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3.6
Memray HTML Reports Allow Attackers to Inject Malicious Code
GHSA-r5pr-887v-m2w9
CVE-2026-32722
Summary
Memray versions before 1.19.2 can insert malicious code into HTML reports, which can be executed when a user opens the report in a browser. This can happen if an attacker has control over the process being profiled. To fix this, update to Memray 1.19.2 and avoid attaching Memray to untrusted processes until the update is complete.
What to do
- Update memray to version 1.19.2.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| – | memray | <= 1.19.2 | 1.19.2 |
Original title
Stored XSS in Memray-generated HTML reports via unescaped command-line metadata
Original description
## Summary
Prior to Memray 1.19.2, Memray rendered the command line of the tracked process directly into generated HTML reports without escaping. Because there was no escaping, attacker-controlled command line arguments were inserted as raw HTML into the generated report.
This allowed JavaScript execution when a victim opened the generated report in a browser.
## Affected Version
- Memray version: `1.19.1` and earlier
## Remediation
Upgrade to Memray 1.19.2, and avoid attaching Memray to untrusted processes until you have upgraded.
## Root Cause
Jinja is used to embed the process's command line arguments into the generated flame graph or table report. Memray has not been telling Jinja to HTML escape the command line arguments when writing them into the HTML, leading to a stored XSS vulnerability.
## Impact
An attacker who can influence the script name or command-line arguments of a profiled program can inject HTML/JavaScript into Memray-generated HTML reports (both `memray flamegraph` and `memray table` reports, both with and without `--no-web`). When a victim opens the generated report in a browser, the injected JavaScript executes in the context of the report.
Note that in the case of `memray attach`, the user attaching Memray and generating the report may be a different user than the one who ran the command and set up the command line arguments.
## Proof of Concept
Run Memray on a script with an attacker-controlled filename:
```bash
touch '<img src=x onerror=alert(1)>'
python -m memray run -o poc.bin '<img src=x onerror=alert(1)>'
```
Generate a report:
```bash
python -m memray flamegraph -o poc.html poc.bin
```
## Observed Result
The generated HTML contains raw unescaped attacker-controlled HTML.
Opening or reloading the generated report in a browser triggers JavaScript execution.
Prior to Memray 1.19.2, Memray rendered the command line of the tracked process directly into generated HTML reports without escaping. Because there was no escaping, attacker-controlled command line arguments were inserted as raw HTML into the generated report.
This allowed JavaScript execution when a victim opened the generated report in a browser.
## Affected Version
- Memray version: `1.19.1` and earlier
## Remediation
Upgrade to Memray 1.19.2, and avoid attaching Memray to untrusted processes until you have upgraded.
## Root Cause
Jinja is used to embed the process's command line arguments into the generated flame graph or table report. Memray has not been telling Jinja to HTML escape the command line arguments when writing them into the HTML, leading to a stored XSS vulnerability.
## Impact
An attacker who can influence the script name or command-line arguments of a profiled program can inject HTML/JavaScript into Memray-generated HTML reports (both `memray flamegraph` and `memray table` reports, both with and without `--no-web`). When a victim opens the generated report in a browser, the injected JavaScript executes in the context of the report.
Note that in the case of `memray attach`, the user attaching Memray and generating the report may be a different user than the one who ran the command and set up the command line arguments.
## Proof of Concept
Run Memray on a script with an attacker-controlled filename:
```bash
touch '<img src=x onerror=alert(1)>'
python -m memray run -o poc.bin '<img src=x onerror=alert(1)>'
```
Generate a report:
```bash
python -m memray flamegraph -o poc.html poc.bin
```
## Observed Result
The generated HTML contains raw unescaped attacker-controlled HTML.
Opening or reloading the generated report in a browser triggers JavaScript execution.
ghsa CVSS3.1
3.6
Vulnerability type
CWE-79
Cross-site Scripting (XSS)
Published: 16 Mar 2026 · Updated: 16 Mar 2026 · First seen: 16 Mar 2026