{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-73564","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-08-12T20:53:46.380Z","datePublished":"2026-08-13T17:35:46.762Z","dateUpdated":"2026-08-13T17:53:06.534Z"},"containers":{"cna":{"title":"frp: Unauthenticated Remote Denial of Service in the frp SSH Tunnel Gateway via Integer Overflow","problemTypes":[{"descriptions":[{"cweId":"CWE-129","lang":"en","description":"CWE-129: Improper Validation of Array Index","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-190","lang":"en","description":"CWE-190: Integer Overflow or Wraparound","type":"CWE"}]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"}}],"references":[{"name":"https://github.com/fatedier/frp/security/advisories/GHSA-26gq-p25f-99cp","tags":["x_refsource_CONFIRM"],"url":"https://github.com/fatedier/frp/security/advisories/GHSA-26gq-p25f-99cp"},{"name":"https://github.com/fatedier/frp/pull/5428","tags":["x_refsource_MISC"],"url":"https://github.com/fatedier/frp/pull/5428"},{"name":"https://github.com/fatedier/frp/commit/7dc7be930e2452ae93fd32f2a77f8c6fcd0b652b","tags":["x_refsource_MISC"],"url":"https://github.com/fatedier/frp/commit/7dc7be930e2452ae93fd32f2a77f8c6fcd0b652b"},{"name":"https://github.com/fatedier/frp/releases/tag/v0.70.1","tags":["x_refsource_MISC"],"url":"https://github.com/fatedier/frp/releases/tag/v0.70.1"}],"affected":[{"vendor":"fatedier","product":"frp","versions":[{"version":">= 0.53.0, < 0.70.1","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-08-13T17:35:46.762Z"},"descriptions":[{"lang":"en","value":"frp is a fast reverse proxy. From 0.53.0 until 0.70.1, frp's optional SSH Tunnel Gateway in pkg/ssh/server.go parses an SSH exec channel request by adding 4 to an attacker-controlled four-byte big-endian length. A length of 0xFFFFFFFF makes the uint32 addition wrap to 3, defeats the payload bounds check, and causes payload[4:3] to panic in TunnelServer.handleNewChannel. When no authorized-keys file is configured, sshConfig.NoClientAuth permits an unauthenticated peer to reach this channel phase before the frp token is checked, so a single five-byte request terminates the frps process and drops every active tunnel. This issue is fixed in version 0.70.1."}],"source":{"advisory":"GHSA-26gq-p25f-99cp","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/fatedier/frp/security/advisories/GHSA-26gq-p25f-99cp","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-13T17:52:30.634352Z","id":"CVE-2026-73564","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":"2026-08-13T17:53:06.534Z"}}]}}