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Not in CISA KEV
MEDIUM severity

CVE-2020-15703 — aptdaemon

MEDIUM

CVE-2020-15703 is a medium-severity (CVSS 4) Path Traversal vulnerability in aptdaemon. 1 public exploit or proof-of-concept reference is indexed, so weaponization risk is real. A fix is available for aptdaemon — see the affected versions and patch details below.

aptdaemon Information Disclosure via Improper Input Validation in Transaction class

Also known asPYSEC-2026-783
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs42th percentile — riskier than 42% of all scored CVEsHighest risk
0.00%0.33%0.66%0.99%0.0%0.5%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐍aptdaemon

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

There is no input validation on the Locale property in an apt transaction. An unprivileged user can supply a full path to a writable directory, which lets aptd read a file as root. Having a symlink in place results in an error message if the file exists, and no error otherwise. This way an unprivileged user can check for the existence of any files on the system as root.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIaptdaemonall versions1.1.1pip install --upgrade 'aptdaemon==1.1.1'

Affected Products

1 product · 3 configurations
Application
aptdaemonaptdaemon_project
1 version
1.1.1
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

There is no input validation on the Locale property in an apt transactio…

eyecontrol.nlNVDNov 2020

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for aptdaemon, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update aptdaemon to 1.1.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-15703 is resolved across your whole dependency graph.

  3. Workarounds

    Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.

Frequently Asked Questions

There is no input validation on the Locale property in an apt transaction. An unprivileged user can supply a full path to a writable directory, which lets aptd read a file as root. Having a symlink in place results in an error message if the file exists, and no error otherwise. This way an unprivileged user can check for the existence of any files on the system as root.
O3 Security · Impact-Aware SCA

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CVE-2020-15703: aptdaemon — Fixed in 1.1.1