CVE-2026-96760 (GCVE-0-2026-96760)

Vulnerability from cvelistv5 – Published: 2026-09-28 19:37 – Updated: 2026-09-28 20:07
VLAI
Title
Authlib library contains a signature‑verification bypass vulnerability
Summary
Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability. The JsonWebSignature.deserialize_json() method accepts a JSON Serialization JWS object and returns the payload as successfully verified without checking for a signature and without requiring a cryptographic key.
Severity
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Authlib Authlib Affected: 1.7.2
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-09-28T20:07:57.835Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://www.kb.cert.org/vuls/id/762428"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Authlib",
          "vendor": "Authlib",
          "versions": [
            {
              "status": "affected",
              "version": "1.7.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability. The JsonWebSignature.deserialize_json() method accepts a JSON Serialization JWS object and returns the payload as successfully verified without checking for a signature and without requiring a cryptographic key."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-347 Improper Verification of Cryptographic Signature",
              "lang": "en"
            }
          ]
        },
        {
          "descriptions": [
            {
              "description": "CWE-670 Always-Incorrect Control Flow Implementation",
              "lang": "en"
            }
          ]
        },
        {
          "descriptions": [
            {
              "description": "CWE-358 Improperly Implemented Security Check for Standard",
              "lang": "en"
            }
          ]
        },
        {
          "descriptions": [
            {
              "description": "CWE-20 Improper Input Validation",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-28T19:37:58.973Z",
        "orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
        "shortName": "certcc"
      },
      "references": [
        {
          "url": "https://github.com/authlib/authlib"
        },
        {
          "url": "https://kb.cert.org/vuls/id/762428"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Authlib library contains a signature\u2011verification bypass vulnerability",
      "x_generator": {
        "engine": "VINCE 3.0.49",
        "env": "prod",
        "origin": "https://cveawg.mitre.org/api/cve/CVE-2026-96760"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b",
    "assignerShortName": "certcc",
    "cveId": "CVE-2026-96760",
    "datePublished": "2026-09-28T19:37:58.973Z",
    "dateReserved": "2026-09-23T15:59:27.145Z",
    "dateUpdated": "2026-09-28T20:07:57.835Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "Authlib",
                "vendor": "Authlib",
                "versions": [
                  {
                    "status": "affected",
                    "version": "1.7.2"
                  }
                ]
              }
            ],
            "source": "cret@cert.org"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Authlib (v1.7.2 and below) contains a signature verification bypass vulnerability. The JsonWebSignature.deserialize_json() method accepts a JSON Serialization JWS object and returns the payload as successfully verified without checking for a signature and without requiring a cryptographic key."
          }
        ],
        "id": "CVE-2026-96760",
        "lastModified": "2026-09-28T21:17:19.650",
        "metrics": {},
        "published": "2026-09-28T20:17:11.703",
        "references": [
          {
            "source": "cret@cert.org",
            "url": "https://github.com/authlib/authlib"
          },
          {
            "source": "cret@cert.org",
            "url": "https://kb.cert.org/vuls/id/762428"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://www.kb.cert.org/vuls/id/762428"
          }
        ],
        "sourceIdentifier": "cret@cert.org",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-09-28T20:56:19+00:00",
      "cve": "CVE-2026-96760",
      "id": "CVE-2026-96760",
      "initial_release_date": "2026-09-28T19:37:58.973000+00:00",
      "product_status:known_affected": "11",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "authlib: authlib: Signature verification bypass via deserialize_json",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-96760.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.