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Vulnerability record · CVE-2019-15796 · published 26 March 2020

CVE-2019-15796: Ubuntu python-apt improper authentication vulnerability

Ubuntu · Python Apt

Python-apt doesn't check if hashes are signed in `Version.fetch_binary()` and `Version.fetch_source()` of apt/package.py or in `_fetch_archives()` of apt/cache.py in version 1.9.3ubuntu2 and earlier. This allows downloads from unsigned repositories which shouldn't be allowed and has been fixed in verisions 1.9.5, 1.9.0ubuntu1.2, 1.6.5ubuntu0.1, 1.1.0~beta1ubuntu0.16.04.7, 0.9.3.5ubuntu3+esm2, and 0.8.3ubuntu7.5.

4.7 CVSS 3.1 Medium EPSS 0.51% · top 58.9% CWE-287 · Improper authenticationCWE-347 · Improper verification of cryptographic signature
4.7CVSS 3.1 base score, v2 2.6
0.51%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

Python-apt doesn't check if hashes are signed in `Version.fetch_binary()` and `Version.fetch_source()` of apt/package.py or in `_fetch_archives()` of apt/cache.py in version 1.9.3ubuntu2 and earlier. This allows downloads from unsigned repositories which shouldn't be allowed and has been fixed in verisions 1.9.5, 1.9.0ubuntu1.2, 1.6.5ubuntu0.1, 1.1.0~beta1ubuntu0.16.04.7, 0.9.3.5ubuntu3+esm2, and 0.8.3ubuntu7.5.

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://usn.ubuntu.com/4247-1/ PatchThird Party Advisory
https://usn.ubuntu.com/4247-3/ PatchThird Party Advisory
https://usn.ubuntu.com/4247-1/ PatchThird Party Advisory
https://usn.ubuntu.com/4247-3/ PatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-15796), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.