{"id":"CVE-2026-6409","state":"PUBLISHED","title":"Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input","description":"A Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input. Maliciously structured messages—specifically those containing negative varints or deep recursion—can be used to crash the application, impacting service availability.","publishedAt":"2026-04-16T14:30:51.568Z","updatedAt":"2026-04-16T15:24:43.164Z","severity":{"score":7.1,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"Google"},"assigner":"Google","products":["Protocol Buffers Protobuf-php (Pecl)"],"affected":[{"vendor":"Protocol Buffers","product":"Protobuf-php (Pecl)","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"5.34.0-RC1","versionType":"semver"},{"version":"0","status":"affected","lessThan":"4.33.6","versionType":"semver"}]}],"references":["https://github.com/protocolbuffers/protobuf/security/advisories/GHSA-p2gh-cfq4-4wjc"],"weaknesses":["CWE-20"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/6xxx/CVE-2026-6409.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-6409","state":"PUBLISHED","datePublished":"2026-04-16T14:30:51.568Z","dateUpdated":"2026-04-16T15:24:43.164Z","assignerShortName":"Google","assignerOrgId":"14ed7db2-1595-443d-9d34-6215bf890778","dateReserved":"2026-04-15T21:56:37.963Z"},"containers":{"cna":{"title":"Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input","descriptions":[{"lang":"en","value":"A Denial of Service (DoS) vulnerability exists in the Protobuf PHP library during the parsing of untrusted input. Maliciously structured messages—specifically those containing negative varints or deep recursion—can be used to crash the application, impacting service availability."}],"affected":[{"vendor":"Protocol Buffers","product":"Protobuf-php (Pecl)","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"5.34.0-RC1","versionType":"semver"},{"version":"0","status":"affected","lessThan":"4.33.6","versionType":"semver"}]}],"references":[{"url":"https://github.com/protocolbuffers/protobuf/security/advisories/GHSA-p2gh-cfq4-4wjc"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":7.1,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-20","lang":"en","description":"CWE-20 Improper input validation","type":"CWE"}]}],"providerMetadata":{"shortName":"Google","orgId":"14ed7db2-1595-443d-9d34-6215bf890778","dateUpdated":"2026-04-16T14:30:51.568Z"},"impacts":[{"capecId":"CAPEC-130","descriptions":[{"lang":"en","value":"CAPEC-130 Excessive Allocation"}]}],"credits":[{"lang":"en","value":"https://github.com/34selen","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.1"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-16T15:23:55.455444Z","id":"CVE-2026-6409","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-16T15:24:43.164Z"}}]}}}