{"id":"CVE-2026-103503","revision":null,"records":[{"revision":"02499f86593943c3bbbdbccf6ec72e0b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-103503","aliases":[],"title":"Hex trusts its bundled CA certificates when cacerts_path is set","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.\n\ncacerts_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.\n\nThis issue affects hex: from 0.20.2 before 2.5.2.","state":0,"publishedAt":"2026-10-12T15:17:45.545+00:00","modifiedAt":"2026-10-16T17:32:45.735+00:00","affected":[{"ecosystem":"Vendor product","name":"hex","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"cpes\": [\n                        \"cpe:2.3:a:hexpm:hex:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"'Elixir.Hex.HTTP.SSL'\"\n                    ],\n                    \"packageName\": \"hex\",\n                    \"packageURL\": \"pkg:otp/hex?repository_url=https:%2F%2Fgithub.com%2Fhexpm%2Fhex&vcs_url=repository_url=git%2Bhttps:%2F%2Fgithub.com%2Fhexpm%2Fhex.git\",\n                    \"product\": \"hex\",\n                    \"programFiles\": [\n                        \"lib/hex/http/ssl.ex\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"'Elixir.Hex.HTTP.SSL':ssl_opts/1\"\n                        },\n                        {\n                            \"name\": \"'Elixir.Hex.HTTP.SSL':partial_chain/2\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/hexpm/hex\",\n                    \"vendor\": \"hexpm\",\n                    \"versions\": [\n                        {\n                            \"lessThan\": \"2.5.2\",\n                            \"status\": \"affected\",\n                            \"version\": \"0.20.2\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"https://github.com","name":"hexpm/hex","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"collectionURL\": \"https://github.com\",\n                    \"cpes\": [\n                        \"cpe:2.3:a:hexpm:hex:*:*:*:*:*:*:*:*\"\n                    ],\n                    \"defaultStatus\": \"unaffected\",\n                    \"modules\": [\n                        \"'Elixir.Hex.HTTP.SSL'\"\n                    ],\n                    \"packageName\": \"hexpm/hex\",\n                    \"packageURL\": \"pkg:github/hexpm/hex\",\n                    \"product\": \"hex\",\n                    \"programFiles\": [\n                        \"lib/hex/http/ssl.ex\"\n                    ],\n                    \"programRoutines\": [\n                        {\n                            \"name\": \"'Elixir.Hex.HTTP.SSL':ssl_opts/1\"\n                        },\n                        {\n                            \"name\": \"'Elixir.Hex.HTTP.SSL':partial_chain/2\"\n                        }\n                    ],\n                    \"repo\": \"https://github.com/hexpm/hex\",\n                    \"vendor\": \"hexpm\",\n                    \"versions\": [\n                        {\n                            \"changes\": [\n                                {\n                                    \"at\": \"5f5a2136c7cf5991b6e8a30d645ca9f8e74b0785\",\n                                    \"status\": \"unaffected\"\n                                },\n                                {\n                                    \"at\": \"6232a6498015e559743bec4f4fbec9138837cec8\",\n                                    \"status\": \"unaffected\"\n                                }\n                            ],\n                            \"lessThan\": \"*\",\n                            \"status\": \"affected\",\n                            \"version\": \"c9b26a46928bfcd546773571e09c1d05f4cd9fb7\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"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","score":5.9,"severity":"MEDIUM"}],"references":["https://github.com/hexpm/hex/security/advisories/GHSA-rw8q-hg7m-cxgr","https://cna.erlef.org/cves/CVE-2026-103503.html","https://osv.dev/vulnerability/EEF-CVE-2026-103503","https://github.com/hexpm/hex/commit/c9b26a46928bfcd546773571e09c1d05f4cd9fb7","https://github.com/hexpm/hex/commit/5f5a2136c7cf5991b6e8a30d645ca9f8e74b0785","https://github.com/hexpm/hex/commit/6232a6498015e559743bec4f4fbec9138837cec8"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-103503","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-103503","identifiers":["CVE-2026-103503"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-09T09:04:02.9162191+00:00","complete":true,"records":1769,"lastAttemptAt":"2026-11-09T09:04:02.9162191+00:00","lastSuccessAt":"2026-11-09T09:04:03.0760313+00:00","error":null,"lastVerifiedAt":"2026-11-09T09:04:03.0760345+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-24e6fde7b744113daefb8f6135035fb8a5c69c9617c9c0d40574a0376532ffd3-0ea295a9c399a04b3ab57ccec2161d0d1cc039ee9ab5c4d8b6299048bd56b277","complete":true,"records":421333,"lastAttemptAt":"2026-11-09T09:02:14.7013141+00:00","lastSuccessAt":"2026-11-09T09:02:14.6291653+00:00","error":null,"lastVerifiedAt":"2026-11-09T09:02:14.7013141+00:00","snapshotPublishedAt":"2026-11-09T08:31:17+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-f975b42a7c2d46f6899c3d764d777217","complete":false,"records":13654,"lastAttemptAt":"2026-11-09T09:16:12.2541949+00:00","lastSuccessAt":"2026-11-09T09:16:12.249+00:00","error":"7 identifier lookups failed; latest failures include HTTP 403. Other identifiers were checked independently.","lastVerifiedAt":"2026-11-09T09:16:12.249+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13699,"expectedIdentifiers":13706,"failedIdentifiers":7},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-09T09:04:02.9162191+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-09T09:04:02.9162191+00:00","lastSuccessAt":"2026-11-09T09:04:03.197028+00:00","error":null,"lastVerifiedAt":"2026-11-09T09:04:03.1970284+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-156d67f0b09643159ff4bd684ee896db","complete":true,"records":13666,"lastAttemptAt":"2026-11-09T09:04:03.6692263+00:00","lastSuccessAt":"2026-11-09T07:04:26.209+00:00","error":null,"lastVerifiedAt":"2026-11-09T07:04:26.209+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13706,"expectedIdentifiers":13706,"failedIdentifiers":0},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-980593e6977a6d1b4fb1eed5a1ffe88a468736f89f0a06f710924ad59132c023","complete":true,"records":9914,"lastAttemptAt":"2026-11-09T09:04:02.7750454+00:00","lastSuccessAt":"2026-11-08T11:07:07.068788+00:00","error":null,"lastVerifiedAt":"2026-11-09T09:04:02.7750454+00:00","snapshotPublishedAt":"2026-11-08T11:02:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-fde804134ecdda0ddd5ff5c26ee1fff5a6fa659311f7ef2e51c6ad54964db0e2","complete":true,"records":1971,"lastAttemptAt":"2026-11-09T09:02:14.7586225+00:00","lastSuccessAt":"2026-11-06T19:03:17.0399903+00:00","error":null,"lastVerifiedAt":"2026-11-09T09:02:14.7586225+00:00","snapshotPublishedAt":"2026-11-06T18:17:57+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-f6d341f4320a5a0c059c28102ee651c3dd06abc87b84d2bafa4e2a823ec07d35","complete":true,"records":3056,"lastAttemptAt":"2026-11-09T09:04:02.8843128+00:00","lastSuccessAt":"2026-11-09T05:02:23.1539412+00:00","error":null,"lastVerifiedAt":"2026-11-09T09:04:02.8843128+00:00","snapshotPublishedAt":"2026-11-09T04:47:48+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-d0592215f99679f1cc533698c7c7cf50c306057d38021110cecb15015dc78137","complete":true,"records":231297,"lastAttemptAt":"2026-11-09T09:04:02.4970329+00:00","lastSuccessAt":"2026-11-09T09:04:00.7848047+00:00","error":null,"lastVerifiedAt":"2026-11-09T09:04:02.4970329+00:00","snapshotPublishedAt":"2026-11-09T08:33:22+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}