Every CVE Search/ Get API key

CVE-2019-14859

Improper Verification of Cryptographic Signature in Pure-Python ECDSA

7.4 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
None

Exploit likelihood

1.53%Up 0.5 points since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List Score used 7.4

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.

Record
CVE-2019-14859
CVSS 3.0
7.4 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-347
Updated
2026-11-02
EUVDEUVD-2020-0076 7.4

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.

Record
EUVD-2020-0076
CVSS 3.0
7.4 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-8qxj-f9rh-9fg2 9.3

Improper Verification of Cryptographic Signature in Pure-Python ECDSA

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.

Record
GHSA-8qxj-f9rh-9fg2
CVSS 4.0
9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-347
Updated
2026-11-02
NVD 9.1

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.

Record
CVE-2019-14859
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS 3.0
7.4 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS 2.0
6.4 MediumAV:N/AC:L/Au:N/C:P/I:P/A:N
Weakness
CWE-347
Updated
2026-11-02
OSVALPINE-CVE-2019-14859 9.1

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.

Record
ALPINE-CVE-2019-14859
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-03
OSV 9.1

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.

Record
CVE-2019-14859
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
Show 15 moreShow less
OSVDEBIAN-CVE-2019-14859 9.1

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.

Record
DEBIAN-CVE-2019-14859
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
OSVGHSA-8qxj-f9rh-9fg2 9.3

Improper Verification of Cryptographic Signature in Pure-Python ECDSA

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.

Record
GHSA-8qxj-f9rh-9fg2
CVSS 4.0
9.3 CriticalCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-347
Updated
2026-11-02
OSVRHSA-2021:4702 9.8

Red Hat Security Advisory: Satellite 6.10 Release

Record
RHSA-2021:4702
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2019-14859 9.1

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.

Record
UBUNTU-CVE-2019-14859
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS 3.0
7.4 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
OSVMGASA-2020-0002 No score

Updated python-ecdsa packages fix security vulnerabilities

Updated python-ecdsa packages fix security vulnerabilities:

It was discovered that python-ecdsa incorrectly handled certain signatures. A remote attacker could possibly use this issue to cause python-ecdsa to generate unexpected exceptions, resulting in a denial of service (CVE-2019-14853).

It was discovered that python-ecdsa incorrectly verified DER encoding in signatures. A remote attacker could use this issue to perform certain malleability attacks (CVE-2019-14859).

Record
MGASA-2020-0002
Updated
2026-11-02
OSVopenSUSE-SU-2019:2472-1 No score

Security update for python-ecdsa

This update for python-ecdsa to version 0.13.3 fixes the following issues:

Security issues fixed:

  • CVE-2019-14853: Fixed unexpected exceptions during signature decoding (bsc#1153165).
  • CVE-2019-14859: Fixed a signature malleability caused by insufficient checks of DER encoding (bsc#1154217).

This update was imported from the SUSE:SLE-15:Update update project.

Record
openSUSE-SU-2019:2472-1
Updated
2026-11-02
OSVopenSUSE-SU-2019:2474-1 No score

Security update for python-ecdsa

This update for python-ecdsa to version 0.13.3 fixes the following issues:

Security issues fixed:

  • CVE-2019-14853: Fixed unexpected exceptions during signature decoding (bsc#1153165).
  • CVE-2019-14859: Fixed a signature malleability caused by insufficient checks of DER encoding (bsc#1154217).

This update was imported from the SUSE:SLE-15:Update update project.

Record
openSUSE-SU-2019:2474-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11229-1 No score

python36-ecdsa-0.16.1-1.5 on GA media

These are all security issues fixed in the python36-ecdsa-0.16.1-1.5 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11229-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:13862-1 No score

python310-ecdsa-0.19.0-1.1 on GA media

These are all security issues fixed in the python310-ecdsa-0.19.0-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:13862-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:12008-1 No score

python313-ecdsa-0.19.2-2.2 on GA media

These are all security issues fixed in the python313-ecdsa-0.19.2-2.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:12008-1
Updated
2026-11-02
OSVPYSEC-2020-163 No score

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.

Record
PYSEC-2020-163
Updated
2026-11-02
OSVSUSE-SU-2019:2891-1 No score

Security update for python-ecdsa

This update for python-ecdsa to version 0.13.3 fixes the following issues:

Security issues fixed:

  • CVE-2019-14853: Fixed unexpected exceptions during signature decoding (bsc#1153165).
  • CVE-2019-14859: Fixed a signature malleability caused by insufficient checks of DER encoding (bsc#1154217).
Record
SUSE-SU-2019:2891-1
Updated
2026-11-02
OSVSUSE-SU-2019:2891-2 No score

Security update for python-ecdsa

This update for python-ecdsa to version 0.13.3 fixes the following issues:

Security issues fixed:

  • CVE-2019-14853: Fixed unexpected exceptions during signature decoding (bsc#1153165).
  • CVE-2019-14859: Fixed a signature malleability caused by insufficient checks of DER encoding (bsc#1154217).
Record
SUSE-SU-2019:2891-2
Updated
2026-11-02
OSVSUSE-SU-2019:3024-1 No score

Security update for python-ecdsa

This update for python-ecdsa to version 0.13.3 fixes the following issues:

Security issues fixed:

  • CVE-2019-14853: Fixed unexpected exceptions during signature decoding (bsc#1153165).
  • CVE-2019-14859: Fixed a signature malleability caused by insufficient checks of DER encoding (bsc#1154217).
Record
SUSE-SU-2019:3024-1
Updated
2026-11-02
OSVUSN-4196-1 No score

python-ecdsa vulnerabilities

It was discovered that python-ecdsa incorrectly handled certain signatures. A remote attacker could possibly use this issue to cause python-ecdsa to generate unexpected exceptions, resulting in a denial of service. (CVE-2019-14853)

It was discovered that python-ecdsa incorrectly verified DER encoding in signatures. A remote attacker could use this issue to perform certain malleability attacks. (CVE-2019-14859)

Record
USN-4196-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
ecdsa
PyPI
 before 0.13.3
0.13.3
py3-ecdsa
Alpine:v3.11
 before 0.13.3-r0
0.13.3-r0
py3-ecdsa
Alpine:v3.12
 before 0.13.3-r0
0.13.3-r0
py3-ecdsa
Alpine:v3.13
 before 0.13.3-r0
0.13.3-r0
py3-ecdsa
Alpine:v3.14
 before 0.13.3-r0
0.13.3-r0
py3-ecdsa
Alpine:v3.15
 before 0.13.3-r0
0.13.3-r0
py3-ecdsa
Alpine:v3.16
 before 0.13.3-r0
0.13.3-r0
py3-ecdsa
Alpine:v3.17
 before 0.13.3-r0
0.13.3-r0
py3-ecdsa
Alpine:v3.18
 before 0.13.3-r0
0.13.3-r0
py3-ecdsa
Alpine:v3.19
 before 0.13.3-r0
0.13.3-r0
Show 66 moreShow less
Affected packages
PackageAffectedFixed
py3-ecdsa
Alpine:v3.20
 before 0.13.3-r0
0.13.3-r0
py3-ecdsa
Alpine:v3.21
 before 0.13.3-r0
0.13.3-r0
py3-ecdsa
Alpine:v3.22
 before 0.13.3-r0
0.13.3-r0
py3-ecdsa
Alpine:v3.23
 before 0.13.3-r0
0.13.3-r0
py3-ecdsa
Alpine:v3.24
 before 0.13.3-r0
0.13.3-r0
python-ecdsa
Debian:12
 before 0.13.3-1
0.13.3-1
python-ecdsa
Debian:13
 before 0.13.3-1
0.13.3-1
python-ecdsa
Debian:14
 before 0.13.3-1
0.13.3-1
python-ecdsa
Debian:8
From an advisory covering 2 CVEs
 before 0.11-1+deb8u1, plus listed versions
0.11-1
0.11-1+deb8u1
python-ecdsa
Debian:9
From an advisory covering 2 CVEs
 before 0.13-2+deb9u1, plus listed versions
0.13-2
0.13-2+deb9u1
python-ecdsa
Debian:10
From an advisory covering 2 CVEs
 before 0.13-3+deb10u1, plus listed versions
0.13-3
0.13-3+deb10u1
ecdsa
PyPI
 before 0.13.3, plus listed versions
0.100.110.120.130.13.1
Show 5 moreShow less
0.13.20.60.70.80.9
0.13.3
python-ecdsa
Mageia:7
From an advisory covering 2 CVEs
 before 0.13.3-1.mga7
0.13.3-1.mga7
ecdsa
PyPI
 before 0.13.3, plus listed versions
0.60.70.80.90.10
Show 5 moreShow less
0.110.120.130.13.10.13.2
0.13.3
python-ecdsa
Red Hat:satellite_capsule:6.10::el7
From an advisory covering 21 CVEs
 before 0:0.13.3-2.el7pc
0:0.13.3-2.el7pc
python3-ecdsa
Red Hat:satellite_capsule:6.10::el7
From an advisory covering 21 CVEs
 before 0:0.13.3-2.el7pc
0:0.13.3-2.el7pc
python-ecdsa
Red Hat:satellite:6.10::el7
From an advisory covering 21 CVEs
 before 0:0.13.3-2.el7pc
0:0.13.3-2.el7pc
python3-ecdsa
Red Hat:satellite:6.10::el7
From an advisory covering 21 CVEs
 before 0:0.13.3-2.el7pc
0:0.13.3-2.el7pc
tfm-rubygem-activerecord-session_store
Red Hat:satellite:6.10::el7
From an advisory covering 21 CVEs
 before 0:2.0.0-1.el7sat
0:2.0.0-1.el7sat
satellite
Red Hat:satellite_capsule:6.10::el7
From an advisory covering 21 CVEs
 before 0:6.10.0-3.el7sat
0:6.10.0-3.el7sat
satellite
Red Hat:satellite:6.10::el7
From an advisory covering 21 CVEs
 before 0:6.10.0-3.el7sat
0:6.10.0-3.el7sat
candlepin
Red Hat:satellite:6.10::el7
From an advisory covering 21 CVEs
 before 0:4.0.9-1.el7sat
0:4.0.9-1.el7sat
python-pyyaml
Red Hat:satellite_capsule:6.10::el7
From an advisory covering 21 CVEs
 before 0:5.4.1-1.el7pc
0:5.4.1-1.el7pc
python3-pyyaml
Red Hat:satellite_capsule:6.10::el7
From an advisory covering 21 CVEs
 before 0:5.4.1-1.el7pc
0:5.4.1-1.el7pc
python-pyyaml
Red Hat:satellite:6.10::el7
From an advisory covering 21 CVEs
 before 0:5.4.1-1.el7pc
0:5.4.1-1.el7pc
python3-pyyaml
Red Hat:satellite:6.10::el7
From an advisory covering 21 CVEs
 before 0:5.4.1-1.el7pc
0:5.4.1-1.el7pc
tfm-rubygem-nokogiri
Red Hat:satellite_capsule:6.10::el7
From an advisory covering 21 CVEs
 before 0:1.11.3-2.el7sat
0:1.11.3-2.el7sat
tfm-rubygem-nokogiri
Red Hat:satellite:6.10::el7
From an advisory covering 21 CVEs
 before 0:1.11.3-2.el7sat
0:1.11.3-2.el7sat
satellite-capsule
Red Hat:satellite_capsule:6.10::el7
From an advisory covering 21 CVEs
 before 0:6.10.0-3.el7sat
0:6.10.0-3.el7sat
foreman
Red Hat:satellite_capsule:6.10::el7
From an advisory covering 21 CVEs
 before 0:2.5.2.17-2.el7sat
0:2.5.2.17-2.el7sat
foreman
Red Hat:satellite:6.10::el7
From an advisory covering 21 CVEs
 before 0:2.5.2.17-2.el7sat
0:2.5.2.17-2.el7sat
python-aiohttp
Red Hat:satellite_capsule:6.10::el7
From an advisory covering 21 CVEs
 before 0:3.7.4-1.el7pc
0:3.7.4-1.el7pc
python-aiohttp
Red Hat:satellite:6.10::el7
From an advisory covering 21 CVEs
 before 0:3.7.4-1.el7pc
0:3.7.4-1.el7pc
tfm-rubygem-actionpack
Red Hat:satellite:6.10::el7
From an advisory covering 21 CVEs
 before 0:6.0.3.7-1.el7sat
0:6.0.3.7-1.el7sat
tfm-rubygem-rails
Red Hat:satellite:6.10::el7
From an advisory covering 21 CVEs
 before 0:6.0.3.7-1.el7sat
0:6.0.3.7-1.el7sat
python3-django
Red Hat:satellite_capsule:6.10::el7
From an advisory covering 21 CVEs
 before 0:2.2.24-1.el7pc
0:2.2.24-1.el7pc
python3-django
Red Hat:satellite:6.10::el7
From an advisory covering 21 CVEs
 before 0:2.2.24-1.el7pc
0:2.2.24-1.el7pc
tfm-rubygem-puma
Red Hat:satellite:6.10::el7
From an advisory covering 21 CVEs
 before 0:5.3.2-1.el7sat
0:5.3.2-1.el7sat
tfm-rubygem-addressable
Red Hat:satellite:6.10::el7
From an advisory covering 21 CVEs
 before 0:2.8.0-1.el7sat
0:2.8.0-1.el7sat
python-urllib3
Red Hat:satellite_capsule:6.10::el7
From an advisory covering 21 CVEs
 before 0:1.26.5-1.el7pc
0:1.26.5-1.el7pc
python3-urllib3
Red Hat:satellite_capsule:6.10::el7
From an advisory covering 21 CVEs
 before 0:1.26.5-1.el7pc
0:1.26.5-1.el7pc
python-urllib3
Red Hat:satellite:6.10::el7
From an advisory covering 21 CVEs
 before 0:1.26.5-1.el7pc
0:1.26.5-1.el7pc
python3-urllib3
Red Hat:satellite:6.10::el7
From an advisory covering 21 CVEs
 before 0:1.26.5-1.el7pc
0:1.26.5-1.el7pc
python-ecdsa
SUSE:Linux Enterprise Module for Basesystem 15 SP1
From an advisory covering 2 CVEs
 before 0.13.3-3.3.1
0.13.3-3.3.1
python-ecdsa
SUSE:Linux Enterprise Module for Package Hub 15
From an advisory covering 2 CVEs
 before 0.13.3-3.3.1
0.13.3-3.3.1
python-ecdsa
SUSE:Linux Enterprise Module for Public Cloud 15
From an advisory covering 2 CVEs
 before 0.13.3-3.3.1
0.13.3-3.3.1
python-ecdsa
SUSE:Linux Enterprise Module for Basesystem 15 SP2
From an advisory covering 2 CVEs
 before 0.13.3-3.3.1
0.13.3-3.3.1
python-ecdsa
SUSE:Linux Enterprise Module for Package Hub 15 SP1
From an advisory covering 2 CVEs
 before 0.13.3-3.3.1
0.13.3-3.3.1
python-ecdsa
SUSE:Linux Enterprise Module for Package Hub 15 SP2
From an advisory covering 2 CVEs
 before 0.13.3-3.3.1
0.13.3-3.3.1
python-ecdsa
SUSE:HPE Helion OpenStack 8
From an advisory covering 2 CVEs
 before 0.13.3-5.10.1
0.13.3-5.10.1
python-ecdsa
SUSE:OpenStack Cloud 7
From an advisory covering 2 CVEs
 before 0.13.3-5.10.1
0.13.3-5.10.1
python-ecdsa
SUSE:OpenStack Cloud 8
From an advisory covering 2 CVEs
 before 0.13.3-5.10.1
0.13.3-5.10.1
python-ecdsa
SUSE:OpenStack Cloud 9
From an advisory covering 2 CVEs
 before 0.13.3-5.10.1
0.13.3-5.10.1
python-ecdsa
SUSE:OpenStack Cloud Crowbar 8
From an advisory covering 2 CVEs
 before 0.13.3-5.10.1
0.13.3-5.10.1
python-ecdsa
SUSE:OpenStack Cloud Crowbar 9
From an advisory covering 2 CVEs
 before 0.13.3-5.10.1
0.13.3-5.10.1
python-ecdsa
SUSE:Linux Enterprise Module for Public Cloud 12
From an advisory covering 2 CVEs
 before 0.13.3-5.10.1
0.13.3-5.10.1
python-ecdsa
SUSE:Manager Server 3.2
From an advisory covering 2 CVEs
 before 0.13.3-5.10.1
0.13.3-5.10.1
python-ecdsa
Ubuntu:16.04:LTS
 before 0.13-2ubuntu0.16.04.1, plus listed versions
0.13-2
0.13-2ubuntu0.16.04.1
python-ecdsa
Ubuntu:18.04:LTS
 before 0.13-2ubuntu0.18.04.1, plus listed versions
0.13-2
0.13-2ubuntu0.18.04.1
python-ecdsa
Ubuntu:16.04:LTS
From an advisory covering 2 CVEs
 before 0.13-2ubuntu0.16.04.1, plus listed versions
0.13-2
0.13-2ubuntu0.16.04.1
python-ecdsa
Ubuntu:18.04:LTS
From an advisory covering 2 CVEs
 before 0.13-2ubuntu0.18.04.1, plus listed versions
0.13-2
0.13-2ubuntu0.18.04.1
python-ecdsa
openSUSE:Leap 15.0
From an advisory covering 2 CVEs
 before 0.13.3-lp150.2.3.1
0.13.3-lp150.2.3.1
python-ecdsa
openSUSE:Leap 15.1
From an advisory covering 2 CVEs
 before 0.13.3-lp151.3.3.1
0.13.3-lp151.3.3.1
python-ecdsa
openSUSE:Tumbleweed
From an advisory covering 2 CVEs
 before 0.16.1-1.5
0.16.1-1.5
python-ecdsa
openSUSE:Tumbleweed
From an advisory covering 2 CVEs
 before 0.19.0-1.1
0.19.0-1.1
python-ecdsa
openSUSE:Tumbleweed
From an advisory covering 2 CVEs
 before 0.19.2-2.2
0.19.2-2.2

History

History
RecordedChangedSources
affected, facts
affected, aliases, referencesOSV
aliases, productsEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2019-14859 is a high vulnerability (CVSS 7.4) in Python-ecdsa Project Python-ecdsa, published October 14, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.53%, the 74th percentile. Fixed in ecdsa 0.13.3.

References

Show 194 moreShow less
This page doesn't list everything

Left out here: 419 references. The JSON record has them.

Pages All vulnerabilities Browse Docs Sources Guide Get API key
MoveEnter Open