{"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→unsigned 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"}}]}}