CVE-2018-1000656
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.85%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 3.85% probability · 90th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- palletsprojects/flask · netapp/active iq · netapp/hyper converged infrastructure · netapp/ontap select deploy utility
- Source
- cve@mitre.org
EPSS 3.9% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/pallets/flask/pull/2691Issue Tracking, Patch, Third Party Advisory
- https://github.com/pallets/flask/releases/tag/0.12.3Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/08/msg00025.html
- https://security.netapp.com/advisory/ntap-20190221-0001/Patch, Third Party Advisory
- https://usn.ubuntu.com/4378-1/
- https://github.com/pallets/flask/pull/2691Issue Tracking, Patch, Third Party Advisory
- https://github.com/pallets/flask/releases/tag/0.12.3Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/08/msg00025.html
- https://security.netapp.com/advisory/ntap-20190221-0001/Patch, Third Party Advisory
- https://usn.ubuntu.com/4378-1/
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.