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    "cveMetadata": {
        "cveId": "CVE-2026-54906",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-16T13:49:33.556Z",
        "datePublished": "2026-06-24T15:46:01.116Z",
        "dateUpdated": "2026-06-24T17:57:07.650Z"
    },
    "containers": {
        "cna": {
            "title": "concurrent-ruby: ReadWriteLock allows wrong-thread write release and stray read-release counter corruption",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-414",
                            "lang": "en",
                            "description": "CWE-414: Missing Lock Check",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-667",
                            "lang": "en",
                            "description": "CWE-667: Improper Locking",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "LOCAL",
                        "attackComplexity": "HIGH",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "LOW",
                        "vulnAvailabilityImpact": "LOW",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 2.1,
                        "baseSeverity": "LOW",
                        "vectorString": "CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N",
                        "version": "4.0"
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            ],
            "references": [
                {
                    "name": "https://github.com/ruby-concurrency/concurrent-ruby/security/advisories/GHSA-6wx8-w4f5-wwcr",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/ruby-concurrency/concurrent-ruby/security/advisories/GHSA-6wx8-w4f5-wwcr"
                }
            ],
            "affected": [
                {
                    "vendor": "ruby-concurrency",
                    "product": "concurrent-ruby",
                    "versions": [
                        {
                            "version": "< 1.3.7",
                            "status": "affected"
                        }
                    ]
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            ],
            "providerMetadata": {
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                "dateUpdated": "2026-06-24T15:46:01.116Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "concurrent-ruby is a modern concurrency tools for Ruby. Prior to 1.3.7, Concurrent::ReadWriteLock#release_write_lock does not verify that the calling thread acquired the write lock. Any thread with access to the lock object can release an active write lock held by another thread. A second writer can then enter its critical section while the first writer is still running. Concurrent::ReadWriteLock#release_read_lock also decrements the shared counter even when no read lock is held. Calling it on a fresh lock changes the counter from 0 to -1, after which normal read acquisition raises Concurrent::ResourceLimitError. This is a synchronization correctness issue in the public Concurrent::ReadWriteLock API. This vulnerability is fixed in 1.3.7."
                }
            ],
            "source": {
                "advisory": "GHSA-6wx8-w4f5-wwcr",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "references": [
                    {
                        "url": "https://github.com/ruby-concurrency/concurrent-ruby/security/advisories/GHSA-6wx8-w4f5-wwcr",
                        "tags": [
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                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-06-24T17:56:44.670673Z",
                                "id": "CVE-2026-54906",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "Automatable": "no"
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                                        "Technical Impact": "partial"
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}