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Fencer Vulns
high 7.4

CVE-2019-14859 json

Improper Verification of Cryptographic Signature in Pure-Python ECDSA

published 2020-01-02 6 y ago modified 2026-06-17 4 mo ago also GHSA-8qxj-f9rh-9fg2 , PYSEC-2020-163 , EUVD-2020-0076

cvss
7.4
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits
0
none known

Summary

A flaw was found in all python-ecdsa versions before 0.13.3, where it did not correctly verify whether signatures used DER encoding. Without this verification, a malformed signature could be accepted, making the signature malleable. Without proper verification, an attacker could use a malleable signature to create false transactions.

Patch / fix

  • pypi ecdsa 0.13.3
  • python-ecdsa_project python-ecdsa 0.13.3
  • python-ecdsa Debian 14, Debian 13, Debian 12 0.13.3-1

debian advisories DEBIAN-CVE-2019-14859

  • python-ecdsa Ubuntu 16.04 LTS 0.13-2ubuntu0.16.04.1
  • python-ecdsa Ubuntu 18.04 LTS 0.13-2ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2019-14859

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • foreman satellite capsule 6.10, satellite 6.10 2.5.2.17-2.el7sat
  • candlepin satellite 6.10 4.0.9-1.el7sat
  • satellite satellite capsule 6.10, satellite 6.10 6.10.0-3.el7sat
  • python-ecdsa satellite capsule 6.10, satellite 6.10 0.13.3-2.el7pc
  • python-pyyaml satellite capsule 6.10, satellite 6.10 5.4.1-1.el7pc
  • python3-ecdsa satellite capsule 6.10, satellite 6.10 0.13.3-2.el7pc
  • python-aiohttp satellite capsule 6.10, satellite 6.10 3.7.4-1.el7pc
  • python-urllib3 satellite capsule 6.10, satellite 6.10 1.26.5-1.el7pc

red hat advisories RHSA-2021:4702

  • python-ecdsa SLE Module for Public Cloud 15, SLE Module for Package Hub 15 SP2, SLE Module for Package Hub 15 SP1 +3 more 0.13.3-3.3.1
  • python-ecdsa SLE Module for Public Cloud 12, OpenStack Cloud Crowbar 9, OpenStack Cloud Crowbar 8 +5 more 0.13.3-5.10.1

suse advisories SUSE-SU-2019:2891-2SUSE-SU-2019:3024-1SUSE-SU-2019:2891-1

  • python-ecdsa openSUSE Tumbleweed 0.19.2-2.2
  • python-ecdsa openSUSE Tumbleweed 0.16.1-1.5
  • python-ecdsa openSUSE Tumbleweed 0.19.0-1.1
  • python-ecdsa openSUSE Leap 15.1 0.13.3-lp151.3.3.1
  • python-ecdsa openSUSE Leap 15.0 0.13.3-lp150.2.3.1

opensuse advisories openSUSE-SU-2026:12008-1openSUSE-SU-2024:11229-1openSUSE-SU-2024:13862-1openSUSE-SU-2019:2474-1openSUSE-SU-2019:2472-1

  • py3-ecdsa Alpine 3.24, Alpine 3.23, Alpine 3.22 +11 more 0.13.3-r0

alpine advisories ALPINE-CVE-2019-14859

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-14859 updated cvss 7.4

python-ecdsa: DER encoding is not being verified in signatures

  • Red Hat Ceph Storage 2 python-ecdsa Red Hat OpenStack Platform 10 (Newton) python-ecdsa Red Hat OpenStack Platform 13 (Queens) python-ecdsa Red Hat OpenStack Platform 14 (Rocky) python-ecdsa Red Hat OpenStack Platform 15 (Stein) python3-ecdsa
    affected: no fix planned “Will not fix”
  • Red Hat Storage 3 python-ecdsa
    affected: no fix available “Fix deferred”
  • Red Hat Virtualization 4 python-ecdsa
    affected: no fix planned “Will not fix”
  • Red Hat Satellite 6.10 python-ecdsa 0.13.3-2.el7pc, python3-ecdsa 0.13.3-2.el7pc Red Hat Satellite Capsule 6.10 python-ecdsa 0.13.3-2.el7pc, python3-ecdsa 0.13.3-2.el7pc
    fixed: vendor fix RHSA-2021:4702
  • Red Hat CloudForms Management Engine 5 python-ecdsa Red Hat Satellite 6.10 tfm 7.0-1.el7sat, gofer 2.12.5-7.el7sat, katello 4.1.1-2.el7sat, libsolv 0.7.20-1.el7pc, receptor 0.6.4-2.el7ar, libcomps 0.1.15-1.el7pc, +580 more Red Hat Satellite Capsule 6.10 tfm 7.0-1.el7sat, katello 4.1.1-2.el7sat, libsolv 0.7.20-1.el7pc, libcomps 0.1.15-1.el7pc, python-rq 1.8.1-1.el7pc, python-idna 2.10-1.el7pc, +353 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.53% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14859 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/warner/python-ecdsa/issues/114 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 7.4 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:P/A:N
GitHub 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
pypi ecdsa
<0.13.3
0.13.3

Affected products

  • Red Hat python-ecdsa

Classification

Weakness
  • CWE-347 Improper Verification of Cryptographic Signature

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.