CVE Explorer
CVE-2026-53433
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.
This issue wa
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","product":"fzf","programFiles":["src/server.go"],"repo":"https://github.com/junegunn/fzf","vendor":"fzf","versions":[{"lessThan":"0.73.1","status":"affected","version":"0","versionType":"semver"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:3c2a55c76a3828e42690977eb569c7c2d0a74bacdf7ddd04addc5fa9aeb5a962 · sha256:15096ea15807763e… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"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":"N…
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:3c2a55c76a3828e42690977eb569c7c2d0a74bacdf7ddd04addc5fa9aeb5a962 · sha256:15096ea15807763e… · /containers/cna/metrics/0/cvssV4_0
CWE assertions
1 source assertion{"cweId":"CWE-407","description":"CWE-407 Inefficient Algorithmic Complexity","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:3c2a55c76a3828e42690977eb569c7c2d0a74bacdf7ddd04addc5fa9aeb5a962 · sha256:15096ea15807763e… · /containers/cna/problemTypes/0/descriptions/0
Source references
3 source assertions{"tags":["third-party-advisory"],"url":"https://cert.pl/en/posts/2026/06/CVE-2026-53432"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3c2a55c76a3828e42690977eb569c7c2d0a74bacdf7ddd04addc5fa9aeb5a962 · sha256:15096ea15807763e… · /containers/cna/references/0
{"tags":["product"],"url":"https://github.com/junegunn/fzf"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3c2a55c76a3828e42690977eb569c7c2d0a74bacdf7ddd04addc5fa9aeb5a962 · sha256:15096ea15807763e… · /containers/cna/references/1
{"tags":["issue-tracking"],"url":"https://github.com/junegunn/fzf/commit/7963a2c6586c0b9eaa89b8995de8f0e08cf8a4ce"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:3c2a55c76a3828e42690977eb569c7c2d0a74bacdf7ddd04addc5fa9aeb5a962 · sha256:15096ea15807763e… · /containers/cna/references/2
Attribution and limitations
- CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →
Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.