GHSA-MPMC-QCHH-R9Q8

Vulnerability from github – Published: 2025-12-08 21:30 – Updated: 2025-12-12 19:39
VLAI?
Summary
Altcha Proof-of-Work obfuscation mode cryptanalytic break
Details

A cryptanalytic break in Altcha Proof-of-Work obfuscation mode version 0.8.0 and later allows for remote visitors to recover the Proof-of-Work nonce in constant time via mathematical deduction.

Severity ?
5.5 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P
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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "altcha"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.8.0"
            },
            {
              "last_affected": "2.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-65849"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-327"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-12-09T14:26:12Z",
    "nvd_published_at": "2025-12-08T19:15:50Z",
    "severity": "MODERATE"
  },
  "details": "A cryptanalytic break in Altcha Proof-of-Work obfuscation mode version 0.8.0 and later allows for remote visitors to recover the Proof-of-Work nonce in constant time via mathematical deduction.",
  "id": "GHSA-mpmc-qchh-r9q8",
  "modified": "2025-12-12T19:39:35Z",
  "published": "2025-12-08T21:30:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-65849"
    },
    {
      "type": "WEB",
      "url": "https://altcha.org/docs/v2/obfuscation"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/altcha-org/altcha"
    },
    {
      "type": "WEB",
      "url": "https://github.com/altcha-org/altcha/blob/154f874cbcdd4e639783463130d13988a2bd1bdc/src/helpers.ts#L170-L194"
    },
    {
      "type": "WEB",
      "url": "https://github.com/eternal-flame-AD/altcha-deobfs"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Altcha Proof-of-Work obfuscation mode cryptanalytic break"
}


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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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