{"id":"CVE-2026-74876","aliases":["GHSA-8h88-gxp3-j7pg","PYSEC-2026-3756"],"url":"https://o3.security/vulnerability/CVE-2026-74876","summary":"openssl_encrypt before 1.4.0 Unverified Key Bundle Encryption","details":"### Summary\n\nThe `PublicKeyBundle.from_dict()` method in `openssl_encrypt/modules/key_bundle.py` at **lines 329-361** creates bundles from untrusted data without verifying the signature. The docstring warns to call `verify_signature()` after creation, but the `to_identity()` method (line 363-391) can convert an unverified bundle directly to an `Identity` object.\n\n### Affected Code\n\n```python\n@classmethod\ndef from_dict(cls, data: Dict) -> \"PublicKeyBundle\":\n    \"\"\"\n    SECURITY: Does NOT verify signature. Call verify_signature() after creation.\n    \"\"\"\n    # Creates bundle without verification\n```\n\n### Impact\n\nIf `from_dict()` followed by `to_identity()` is called without an intervening `verify_signature()` call, encryption could be performed against an attacker's public key, leaking secrets. While `key_resolver.py` (lines 146-147) does verify before use, the unguarded API path remains directly callable.\n\n### Recommended Fix\n\n- Add a `verified` flag to `PublicKeyBundle` that must be set before `to_identity()` can be called\n- Or have `to_identity()` automatically call `verify_signature()` and raise on failure\n- Or make `from_dict()` require verification as part of construction\n\n### Fix\n\nFixed in commit `f4a1ba6` on branch `releases/1.4.x` — from_dict() now verifies self_signature by default (verify=True parameter); raises ValueError on verification failure.","published":"2026-08-17T11:04:44.249Z","modified":"2026-10-28T02:30:21.070838027Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"openssl-encrypt","fixedVersion":"1.4.0"}],"fix":{"url":"https://github.com/jahlives/openssl_encrypt/commit/f4a1ba660063cd9e17883829e5272a248525a16b","label":"jahlives/openssl_encrypt@f4a1ba6"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74876.json"},{"type":"ADVISORY","url":"https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-8h88-gxp3-j7pg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74876"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/openssl-encrypt-before-unverified-key-bundle-encryption"},{"type":"WEB","url":"https://github.com/jahlives/openssl_encrypt/commit/f4a1ba660063cd9e17883829e5272a248525a16b"},{"type":"PACKAGE","url":"https://github.com/jahlives/openssl_encrypt"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:21.070838027Z"}}