CVE-2019-1010083: The Pallets Project Flask before 1.0 is affected by: unexpected memory usage

Q: How do I fix CVE-2019-1010083?

flask: upgrade to 1.0. Exact commands for each OS are on this page.

Q: Is CVE-2019-1010083 being exploited?

CVE-2019-1010083 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-1010083 affect?

CVE-2019-1010083 affects flask. Severity is high (CVSS 7.5). The Pallets Project Flask before 1.0 is affected by: unexpected memory usage. The impact is: denial of service. The attack vector is: crafted encoded JSON data. The fixed version is: 1. NOTE: this may overlap CVE-2018-1000656.

Q: How urgent is CVE-2019-1010083?

Priority 51/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2019-1010083 is a high-severity flaw (CVSS 7.5) affecting flask. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Pallets Project Flask before 1.0 is affected by: unexpected memory usage. The impact is: denial of service. The attack vector is: crafted encoded JSON data. The fixed version is: 1. NOTE: this may overlap CVE-2018-1000656.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.8% (top 21%)
CISA exploited list	No
Published	2019-07-17
Last modified	2026-06-17

Publisher (CNA): DWF · Vendor: palletsprojects

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-07-17 14:15 UTCPublished CVE record published
2026-06-17 02:09 UTCUpdated Record last modified

palletsprojects flask UPGRADE

Affected: < 1.0

Fixed in: 1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy flask || rpm -q flask || flask --version

2. UPGRADE to 1.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade flask

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade flask

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-1010083?

flask: upgrade to 1.0. Exact commands for each OS are on this page.

Is CVE-2019-1010083 being exploited?

CVE-2019-1010083 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-1010083 affect?

CVE-2019-1010083 affects flask. Severity is high (CVSS 7.5). The Pallets Project Flask before 1.0 is affected by: unexpected memory usage. The impact is: denial of service. The attack vector is: crafted encoded JSON data. The fixed version is: 1. NOTE: this may overlap CVE-2018-1000656.

How urgent is CVE-2019-1010083?

Priority 51/100. High severity; Remotely exploitable, no login, no user action

Software pages

Flask vulnerabilities

Related CVEs

CVE-2026-27205 MEDIUM 4.3 UPGRADE Flask is a web server gateway interface (WSGI) web application framework
CVE-2023-30861 HIGH 7.5 UPGRADE Flask is a lightweight WSGI web application framework
CVE-2018-1000656 HIGH 7.5 UPGRADE MITIGATE The Pallets Project flask version Before 0.12.3 contains a CWE-20: Improper Input Validation vulnerability in

References

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