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The Pallets Project flask version Before 0.12.3 contains a CWE-20: Improper Input Validation vulnerability in flask that can result in Large amount of memory usage possibly leading to denial of service. This attack appear to be exploitable via Attacker provides JSON data in incorrect encoding. This vulnerability appears to have been fixed in 0.12.3. NOTE: this may overlap CVE-2019-1010083.
Cite this page
CVE-2018-1000656. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2018-1000656
Use CWE-20, Palletsprojects vendor hub and Flask product page to widen CVE-2018-1000656 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2023-30861, CVE-2019-1010083 and CVE-2026-27205 for nearby disclosures in the same product family.