CVE catalog
CVE-2018-1000656
flask: CVE-2018-1000656
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 3.85% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | flask | sid | 3.1.3-4 | fixed |
| Debian | flask | forky | 3.1.3-4 | fixed |
| Debian | flask | trixie | 3.1.1-1+deb13u1 | fixed |
| Debian | flask | bookworm | 2.2.2-3 | fixed |
| Ubuntu | flask | pro | 0.10.1-2 | vulnerable |
| Ubuntu | flask | pro | 0.10.1-2build1 | vulnerable |
| Ubuntu | flask | pro | 0.10.1-2ubuntu0.1~esm1 | fixed |
| Ubuntu | flask | 16.04 | 0.10.1-2build2 | vulnerable |
| Ubuntu | flask | 16.04 | 0.10.1-2ubuntu0.1 | fixed |
| Ubuntu | flask | 18.04 | 0.12.2-2 | vulnerable |
| Ubuntu | flask | 18.04 | 0.12.2-3 | vulnerable |
| Ubuntu | flask | 18.04 | 0.12.2-3ubuntu0.1 | fixed |
| Opensuse | python-Flask | leap 15.0 | 0.12.4-lp150.2.3.1 | fixed |
| Ubuntu | flask | pro | 0.10.1-2 | vulnerable |
| Ubuntu | flask | pro | 0.10.1-2build1 | vulnerable |
| Ubuntu | flask | pro | 0.10.1-2ubuntu0.1~esm1 | fixed |
| Ubuntu | flask | 16.04 | 0.10.1-2build2 | vulnerable |
| Ubuntu | flask | 16.04 | 0.10.1-2ubuntu0.1 | fixed |
| Ubuntu | flask | 18.04 | 0.12.2-2 | vulnerable |
| Ubuntu | flask | 18.04 | 0.12.2-3 | vulnerable |
| Ubuntu | flask | 18.04 | 0.12.2-3ubuntu0.1 | fixed |
| Suse | python-Flask | linux enterprise module for basesystem 15 | 0.12.4-3.3.26 | fixed |
| Suse | python-Flask | linux enterprise module for package hub 15 | 0.12.4-3.3.26 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | flask | source | sid | 1.0.2-1 | not yet assigned | Not reported | Not reported |
| Debian | flask | source | forky | 1.0.2-1 | not yet assigned | Not reported | Not reported |
| Debian | flask | source | trixie | 1.0.2-1 | not yet assigned | Not reported | Not reported |
| Debian | flask | source | bookworm | 1.0.2-1 | not yet assigned | Not reported | Not reported |
| Ubuntu | flask | deb | pro | 0.10.1-2ubuntu0.1~esm1 | Not reported | USN-4378-1 | Not reported |
| Ubuntu | flask | deb | 16.04 | 0.10.1-2ubuntu0.1 | Not reported | USN-4378-1 | Not reported |
| Ubuntu | flask | deb | 18.04 | 0.12.2-3ubuntu0.1 | Not reported | USN-4378-1 | Not reported |
| Opensuse | python-Flask | rpm | leap 15.0 | 0.12.4-lp150.2.3.1 | Not reported | OPENSUSE-SU-2019:1112-1 | Not reported |
| Ubuntu | flask | deb | pro | 0.10.1-2ubuntu0.1~esm1 | Not reported | UBUNTU-CVE-2018-1000656 | Not reported |
| Ubuntu | flask | deb | 16.04 | 0.10.1-2ubuntu0.1 | Not reported | UBUNTU-CVE-2018-1000656 | Not reported |
| Ubuntu | flask | deb | 18.04 | 0.12.2-3ubuntu0.1 | Not reported | UBUNTU-CVE-2018-1000656 | Not reported |
| Suse | python-Flask | rpm | linux enterprise module for basesystem 15 | 0.12.4-3.3.26 | Not reported | SUSE-SU-2019:0657-1 | Not reported |
| Suse | python-Flask | rpm | linux enterprise module for package hub 15 | 0.12.4-3.3.26 | Not reported | SUSE-SU-2019:0657-1 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-flask]Fixed
Source package: [flask]
Details (2)
2.2.2-3· all · bookwormFixed · Fixed:
1.0.2-1dsa · flask · debian · bookworm; dsa · flask · debian · 12
2.2.2-3· all · bookwormFixed · Fixed:
1.0.2-1dsa · flask · debian · bookworm; dsa · flask · debian · 12
- [python-flask-doc]Fixed
Source package: [flask]
Details (2)
2.2.2-3· all · bookwormFixed · Fixed:
1.0.2-1dsa · flask · debian · bookworm; dsa · flask · debian · 12
2.2.2-3· all · bookwormFixed · Fixed:
1.0.2-1dsa · flask · debian · bookworm; dsa · flask · debian · 12
[Debian 13 (Trixie)]
- [python3-flask]Fixed
Source package: [flask]
Details (2)
3.1.1-1· all · trixieFixed · Fixed:
1.0.2-1dsa · flask · debian · 13
3.1.1-1· all · trixieFixed · Fixed:
1.0.2-1dsa · flask · debian · 13
- [python-flask-doc]Fixed
Source package: [flask]
Details (2)
3.1.1-1· all · trixieFixed · Fixed:
1.0.2-1dsa · flask · debian · 13
3.1.1-1· all · trixieFixed · Fixed:
1.0.2-1dsa · flask · debian · 13
Observed:
References
- [https://access.redhat.com/errata/RHSA-2020:0870]
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2019_0657-1.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2018-1000656]
- [https://osv.dev/vulnerability/DLA-1892-1]
- [https://osv.dev/vulnerability/SUSE-SU-2019:0657-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2018-1000656]
- [https://osv.dev/vulnerability/USN-4378-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2019:1112-1]
- [https://security-tracker.debian.org/tracker/CVE-2018-1000656]
[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]