CVE-2026-118986

Full vulnerability record from the local CVENow database.

Description

CallBackery versions before 0.62.0 for Perl allow session cookie forgery via a signing secret generated with rand(). The secret that signs session cookies is built from two calls to the built-in rand(), which is seeded with 32 bits. The secret therefore has at most 2**32 possible values, and one signed cookie is enough to test each candidate offline. An attacker who obtains a single session cookie can recover the secret and sign cookies for any user, including an administrator.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

9b29abf9-4ab0-4765-b253-1875cd9b441e

Published

2026-10-30 14:16:41.543000

Last modified

2026-10-30 14:16:41.543000

View original CVE JSON

{
  "id": "CVE-2026-118986",
  "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
  "published": "2026-10-30T14:16:41.543",
  "lastModified": "2026-10-30T14:16:41.543",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "CallBackery versions before 0.62.0 for Perl allow session cookie forgery via a signing secret generated with rand().\n\nThe secret that signs session cookies is built from two calls to the built-in rand(), which is seeded with 32 bits. The secret therefore has at most 2**32 possible values, and one signed cookie is enough to test each candidate offline.\n\nAn attacker who obtains a single session cookie can recover the secret and sign cookies for any user, including an administrator."
    }
  ],
  "affected": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "collectionURL": "https://cpan.org/modules",
          "packageName": "CallBackery",
          "modules": [
            "CallBackery"
          ],
          "programFiles": [
            "lib/CallBackery/Config.pm"
          ],
          "programRoutines": [
            {
              "name": "CallBackery::Config::secretFile"
            },
            {
              "name": "CallBackery::Config::reConfigure"
            }
          ],
          "repo": "https://github.com/oetiker/callbackery",
          "packageURL": "pkg:cpan/CallBackery",
          "versions": [
            {
              "version": "0",
              "lessThan": "0.62.0",
              "versionType": "custom",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "weaknesses": [
    {
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-338"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://metacpan.org/release/OETIKER/CallBackery-0.62.0/changes",
      "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"
    }
  ]
}