CVE-2019-14859

Publication date 14 October 2019

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
python-ecdsa	19.10 eoan	Fixed 0.13.2-2ubuntu0.1
	19.04 disco	Fixed 0.13-3ubuntu0.1
	18.04 LTS bionic	Fixed 0.13-2ubuntu0.18.04.1
	16.04 LTS xenial	Fixed 0.13-2ubuntu0.16.04.1
	14.04 LTS trusty	Not in release

Notes

mdeslaur

included in CVE-2019-14853 commits

Severity score breakdown

Parameter	Value
Base score	9.1 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Related Ubuntu Security Notices (USN)

USN-4196-1
python-ecdsa vulnerabilities
18 November 2019