# CVE-2026-73036: Bash-it barbuk Theme 3.2.0 Terminal Escape Sequence Injection via pyproject.toml

Status: published. Published: 2026-08-11. Updated: 2026-11-08.

Bash-it 3.2.0 contains a terminal escape sequence injection vulnerability in the barbuk theme's Python virtualenv prompt segment that allows local attackers to inject arbitrary terminal control sequences by embedding escape sequences in the requires-python field of a pyproject.toml file. When a user navigates into a directory containing a maliciously crafted pyproject.toml, the unfiltered field value is read via awk and concatenated directly into PS1 through __prompt-command without stripping control characters, causing injected OSC or CSI sequences to be written to and interpreted by the terminal emulator on every prompt render.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/Bash-it/bash-it/commit/fab8f57818f28bfc6f2a81f86a58981c4ea72e5a
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/Bash-it/bash-it/pull/2397

## Affected products and versions

- Bash-it / Bash-it: ≥ 0; ≤ 3.2.0 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 4.6 (medium); CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 4.4 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.18% as of 2026-11-08; percentile 7.32%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-150

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/Bash-it/bash-it (CNA: VulnCheck; product)

- https://github.com/Bash-it/bash-it/commit/fab8f57818f28bfc6f2a81f86a58981c4ea72e5a (CNA: VulnCheck; patch)

- https://github.com/Bash-it/bash-it/issues/2396 (CNA: VulnCheck; issue-tracking)

- https://github.com/Bash-it/bash-it/pull/2397 (CNA: VulnCheck; technical-description, patch)

- https://www.vulncheck.com/advisories/bash-it-barbuk-theme-terminal-escape-sequence-injection-via-pyproject-toml (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-73036; retrieved 2026-11-08; source updated 2026-11-08

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-73036; retrieved 2026-11-08; source updated Not reported

Revision: 3a6ff505a744a454db18e3ecc3107b634b3e9ff707765c0f523fe571c7085c86

Canonical: https://y2.dev/cve/CVE-2026-73036

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