{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-115319", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-10-22T10:11:36.987Z", "datePublished": "2026-10-22T10:57:40.288Z", "dateUpdated": "2026-10-22T10:57:40.288Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-10-22T10:57:40.288Z"}, "datePublic": "2026-10-21T00:00:00.000Z", "title": "fzf 0.36.0 through 0.74.5 Denial of Service via maskActionContents", "descriptions": [{"lang": "en", "value": "fzf 0.36.0 through 0.74.5 contains an inefficient algorithmic complexity vulnerability in maskActionContents that allows local attackers to exhaust the --listen HTTP server through quadratic string concatenation. Attackers can repeatedly send POST bodies of about 1 MB to the unauthenticated localhost port, blocking the single-threaded server for about 30 seconds each time."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "Inefficient Algorithmic Complexity", "cweId": "CWE-407", "type": "CWE"}]}], "affected": [{"vendor": "junegunn", "product": "fzf", "defaultStatus": "unaffected", "packageURL": "pkg:golang/github.com/junegunn/fzf", "versions": [{"version": "0.36.0", "lessThanOrEqual": "0.74.5", "status": "affected", "versionType": "semver"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:junegunn:fzf:*:*:*:*:*:*:*:*", "versionStartIncluding": "0.36.0", "versionEndIncluding": "0.74.5"}]}]}], "metrics": [{"format": "CVSS", "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 2, "baseSeverity": "LOW"}}, {"format": "CVSS", "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW", "baseScore": 2.5, "baseSeverity": "LOW"}}], "references": [{"url": "https://github.com/junegunn/fzf/commit/b412a450538e5f4a1d7057732e75d945dafa18a6", "tags": ["patch"], "name": "Patch Commit"}, {"url": "https://github.com/junegunn/fzf/blob/v0.74.5/src/options.go#L1680-L1736", "tags": ["technical-description"]}, {"url": "https://github.com/junegunn/fzf", "tags": ["product"]}, {"name": "VulnCheck Advisory: fzf 0.36.0 through 0.74.5 Denial of Service via maskActionContents", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/fzf-0.36.0-through-0.74.5-denial-of-service-via-maskactioncontents"}], "credits": [{"lang": "en", "value": "Zachariah Mithani (AploSec)", "type": "finder"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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{"bugzilla": {"description": "github.com/junegunn/fzf: fzf: Denial of Service via inefficient string concatenation", "id": "2558887", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2558887"}, "csaw": false, "cvss3": {"cvss3_base_score": "2.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-1046", "details": ["fzf 0.36.0 through 0.74.5 contains an inefficient algorithmic complexity vulnerability in maskActionContents that allows local attackers to exhaust the --listen HTTP server through quadratic string concatenation. Attackers can repeatedly send POST bodies of about 1 MB to the unauthenticated localhost port, blocking the single-threaded server for about 30 seconds each time.", "A flaw was found in fzf. Inefficient string concatenation in the maskActionContents function allows a local attacker to cause a Denial of Service (DoS). By repeatedly sending large HTTP requests to the local server, an attacker can block the single-threaded process and exhaust processing resources, rendering the service unresponsive."], "mitigation": {"lang": "en:us", "value": "Do not run fzf with the --listen option. The vulnerable code path is only reachable through the local HTTP server it starts. Without --listen, fzf does not accept the POST requests that trigger the quadratic string concatenation."}, "name": "CVE-2026-115319", "public_date": "2026-10-22T10:57:40Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-115319\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-115319\nhttps://github.com/junegunn/fzf\nhttps://github.com/junegunn/fzf/blob/v0.74.5/src/options.go#L1680-L1736\nhttps://github.com/junegunn/fzf/commit/b412a450538e5f4a1d7057732e75d945dafa18a6\nhttps://www.vulncheck.com/advisories/fzf-0.36.0-through-0.74.5-denial-of-service-via-maskactioncontents"], "statement": "Red Hat rates the impact of this flaw as Low because exploitation requires a local attacker and fzf to be running with the non-default --listen option, which exposes an unauthenticated server on localhost. Even then, the impact is limited to temporarily blocking the single-threaded fzf process; there is no impact on confidentiality or integrity. All shipped versions of fzf (Fedora, EPEL 9, and the copy vendored as a Go dependency in ocm-container) are within the affected range 0.36.0 through 0.74.5. The upstream fix is commit b412a450, which is not yet part of a released fzf version.", "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.36.0,0.74.5]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "fzf", "source": "cna", "vendor": "junegunn"}, "product": "fzf", "vendor": "junegunn"}], "created": "2026-10-22T13:15:06.125894+00:00", "updated": "2026-10-24T02:15:17.494744+00:00", "vendors": ["junegunn", "junegunn$PRODUCT$fzf"]}