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🐍
🐍 PyPI
Not in CISA KEV
HIGH severity

CVE-2019-14853 — ecdsa

HIGH

CVE-2019-14853 is a high-severity (CVSS 7.5) CWE-391 vulnerability in ecdsa. A fix is available for ecdsa — see the affected versions and patch details below.

Duplicate Advisory: possible DoS caused by malformed signature decoding in Pure-Python ECDSA

Also known asGHSA-2mrj-435v-c2crGHSA-pwfw-mgfj-7g3gPYSEC-2019-177
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs84th percentile — riskier than 84% of all scored CVEsHighest risk
0.00%1.08%2.16%3.24%0.1%2.4%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐍ecdsa

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

An error-handling flaw was found in python-ecdsa before version 0.13.3. During signature decoding, malformed DER signatures could raise unexpected exceptions (or no exceptions at all), which could lead to a denial of service.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIecdsaall versions0.13.3pip install --upgrade 'ecdsa==0.13.3'

Affected Products

1 product · 1 configurations
Application
python-ecdsapython-ecdsa_project
< 0.13.3
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for ecdsa, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update ecdsa to 0.13.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-14853 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatLow

Although Red Hat OpenStack Platform ships the flawed code, RHOSP does not actually use python-ecdsa's functionality. As such, Red Hat OpenStack Platform will not be providing a fix for python-ecdsa at this time. Current releases of Red Hat Virtualization Manager no longer includes python-ecdsa as a dependency. While…

ProductFixed inAdvisory
Red Hat Satellite 6.10 for RHEL 7python-ecdsa-0:0.13.3-2.el7pcRHSA-2021:4702

Frequently Asked Questions

An error-handling flaw was found in python-ecdsa before version 0.13.3. During signature decoding, malformed DER signatures could raise unexpected exceptions (or no exceptions at all), which could lead to a denial of service.
O3 Security · Impact-Aware SCA

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CVE-2019-14853: ecdsa DoS — Fixed in 0.13.3