How severe is CVE-2021-3726?

CVE-2021-3726 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-3726 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3726?

CVE-2021-3726 affects Planetargon Oh My Zsh. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3726?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-3726 published?

CVE-2021-3726 was published on 2021-11-30 and last updated on 2026-06-17.

CVE-2021-3726

CVE-2021-3726 is a high-severity vulnerability in Planetargon Oh My Zsh with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.5
EPSS exploit prediction: 1% (52nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Planetargon Oh My Zsh
Published: 2021-11-30
Last modified: 2026-06-17

Description

# Vulnerability in `title` function **Description**: the `title` function defined in `lib/termsupport.zsh` uses `print` to set the terminal title to a user-supplied string. In Oh My Zsh, this function is always used securely, but custom user code could use the `title` function in a way that is unsafe. **Fixed in**: [a263cdac](https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac). **Impacted areas**: - `title` function in `lib/termsupport.zsh`. - Custom user code using the `title` function.

Frequently asked questions

What is CVE-2021-3726?: # Vulnerability in `title` function **Description**: the `title` function defined in `lib/termsupport.zsh` uses `print` to set the terminal title to a user-supplied string. In Oh My Zsh, this function is always used securely, but custom user code could use the `title` function in a way that is unsafe. **Fixed in**: [a263cdac](https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac). **Impacted areas**: - `title` function in `lib/termsupport.zsh`. - Custom user code using the `title` function.
How severe is CVE-2021-3726?: CVE-2021-3726 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-3726 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3726?: CVE-2021-3726 affects Planetargon Oh My Zsh. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3726?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-3726 published?: CVE-2021-3726 was published on 2021-11-30 and last updated on 2026-06-17.

References

https://github.com/ohmyzsh/ohmyzsh/commit/a263cdac

Affected products (1)

cpe:2.3:a:planetargon:oh_my_zsh:*:*:*:*:*:*:*:*

More vulnerabilities in Planetargon Oh My Zsh

CVE-2021-3769 — High (CVSS 7.5): # Vulnerability in `pygmalion`, `pygmalion-virtualenv` and `refined` themes **Description**: these themes use `print…
CVE-2021-3727 — High (CVSS 7.5): # Vulnerability in `rand-quote` and `hitokoto` plugins **Description**: the `rand-quote` and `hitokoto` fetch quotes…
CVE-2021-3725 — High (CVSS 7.5): Vulnerability in dirhistory plugin Description: the widgets that go back and forward in the directory history,…
CVE-2021-3934 — High (CVSS 7.5): ohmyzsh is vulnerable to Improper Neutralization of Special Elements used in an OS Command

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