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          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/07/17/11"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://cpan.org/modules",
          "defaultStatus": "unaffected",
          "packageName": "Mojo-JWT",
          "product": "Mojo::JWT",
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          "programRoutines": [
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              "name": "Mojo::JWT::decode"
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          "repo": "http://github.com/jberger/Mojo-JWT",
          "vendor": "JBERGER",
          "versions": [
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              "lessThan": "1.02",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Mojo::JWT versions before 1.02 for Perl verify HMAC signatures with a non-constant-time string comparison.\n\nThe decode() method compares the supplied signature to the recomputed HMAC with Perl\u0027s eq operator, which stops at the first differing byte, so the comparison time varies with the number of matching leading bytes.\n\nA caller that decodes attacker supplied tokens leaks the expected signature through this timing variation, which can be aggregated over many requests to recover the signature and forge a token."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-208",
              "description": "CWE-208 Observable Timing Discrepancy",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-17T15:29:58.088Z",
        "orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e",
        "shortName": "CPANSec"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/jberger/Mojo-JWT/commit/b8aefb846613e44b5b12bc170898ffd5b05094a2.patch"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to Mojo-JWT 1.02, which compares signatures with the constant-time Mojo::Util::secure_compare."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Mojo::JWT versions before 1.02 for Perl verify HMAC signatures with a non-constant-time string comparison",
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    "assignerShortName": "CPANSec",
    "cveId": "CVE-2026-9537",
    "datePublished": "2026-07-17T15:29:58.088Z",
    "dateReserved": "2026-05-25T20:46:44.842Z",
    "dateUpdated": "2026-07-17T17:25:14.154Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-9537",
      "date": "2026-07-19",
      "epss": "0.00174",
      "percentile": "0.0705"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-9537\",\"sourceIdentifier\":\"9b29abf9-4ab0-4765-b253-1875cd9b441e\",\"published\":\"2026-07-17T16:17:20.417\",\"lastModified\":\"2026-07-17T18:17:17.603\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Mojo::JWT versions before 1.02 for Perl verify HMAC signatures with a non-constant-time string comparison.\\n\\nThe decode() method compares the supplied signature to the recomputed HMAC with Perl\u0027s eq operator, which stops at the first differing byte, so the comparison time varies with the number of matching leading bytes.\\n\\nA caller that decodes attacker supplied tokens leaks the expected signature through this timing variation, which can be aggregated over many requests to recover the signature and forge a token.\"}],\"affected\":[{\"source\":\"9b29abf9-4ab0-4765-b253-1875cd9b441e\",\"affectedData\":[{\"vendor\":\"JBERGER\",\"product\":\"Mojo::JWT\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://cpan.org/modules\",\"packageName\":\"Mojo-JWT\",\"programFiles\":[\"lib/Mojo/JWT.pm\"],\"programRoutines\":[{\"name\":\"Mojo::JWT::decode\"}],\"repo\":\"http://github.com/jberger/Mojo-JWT\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"1.02\",\"versionType\":\"custom\",\"status\":\"affected\"}]}]}],\"metrics\":{},\"weaknesses\":[{\"source\":\"9b29abf9-4ab0-4765-b253-1875cd9b441e\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-208\"}]}],\"references\":[{\"url\":\"https://github.com/jberger/Mojo-JWT/commit/b8aefb846613e44b5b12bc170898ffd5b05094a2.patch\",\"source\":\"9b29abf9-4ab0-4765-b253-1875cd9b441e\"},{\"url\":\"http://www.openwall.com/lists/oss-security/2026/07/17/11\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "redhat_vex": {
      "current_release_date": "2026-07-18T20:31:41+00:00",
      "cve": "CVE-2026-9537",
      "id": "CVE-2026-9537",
      "initial_release_date": "2026-07-17T15:29:58.088000+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "perl-Mojo-JWT: verification of HMAC signatures with a non-constant-time string comparison",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9537.json",
      "version": "3"
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}