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CVE-2019-15796

python-apt downloads from untrusted sources

4.7 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.51%Down 0.1 points since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List Score used 4.7

python-apt downloads from untrusted sources

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.

Record
CVE-2019-15796
CVSS 3.1
4.7 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-287
Updated
2026-11-02
EUVDEUVD-2022-4782 4.7

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.

Record
EUVD-2022-4782
CVSS 3.1
4.7 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-pj65-3pf6-c5q4 4.7

python-apt Does Not Check Hash Signature

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.

Record
GHSA-pj65-3pf6-c5q4
CVSS 3.1
4.7 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-347
Updated
2026-11-02
NVD 4.7

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.

Record
CVE-2019-15796
CVSS 3.1
4.7 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
CVSS 2.0
2.6 LowAV:N/AC:H/Au:N/C:N/I:P/A:N
Weakness
CWE-287, CWE-347
Updated
2026-11-02
OSV 4.7

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.

Record
CVE-2019-15796
CVSS 3.1
4.7 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2019-15796 4.7

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.

Record
DEBIAN-CVE-2019-15796
CVSS 3.1
4.7 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-02
Show 4 moreShow less
OSVGHSA-pj65-3pf6-c5q4 4.7

python-apt Does Not Check Hash Signature

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.

Record
GHSA-pj65-3pf6-c5q4
CVSS 3.1
4.7 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-347
Updated
2026-11-02
OSVUBUNTU-CVE-2019-15796 4.7

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.

Record
UBUNTU-CVE-2019-15796
CVSS 3.1
4.7 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-02
OSVUSN-4247-1 No score

python-apt vulnerabilities

It was discovered that python-apt would still use MD5 hashes to validate certain downloaded packages. If a remote attacker were able to perform a machine-in-the-middle attack, this flaw could potentially be used to install altered packages. (CVE-2019-15795)

It was discovered that python-apt could install packages from untrusted repositories, contrary to expectations. (CVE-2019-15796)

Record
USN-4247-1
Updated
2026-11-02
OSVUSN-4247-3 No score

python-apt vulnerabilities

USN-4247-1 fixed several vulnerabilities in python-apt. This update provides the corresponding updates for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

It was discovered that python-apt would still use MD5 hashes to validate certain downloaded packages. If a remote attacker were able to perform a machine-in-the-middle attack, this flaw could potentially be used to install altered packages. (CVE-2019-15795)

It was discovered that python-apt could install packages from untrusted repositories, contrary to expectations. (CVE-2019-15796)

Record
USN-4247-3
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
python-apt
PyPI
 before 0.8.3ubuntu7.5
0.8.3ubuntu7.5
python-apt
PyPI
 0.9.0 up to 0.9.3.5ubuntu3
0.9.3.5ubuntu3
python-apt
PyPI
 1.2.0 up to 1.6.5ubuntu0.1
1.6.5ubuntu0.1
python-apt
PyPI
 1.7.0 up to 1.9.0ubuntu1.2
1.9.0ubuntu1.2
python-apt
PyPI
 1.9.1 up to 1.9.5
1.9.5
python-apt
Debian:12
 before 1.8.5
1.8.5
python-apt
Debian:13
 before 1.8.5
1.8.5
python-apt
Debian:14
 before 1.8.5
1.8.5
python-apt
Debian:8
From an advisory covering 2 CVEs
 before 0.9.3.13, plus listed versions
0.9.3.110.9.3.12
0.9.3.13
python-apt
Debian:9
From an advisory covering 2 CVEs
 before 1.4.1, plus listed versions
1.4.0~beta3
1.4.1
Show 7 moreShow less
Affected packages
PackageAffectedFixed
python-apt
Debian:10
From an advisory covering 2 CVEs
 before 1.8.4.1, plus listed versions
1.8.4
1.8.4.1
python-apt
Ubuntu:Pro:14.04:LTS
 before 0.9.3.5ubuntu3+esm2, plus listed versions
0.8.9.1ubuntu10.9.00.9.10.9.1ubuntu10.9.3.2
Show 9 moreShow less
0.9.3.2ubuntu20.9.3.30.9.3.3ubuntu10.9.3.40.9.3.4build10.9.3.50.9.3.5ubuntu10.9.3.5ubuntu20.9.3.5ubuntu3
0.9.3.5ubuntu3+esm2
python-apt
Ubuntu:16.04:LTS
 before 1.1.0~beta1ubuntu0.16.04.7, plus listed versions
1.0.1build11.0.1ubuntu21.1.0~beta11.1.0~beta1build11.1.0~beta1ubuntu0.16.04.11.1.0~beta1ubuntu0.16.04.21.1.0~beta1ubuntu0.16.04.41.1.0~beta1ubuntu0.16.04.5
1.1.0~beta1ubuntu0.16.04.7
python-apt
Ubuntu:18.04:LTS
 before 1.6.5ubuntu0.1, plus listed versions
1.4.0~beta3build21.4.0~beta3ubuntu11.6.0~rc2ubuntu11.6.0~rc2ubuntu21.6.0
Show 5 moreShow less
1.6.11.6.21.6.31.6.3ubuntu11.6.4
1.6.5ubuntu0.1
python-apt
Ubuntu:16.04:LTS
From an advisory covering 2 CVEs
 before 1.1.0~beta1ubuntu0.16.04.7, plus listed versions
1.0.1build11.0.1ubuntu21.1.0~beta11.1.0~beta1build11.1.0~beta1ubuntu0.16.04.11.1.0~beta1ubuntu0.16.04.21.1.0~beta1ubuntu0.16.04.41.1.0~beta1ubuntu0.16.04.5
1.1.0~beta1ubuntu0.16.04.7
python-apt
Ubuntu:18.04:LTS
From an advisory covering 2 CVEs
 before 1.6.5ubuntu0.1, plus listed versions
1.4.0~beta3build21.4.0~beta3ubuntu11.6.0~rc2ubuntu11.6.0~rc2ubuntu21.6.0
Show 5 moreShow less
1.6.11.6.21.6.31.6.3ubuntu11.6.4
1.6.5ubuntu0.1
python-apt
Ubuntu:Pro:14.04:LTS
From an advisory covering 2 CVEs
 before 0.9.3.5ubuntu3+esm2, plus listed versions
0.8.9.1ubuntu10.9.00.9.10.9.1ubuntu10.9.3.2
Show 9 moreShow less
0.9.3.2ubuntu20.9.3.30.9.3.3ubuntu10.9.3.40.9.3.4build10.9.3.50.9.3.5ubuntu10.9.3.5ubuntu20.9.3.5ubuntu3
0.9.3.5ubuntu3+esm2

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2019-15796 is a medium vulnerability (CVSS 4.7) in Canonical Python-apt, published January 20, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.51%, the 43rd percentile. Fixed in python-apt 0.8.3ubuntu7.5.

References

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