{"id":"CVE-2026-53433","state":"PUBLISHED","title":"Denial of Service in fzf","description":"fzf is vulnerable to a Denial of Service (DoS) due to inefficient HTTP body processing in the --listen mode due to inefficient HTTP body processing using repeated string concatenation, resulting in quadratic time complexity (O(n²)). A crafted POST request with many small segments can trigger excessive CPU usage during request handling.This allows a single malicious request to monopolize the single‑threaded HTTP server, blocking all other clients and resulting in denial of service.\n\nThis issue was fixed in version 0.73.1.","publishedAt":"2026-06-30T12:01:14.407Z","updatedAt":"2026-06-30T13:32:52.251Z","severity":{"score":5.7,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"CERT-PL"},"assigner":"CERT-PL","products":["fzf fzf"],"affected":[{"vendor":"fzf","product":"fzf","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.73.1","versionType":"semver"}],"programFiles":["src/server.go"],"repo":"https://github.com/junegunn/fzf"}],"references":["https://cert.pl/en/posts/2026/06/CVE-2026-53432","https://github.com/junegunn/fzf","https://github.com/junegunn/fzf/commit/7963a2c6586c0b9eaa89b8995de8f0e08cf8a4ce"],"weaknesses":["CWE-407"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53433.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53433","state":"PUBLISHED","datePublished":"2026-06-30T12:01:14.407Z","dateUpdated":"2026-06-30T13:32:52.251Z","assignerShortName":"CERT-PL","assignerOrgId":"4bb8329e-dd38-46c1-aafb-9bf32bcb93c6","dateReserved":"2026-06-09T11:41:37.126Z"},"containers":{"cna":{"title":"Denial of Service in fzf","descriptions":[{"lang":"en","value":"fzf is vulnerable to a Denial of Service (DoS) due to inefficient HTTP body processing in the --listen mode due to inefficient HTTP body processing using repeated string concatenation, resulting in quadratic time complexity (O(n²)). A crafted POST request with many small segments can trigger excessive CPU usage during request handling.This allows a single malicious request to monopolize the single‑threaded HTTP server, blocking all other clients and resulting in denial of service.\n\nThis issue was fixed in version 0.73.1."}],"affected":[{"vendor":"fzf","product":"fzf","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.73.1","versionType":"semver"}],"programFiles":["src/server.go"],"repo":"https://github.com/junegunn/fzf"}],"references":[{"url":"https://cert.pl/en/posts/2026/06/CVE-2026-53432","tags":["third-party-advisory"]},{"url":"https://github.com/junegunn/fzf","tags":["product"]},{"url":"https://github.com/junegunn/fzf/commit/7963a2c6586c0b9eaa89b8995de8f0e08cf8a4ce","tags":["issue-tracking"]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"LOCAL","baseScore":5.7,"baseSeverity":"MEDIUM","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-407","description":"CWE-407 Inefficient Algorithmic Complexity","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"CERT-PL","orgId":"4bb8329e-dd38-46c1-aafb-9bf32bcb93c6","dateUpdated":"2026-06-30T12:01:14.407Z"},"credits":[{"lang":"en","type":"finder","value":"Michał Majchrowicz (AFINE Team)"},{"lang":"en","type":"finder","value":"Marcin Wyczechowski (AFINE Team)"}],"datePublic":"2026-06-30T12:01:00.000Z","source":{"discovery":"EXTERNAL"},"tags":["x_open-source"],"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-30T13:32:32.210950Z","id":"CVE-2026-53433","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":"2026-06-30T13:32:52.251Z"}}]}}}