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Vulnerability record · CVE-2019-15795 · published 26 March 2020

CVE-2019-15795: Ubuntu python-apt broken cryptographic algorithm vulnerability

Ubuntu · Python Apt

python-apt only checks the MD5 sums of downloaded files in `Version.fetch_binary()` and `Version.fetch_source()` of apt/package.py in version 1.9.0ubuntu1 and earlier. This allows a man-in-the-middle attack which could potentially be used to install altered packages and has been fixed in versions 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 0.45% · top 63.3% CWE-327 · Broken cryptographic algorithm
4.7CVSS 3.1 base score, v2 2.6
0.45%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 only checks the MD5 sums of downloaded files in `Version.fetch_binary()` and `Version.fetch_source()` of apt/package.py in version 1.9.0ubuntu1 and earlier. This allows a man-in-the-middle attack which could potentially be used to install altered packages and has been fixed in versions 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/ PatchVendor Advisory
https://usn.ubuntu.com/4247-3/ PatchVendor Advisory
https://usn.ubuntu.com/4247-1/ PatchVendor Advisory
https://usn.ubuntu.com/4247-3/ PatchVendor Advisory

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Related vulnerabilities

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

6.9CVE-2025-6966Ubuntu python-apt null pointer dereference vulnerabilityNULL pointer dereference in TagSection.keys() in python-apt on APT-based Linux systems allows a local attacker to cause a denial of service (process …EPSS 0.15%4.7CVE-2019-15796Ubuntu python-apt improper authentication vulnerabilityPython-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…EPSS 0.51%

Source: NIST National Vulnerability Database (record CVE-2019-15795), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.