libgcrypt: Fix of CVE-2021-33560

{
  "id": "84e365272b7fba8284454244f9e7a286d83878ff0c2be22ce38ea3ec5ca14a41",
  "url": "https://osv.dev/vulnerability/CLSA-2026-1782731604",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "libgcrypt: Fix of CVE-2021-33560",
    "summary": "- CVE-2013-4576: Normalize the MPIs to prevent possible side-channel attacks - CVE-2014-3591: Use ciphertext blinding for Elgamal to prevent possible side-channel attacks - CVE-2021-33560: Use of smaller K for ephemeral key in ElGamal prevent generation of weak keys - CVE-2021-40528: Add exponent blinding as well to mitigate side-channel attack on mpi_powm - tests: Add a benchmark for Elgamal",
    "evidence": "osv:CLSA-2026-1782731604",
    "products": [
      {
        "name": {
          "value": "libgcrypt",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.5.3-14.el7.tuxcare.els1",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      },
      {
        "name": {
          "value": "libgcrypt-devel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.5.3-14.el7.tuxcare.els1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CLSA-2026-1782731604",
      "aliases": [
        "CLSA-2026-1782731604"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.5.3-14.el7.tuxcare.els1"
                }
              ]
            }
          ],
          "package": {
            "name": "libgcrypt",
            "purl": "pkg:rpm/tuxcare/libgcrypt?distro=oraclelinux-7",
            "ecosystem": "TuxCare:OracleLinux:7"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/oraclelinux7els/CLSA-2026-1782731604.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1.5.3-14.el7.tuxcare.els1"
                }
              ]
            }
          ],
          "package": {
            "name": "libgcrypt-devel",
            "purl": "pkg:rpm/tuxcare/libgcrypt-devel?distro=oraclelinux-7",
            "ecosystem": "TuxCare:OracleLinux:7"
          },
          "database_specific": {
            "source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/oraclelinux7els/CLSA-2026-1782731604.json"
          }
        }
      ],
      "modified": "2026-10-26T09:43:35.904800852Z",
      "provider": "osv",
      "upstream": [
        "CVE-2013-4576",
        "CVE-2014-3591",
        "CVE-2021-33560",
        "CVE-2021-40528"
      ],
      "references": [
        "https://errata.tuxcare.com/els_os/oraclelinux7els/CLSA-2026-1782731604.html",
        "https://nvd.nist.gov/vuln/detail/CVE-2021-33560"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2013-4576",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2014-3591",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2021-33560",
        "evidence": "/upstream"
      },
      {
        "value": "CVE-2021-40528",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 450018,
  "published_at": "2026-06-29T11:13:40+00:00"
}