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    PYSEC-2026-3962

    Vulnerability from pysec - Published: 2026-08-27 17:21 - Updated: 2026-09-10 12:38
    VLAI
    Details

    openssl_encrypt before 1.4.9 fails to re-derive and validate fingerprints when loading identities from identity.json, allowing attackers to substitute public keys in identity stores. Attackers can replace legitimate public keys with their own while maintaining the claimed fingerprint, enabling silent key substitution where encryption uses attacker keys and signature verification appears valid.

    Impacted products
    Name purl
    openssl-encrypt pkg:pypi/openssl-encrypt

    {
      "affected": [
        {
          "ecosystem_specific": {},
          "package": {
            "ecosystem": "PyPI",
            "name": "openssl-encrypt",
            "purl": "pkg:pypi/openssl-encrypt"
          },
          "ranges": [
            {
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.4.9"
                }
              ],
              "type": "ECOSYSTEM"
            }
          ],
          "versions": [
            "0.2.2",
            "0.2.3",
            "0.2.4",
            "0.2.5",
            "0.2.6",
            "0.3.0",
            "0.3.1",
            "0.3.2",
            "0.3.3",
            "0.4.0",
            "0.4.1",
            "0.4.2",
            "0.4.3",
            "0.4.4",
            "0.5.0",
            "0.5.1",
            "0.5.3",
            "0.6.0rc1",
            "0.7.0rc2",
            "0.7.1",
            "0.7.2",
            "0.8.0",
            "0.8.1",
            "0.8.2",
            "0.9.2",
            "1.0.0",
            "1.0.1",
            "1.0.2",
            "1.0.3",
            "1.1.0",
            "1.2.0",
            "1.2.1",
            "1.3.0",
            "1.3.1",
            "1.3.2",
            "1.3.3",
            "1.3.4",
            "1.3.5",
            "1.4.0",
            "1.4.0b3",
            "1.4.0b4",
            "1.4.0b5",
            "1.4.0b6",
            "1.4.0b7",
            "1.4.0b8",
            "1.4.1",
            "1.4.1rc2",
            "1.4.2",
            "1.4.4",
            "1.4.5",
            "1.4.6",
            "1.4.7",
            "1.4.8"
          ]
        }
      ],
      "aliases": [
        "CVE-2026-81702",
        "GHSA-q8p3-7h6h-ghfr"
      ],
      "details": "openssl_encrypt before 1.4.9 fails to re-derive and validate fingerprints when loading identities from identity.json, allowing attackers to substitute public keys in identity stores. Attackers can replace legitimate public keys with their own while maintaining the claimed fingerprint, enabling silent key substitution where encryption uses attacker keys and signature verification appears valid.",
      "id": "PYSEC-2026-3962",
      "modified": "2026-09-10T12:38:49.224680Z",
      "published": "2026-08-27T17:21:00.680Z",
      "references": [
        {
          "type": "ADVISORY",
          "url": "https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-q8p3-7h6h-ghfr"
        },
        {
          "type": "ADVISORY",
          "url": "https://www.vulncheck.com/advisories/openssl-encrypt-before-1.4.9-key-substitution-via-identity-load"
        }
      ],
      "severity": [
        {
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "type": "CVSS_V4"
        }
      ]
    }