AEADs/ascon-aead: Plaintext exposed in decrypt_in_place_detached even on tag verification failure

{
  "id": "8bfd928219a5309a64a15451a5b2f7f3be66528578d186f74f6329c85c1c21aa",
  "url": "https://osv.dev/vulnerability/CVE-2025-27498",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "AEADs/ascon-aead: Plaintext exposed in decrypt_in_place_detached even on tag verification failure",
    "summary": "aes-gcm is a pure Rust implementation of the AES-GCM. In decrypt_in_place_detached, the decrypted ciphertext (which is the correct ciphertext) is exposed even if the tag is incorrect. This is because in decrypt_inplace in asconcore.rs, tag verification causes an error to be returned with the plaintext contents still in buffer. The vulnerability is fixed in 0.4.3.",
    "evidence": "osv:CVE-2025-27498",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2025-27498",
      "aliases": [
        "CVE-2025-27498",
        "GHSA-r38m-44fw-h886"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:A/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/rustcrypto/aeads",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "ff0118562dc56007099e9e19874855c9ecd75f90"
                },
                {
                  "fixed": "d1d749ba57e38e65b0e037cd744d0b17f7254037"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.4.3"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d1d749ba57e38e65b0e037cd744d0b17f7254037"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "mgm-v0.4.2",
            "ccm-v0.4.3",
            "ccm-v0.4.2",
            "ccm-v0.4.1",
            "aes-siv-v0.6.1",
            "deoxys-v0.0.1",
            "aes-gcm-siv-v0.10.1",
            "aes-gcm-v0.9.2",
            "mgm-v0.4.1",
            "aes-gcm-v0.9.1",
            "mgm-v0.4.0",
            "eax-v0.4.0",
            "aes-siv-v0.6.0",
            "aes-gcm-siv-v0.10.0",
            "crypto_box-v0.6.0",
            "xsalsa20poly1305-v0.7.1",
            "ccm-v0.4.0",
            "xsalsa20poly1305-v0.7.0",
            "chacha20poly1305-v0.8.0",
            "aes-gcm-v0.9.0",
            "chacha20poly1305-v0.7.1",
            "xsalsa20poly1305-v0.6.0",
            "mgm-v0.3.0",
            "eax-v0.3.0",
            "crypto_box-v0.5.0",
            "chacha20poly1305-v0.7.0",
            "ccm-v0.3.0",
            "aes-siv-v0.5.0",
            "aes-gcm-v0.8.0",
            "aes-gcm-siv-v0.9.0",
            "eax-v0.2.0",
            "xsalsa20poly1305-v0.5.0",
            "crypto_box-v0.4.0",
            "chacha20poly1305-v0.6.0",
            "ccm-v0.2.0",
            "aes-siv-v0.4.0",
            "aes-gcm-v0.7.0",
            "aes-gcm-siv-v0.8.0",
            "crypto_box-v0.3.0",
            "mgm-v0.2.1",
            "mgm-v0.2.0",
            "mgm-v0.1.1",
            "mgm-v0.1.0",
            "ccm-v0.1.0",
            "xsalsa20poly1305-v0.4.2",
            "xsalsa20poly1305-v0.4.1",
            "chacha20poly1305-v0.5.1",
            "crypto_box-v0.2.0",
            "xsalsa20poly1305-v0.4.0",
            "chacha20poly1305-v0.5.0",
            "aes-siv-v0.3.0",
            "aes-gcm-siv-v0.5.0",
            "aes-gcm-v0.6.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-27498.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.847224512Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27498.json",
        "https://github.com/RustCrypto/AEADs/security/advisories/GHSA-r38m-44fw-h886",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-27498",
        "https://github.com/RustCrypto/AEADs/commit/d1d749ba57e38e65b0e037cd744d0b17f7254037"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-347"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27498.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-27498",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494259,
  "published_at": "2025-03-03T16:52:02.75+00:00"
}