-
- EEF-CVE-2026-103503
- GHSA-rw8q-hg7m-cxgr
- Downstream
- Published
- 2026-10-12T15:17:45Z
- Modified
- 2026-10-28T02:30:57Z
- 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
- Summary
- Hex trusts its bundled CA certificates when cacerts_path is set
- 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.
- Database specific
{ "cna_assigner": "EEF", "cwe_ids": [ "CWE-295" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103503.json" }- References
-
- https://cna.erlef.org/cves/CVE-2026-103503.html
- https://github.com
- https://osv.dev/vulnerability/EEF-CVE-2026-103503
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103503.json
- https://github.com/hexpm/hex/security/advisories/GHSA-rw8q-hg7m-cxgr
- https://nvd.nist.gov/vuln/detail/CVE-2026-103503
- https://github.com/hexpm/hex/commit/5f5a2136c7cf5991b6e8a30d645ca9f8e74b0785
- https://github.com/hexpm/hex/commit/6232a6498015e559743bec4f4fbec9138837cec8
- https://github.com/hexpm/hex/commit/c9b26a46928bfcd546773571e09c1d05f4cd9fb7
- https://github.com/hexpm/hex
Affected packages
Git / github.com/hexpm/hex
Affected ranges
- Type
- GIT
- Repo
- https://github.com/hexpm/hex
- Events
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "c9b26a46928bfcd546773571e09c1d05f4cd9fb7" }, { "fixed": "5f5a2136c7cf5991b6e8a30d645ca9f8e74b0785" } ], "source": "AFFECTED_FIELD", "strategy": "ChangesAt" }, { "range": [ { "introduced": "0.20.2" }, { "fixed": "2.5.2" } ], "source": "AFFECTED_FIELD", "strategy": "StandardRange" }, { "range": [ { "fixed": "c9b26a46928bfcd546773571e09c1d05f4cd9fb7" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "5f5a2136c7cf5991b6e8a30d645ca9f8e74b0785" } ], "source": "REFERENCES_COMMIT" }, { "range": [ { "fixed": "6232a6498015e559743bec4f4fbec9138837cec8" } ], "source": "REFERENCES_COMMIT" } ] }