{
  "cveId": "CVE-2025-49600",
  "url": "https://patchblox.com/security/cve/CVE-2025-49600",
  "summary": "CVE-2025-49600 is fixed in mbedtls on 1 platform, first by DEBIAN-CVE-2025-49600, released July 4, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "mbedtls: In MbedTLS 3.3.0 before 3.6.4, mbedtls_lms_verify may accept invalid signatures if hash computation fails and interna...",
  "description": "In MbedTLS 3.3.0 before 3.6.4, mbedtls_lms_verify may accept invalid signatures if hash computation fails and internal errors go unchecked, enabling LMS (Leighton-Micali Signature) forgery in a fault scenario. Specifically, unchecked return values in mbedtls_lms_verify allow an attacker (who can induce a hardware hash accelerator fault) to bypass LMS signature verification by reusing stale stack data, resulting in acceptance of an invalid signature. In mbedtls_lms_verify, the return values of the internal Merkle tree functions create_merkle_leaf_value and create_merkle_internal_value are not checked. These functions return an integer that indicates whether the call succeeded or not. If a failure occurs, the output buffer (Tc_candidate_root_node) may remain uninitialized, and the result of the signature verification is unpredictable. When the software implementation of SHA-256 is used, these functions will not fail. However, with hardware-accelerated hashing, an attacker could use fault injection against the accelerator to bypass verification.",
  "published": "2025-07-04T15:15:22Z",
  "severity": "medium",
  "cvss": 4.9,
  "cvssVector": "CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N",
  "epss": 0.00158,
  "epssPercentile": 0.05003,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "mbedtls",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "3.6.4-1",
      "fix": "DEBIAN-CVE-2025-49600",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-49600",
      "released": "2025-07-04T15:15:22Z"
    },
    {
      "platform": "linux",
      "product": "mbedtls",
      "release": "Debian 14",
      "fixedVersion": "3.6.4-1",
      "fix": "DEBIAN-CVE-2025-49600",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-49600",
      "released": "2025-07-04T15:15:22Z"
    },
    {
      "platform": "linux",
      "product": "mbedtls",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "3.6.6-bp160.1.1",
      "fix": "OPENSUSE-SU-2026:21144-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21144-1",
      "released": "2026-06-22T13:34:13Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}