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

> Attackers can execute arbitrary scripts in victims' browsers by exploiting a Markdown URL sanitization bypass in Pi's HTML session exports.

- **Severity:** Low 2.5 (`CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 23 Jun 2026
- **Updated:** 24 Jun 2026
- **Also known as:** GHSA-7v5m-pr3q-6453, MINI-gc3h-mgpf-54f6

## What is CVE-2026-54326?

CVE-2026-54326 is a low-severity cross-site scripting vulnerability in earendil-works pi, published on 23 Jun 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official 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.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-54326?

4 open source packages ship an affected version, including @earendil-works/pi-coding-agent and @mariozechner/pi-coding-agent.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `@earendil-works/pi-coding-agent` | npm | From 0.74.0 | 0.78.1 |
| `@earendil-works/pi-coding-agent` | npm | From 0.74.0 | 0.78.1 |
| `@mariozechner/pi-coding-agent` | npm | From 0.27.5 to 0.73.1 | None |
| `@mariozechner/pi-coding-agent` | npm | From 0.27.5 to 0.73.1 | None |

## How do I fix CVE-2026-54326?

Upgrade @earendil-works/pi-coding-agent to 0.78.1 or later.

## Is CVE-2026-54326 being exploited?

There is no known exploitation of CVE-2026-54326 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-54326 and fix it if it is affected.

What it is: CVE-2026-54326 is a low-severity cross-site scripting vulnerability in earendil-works pi, published on 23 Jun 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-54326 in the wild and no public exploit code.

Affected packages and fixed versions:
- @earendil-works/pi-coding-agent (npm): affected from 0.74.0; fixed in 0.78.1
- @earendil-works/pi-coding-agent (npm): affected from 0.74.0; fixed in 0.78.1
- @mariozechner/pi-coding-agent (npm): affected from 0.27.5 up to 0.73.1; no fix listed
- @mariozechner/pi-coding-agent (npm): affected from 0.27.5 up to 0.73.1; no fix listed

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-54326/ (Markdown: https://insights.sbomify.com/CVE-2026-54326/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-54326
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-54326
- OSV: https://osv.dev/vulnerability/CVE-2026-54326

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-54326/
Summaries are generated and may contain mistakes; the official description above is the record.