CVE-2026-115319

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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"}

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