Flask-Reuploaded vulnerable to Remote Code Execution via Server-Side Template Injection

flask-reuploaded (pip)

A critical path traversal and extension bypass vulnerability in Flask-Reuploaded allows remote attackers to achieve arbitrary file write and remote code execution through Server-Side Template Injection (SSTI). Flask-Reuploaded has been patched in version 1.5.0 1. Do not pass user input to the name parameter 2.

Fix it

pip install --upgrade "flask-reuploaded>=1.5.0"

First seen: 25 Feb 2026
Last update: 25 Feb 2026, 19:06 UTC
Fixed in: flask-reuploaded 1.5.0
Identifiers: CVE-2026-27641
Source: GitHub advisory
On the menu as: PyPI packages
Python

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Flask-Reuploaded vulnerable to Remote Code Execution via Server-Side Template Injection
Severity: critical. Patch status: patched.
Affected: flask-reuploaded (pip)
Fixed in: flask-reuploaded 1.5.0
Ids: CVE-2026-27641

A critical path traversal and extension bypass vulnerability in Flask-Reuploaded allows remote attackers to achieve arbitrary file write and remote code execution through Server-Side Template Injection (SSTI). Flask-Reuploaded has been patched in version 1.5.0 1. Do not pass user input to the name parameter 2.

## Steps
1. Search the repo, its CI and infra config for flask-reuploaded (pip). If present, report the version in use and whether it's affected.

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-27641") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://github.com/advisories/GHSA-65mp-fq8v-56jr https://github.com/jugmac00/flask-reuploaded/commit/d64c6b2f71cb73734fc38baa0e3e156926361288 https://github.com/jugmac00/flask-reuploaded/pull/180 https://github.com/jugmac00/flask-reuploaded/security/advisories/GHSA-65mp-fq8v-56jr https://nvd.nist.gov/vuln/detail/CVE-2026-27641
https://pwned.coffee/i/flask-reuploaded-vulnerable-to-remote-code-execution-via-cve-2026-27641

Sources

Wrong fix version, or a source we missed? Send it back to chef@pwned.coffee with the source, and we'll correct it here.

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