Vulnerability-Lookup

GHSA-JV46-XFWM-36J7

Vulnerability from github – Published: 2026-06-26 21:05 – Updated: 2026-06-26 21:05

Summary

Relyra SAML SignatureValue not cryptographically verified -> authentication bypass

Details

Summary

Relyra 1.0.0 and 1.1.0 accept forged SAML signatures because SignatureValue was not cryptographically verified before the library returned a successful authentication result.

Details

In 1.0.0 and 1.1.0, the XMLDSig trust boundary was incomplete. :public_key.verify over the exclusive-C14N canonicalized SignedInfo was not performed against the configured IdP certificate's public key, DigestValue was not recomputed over the canonicalized referenced element, and canonicalize/2 remained an unused passthrough in the signature-verification path. The result was a structure-only acceptance path where document shape and trust-source rejection could succeed without proving the signature bytes.

Impact

A forged SignatureValue carrying an attacker-controlled NameID can be accepted as {:ok}. Any relying-party application using Relyra 1.0.0 or 1.1.0 can be logged into as an arbitrary user if it trusts the affected response path.

Patches

Relyra 1.2.0 closes the gap with real exclusive-C14N canonicalization, :public_key.verify against the configured IdP certificate's public key, and a constant-time DigestValue recompute/compare bound to the exact consumed node on both verify/4 and verify_metadata_root/4.

Workarounds

There is no safe configuration of 1.0.0 or 1.1.0. Upgrade to 1.2.0 or later.

Resources

Fix commit 2e45689 (wire real XMLDSig crypto into the candidate arm)
Fix commit 8910200 (close metadata trust bypass, pin over DER)
Regression proof: test/security/xml/adversarial_crypto_test.exs, test/relyra/metadata/auto_refresh_test.exs, test/security/ci_gate_integrity_test.exs

Severity

9.1 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Hex",
        "name": "relyra"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.0"
            },
            {
              "fixed": "1.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-49454"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287",
      "CWE-347"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-26T21:05:13Z",
    "nvd_published_at": "2026-06-18T21:16:29Z",
    "severity": "CRITICAL"
  },
  "details": "## Summary\n\nRelyra `1.0.0` and `1.1.0` accept forged SAML signatures because `SignatureValue` was not cryptographically verified before the library returned a successful authentication result.\n\n## Details\n\nIn `1.0.0` and `1.1.0`, the XMLDSig trust boundary was incomplete. `:public_key.verify` over the exclusive-C14N canonicalized `SignedInfo` was not performed against the configured IdP certificate\u0027s public key, `DigestValue` was not recomputed over the canonicalized referenced element, and `canonicalize/2` remained an unused passthrough in the signature-verification path. The result was a structure-only acceptance path where document shape and trust-source rejection could succeed without proving the signature bytes.\n\n## Impact\n\nA forged `SignatureValue` carrying an attacker-controlled `NameID` can be accepted as `{:ok}`. Any relying-party application using Relyra `1.0.0` or `1.1.0` can be logged into as an arbitrary user if it trusts the affected response path.\n\n## Patches\n\nRelyra `1.2.0` closes the gap with real exclusive-C14N canonicalization, `:public_key.verify` against the configured IdP certificate\u0027s public key, and a constant-time `DigestValue` recompute/compare bound to the exact consumed node on both `verify/4` and `verify_metadata_root/4`.\n\n## Workarounds\n\nThere is no safe configuration of `1.0.0` or `1.1.0`. Upgrade to `1.2.0` or later.\n\n## Resources\n\n- Fix commit `2e45689` (wire real XMLDSig crypto into the candidate arm)\n- Fix commit `8910200` (close metadata trust bypass, pin over DER)\n- Regression proof: `test/security/xml/adversarial_crypto_test.exs`, `test/relyra/metadata/auto_refresh_test.exs`, `test/security/ci_gate_integrity_test.exs`",
  "id": "GHSA-jv46-xfwm-36j7",
  "modified": "2026-06-26T21:05:13Z",
  "published": "2026-06-26T21:05:13Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/szTheory/relyra/security/advisories/GHSA-jv46-xfwm-36j7"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49454"
    },
    {
      "type": "WEB",
      "url": "https://github.com/szTheory/relyra/commit/2e456897af3158c175bb490ce7fc51d6241c8922"
    },
    {
      "type": "WEB",
      "url": "https://github.com/szTheory/relyra/commit/8910200"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/szTheory/relyra"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Relyra SAML SignatureValue not cryptographically verified -\u003e authentication bypass"
}

CVE-2026-49454 (GCVE-0-2026-49454)

Vulnerability from cvelistv5 – Published: 2026-06-18 20:52 – Updated: 2026-06-22 15:51

Title

Relyra SAML SignatureValue not cryptographically verified -> authentication bypass

Summary

Relyra is a strict-by-default SAML 2.0 Service Provider library for Elixir and Phoenix. Versions 1.0.0 and 1.1.0 accept forged SAML signatures because SignatureValue was not cryptographically verified before the library returned a successful authentication result. The XMLDSig trust boundary was incomplete as :public_key.verify over the exclusive-C14N canonicalized SignedInfo was not performed against the configured IdP certificate's public key, DigestValue was not recomputed over the canonicalized referenced element, and canonicalize/2 remained an unused passthrough in the signature-verification path. The result was a structure-only acceptance path where document shape and trust-source rejection could succeed without proving the signature bytes. A forged SignatureValue carrying an attacker-controlled NameID could be accepted as {:ok}. This issue has been fixed in version 1.2.0.

Severity

9.1 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-287 - Improper Authentication
CWE-347 - Improper Verification of Cryptographic Signature

Assigner

GitHub_M

References

3 references

URL	Tags
https://github.com/szTheory/relyra/security/advis…	x_refsource_CONFIRM
https://github.com/szTheory/relyra/commit/2e45689…	x_refsource_MISC
https://github.com/szTheory/relyra/commit/8910200	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
szTheory	relyra	Affected: >= 1.0.0, < 1.2.0

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-49454",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-22T15:50:42.585285Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-22T15:51:42.595Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "relyra",
          "vendor": "szTheory",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.0.0, \u003c 1.2.0"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Relyra is a strict-by-default SAML 2.0 Service Provider library for Elixir and Phoenix. Versions 1.0.0 and 1.1.0 accept forged SAML signatures because SignatureValue was not cryptographically verified before the library returned a successful authentication result. The XMLDSig trust boundary was incomplete as :public_key.verify over the exclusive-C14N canonicalized SignedInfo was not performed against the configured IdP certificate\u0027s public key, DigestValue was not recomputed over the canonicalized referenced element, and canonicalize/2 remained an unused passthrough in the signature-verification path. The result was a structure-only acceptance path where document shape and trust-source rejection could succeed without proving the signature bytes. A forged SignatureValue carrying an attacker-controlled NameID could be accepted as {:ok}. This issue has been fixed in version 1.2.0."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-287",
              "description": "CWE-287: Improper Authentication",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-347",
              "description": "CWE-347: Improper Verification of Cryptographic Signature",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-18T20:52:22.605Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/szTheory/relyra/security/advisories/GHSA-jv46-xfwm-36j7",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/szTheory/relyra/security/advisories/GHSA-jv46-xfwm-36j7"
        },
        {
          "name": "https://github.com/szTheory/relyra/commit/2e456897af3158c175bb490ce7fc51d6241c8922",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/szTheory/relyra/commit/2e456897af3158c175bb490ce7fc51d6241c8922"
        },
        {
          "name": "https://github.com/szTheory/relyra/commit/8910200",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/szTheory/relyra/commit/8910200"
        }
      ],
      "source": {
        "advisory": "GHSA-jv46-xfwm-36j7",
        "discovery": "UNKNOWN"
      },
      "title": "Relyra SAML SignatureValue not cryptographically verified -\u003e authentication bypass"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-49454",
    "datePublished": "2026-06-18T20:52:22.605Z",
    "dateReserved": "2026-05-30T02:43:33.107Z",
    "dateUpdated": "2026-06-22T15:51:42.595Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-JV46-XFWM-36J7

Summary

Details

Impact

Patches

Workarounds

Resources

CVE-2026-49454 (GCVE-0-2026-49454)

Tags

Sightings

Nomenclature