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CRITICAL severity

CVE-2021-40720 — ops-cli

CRITICAL

CVE-2021-40720 is a critical-severity (CVSS 9.8) Deserialization of Untrusted Data vulnerability in ops-cli. A fix is available for ops-cli — see the affected versions and patch details below.

Ops CLI Deserialization of Untrusted Data vulnerability

Also known asGHSA-x23q-4j9j-9cxwPYSEC-2021-380
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
9.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs95th percentile — riskier than 95% of all scored CVEsHighest risk
7.45%10.6%13.8%16.9%15.1%9.5%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
🐍ops-cli

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

Ops CLI version 2.0.4 (and earlier) is affected by a Deserialization of Untrusted Data vulnerability to achieve arbitrary code execution when the checkout_repo function is called on a maliciously crafted file. An attacker can leverage this to execute arbitrary code on the victim machine.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIops-cliall versions2.0.5pip install --upgrade 'ops-cli==2.0.5'

Affected Products

1 product · 1 configurations
Application
ops-cliadobe
< 2.0.5
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update ops-cli to 2.0.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-40720 is resolved across your whole dependency graph.

  3. Workarounds

    Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.

Frequently Asked Questions

Ops CLI version 2.0.4 (and earlier) is affected by a Deserialization of Untrusted Data vulnerability to achieve arbitrary code execution when the checkout_repo function is called on a maliciously crafted file. An attacker can leverage this to execute arbitrary code on the victim machine.
O3 Security · Impact-Aware SCA

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CVE-2021-40720: ops-cli RCE — Fixed in 2.0.5