{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-62959", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-14T22:32:17.732Z", "datePublished": "2026-07-31T19:57:06.394Z", "dateUpdated": "2026-07-31T23:34:33.361Z"}, "containers": {"cna": {"title": "Coturn: Pre-authentication heap memory disclosure in ACME redirect (`try_acme_redirect`)", "problemTypes": [{"descriptions": [{"cweId": "CWE-125", "lang": "en", "description": "CWE-125: Out-of-bounds Read", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-195", "lang": "en", "description": "CWE-195: Signed to Unsigned Conversion Error", "type": "CWE"}]}], "metrics": [{"cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 8.2, "baseSeverity": "HIGH", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N", "version": "4.0"}}], "references": [{"name": "https://github.com/coturn/coturn/security/advisories/GHSA-m23x-5qf5-988g", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/coturn/coturn/security/advisories/GHSA-m23x-5qf5-988g"}, {"name": "https://github.com/coturn/coturn/pull/1965", "tags": ["x_refsource_MISC"], "url": "https://github.com/coturn/coturn/pull/1965"}, {"name": "https://github.com/coturn/coturn/commit/960835886692fa04cf63ddd970c3f330740c87f4", "tags": ["x_refsource_MISC"], "url": "https://github.com/coturn/coturn/commit/960835886692fa04cf63ddd970c3f330740c87f4"}, {"name": "https://github.com/coturn/coturn/releases/tag/4.15.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/coturn/coturn/releases/tag/4.15.0"}], "affected": [{"vendor": "coturn", "product": "coturn", "versions": [{"version": ">= 4.5.2, < 4.15.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-07-31T19:57:06.394Z"}, "descriptions": [{"lang": "en", "value": "Coturn is a free open source implementation of TURN and STUN Server. From 4.5.2 through 4.14.0, when Coturn is started with --acme-redirect <URL> and exposes a plaintext-TCP listener, an unauthenticated remote client can send a single ordinary HTTP GET request and receive a 301 response whose Location header contains up to ~870 bytes of adjacent process heap memory. The leaked region is a recycled network receive buffer that is reused without being zeroed, so on a busy server it can contain data from other clients' requests (TURN credentials, OAuth tokens, relayed payloads). Root cause is a signed\u2192unsigned conversion. This issue is fixed in version 4.15.0."}], "source": {"advisory": "GHSA-m23x-5qf5-988g", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/coturn/coturn/security/advisories/GHSA-m23x-5qf5-988g", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-31T23:34:10.861030Z", "id": "CVE-2026-62959", "options": [{"Exploitation": "poc"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-31T23:34:33.361Z"}}]}}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.5.2,4.15.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "coturn", "source": "cna", "vendor": "coturn"}, "product": "coturn", "vendor": "coturn"}], "created": "2026-07-31T22:30:17.915862+00:00", "updated": "2026-07-31T22:30:17.915894+00:00", "vendors": ["coturn", "coturn$PRODUCT$coturn"]}