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Vulnerabilities

Vulnerability · CVE-2026-27641

Flask-Reuploaded provides file uploads for Flask.

Published Feb 25, 2026 · catalog updated Jun 17, 2026 · Flask-Reuploaded provides file uploads

Check if you run it

No confirmed exploitation is on record for CVE-2026-27641. EPSS is 1.27%. Act only if a listed version of Flask-Reuploaded provides file uploads is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Flask-Reuploaded provides file uploads).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.27%
Remediation
Advisory link
Affected products
cpe jugmac00/flask-reuploaded

Flask-Reuploaded provides file uploads for Flask. A critical path traversal and extension bypass vulnerability in versions prior to 1.5.0 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. Some workarounds are available. Do not pass user input to the parameter, use auto-generated filenames only, and implement strict input validation if must be used.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe jugmac00/flask-reuploadedversion unspecified

How to fix CVE-2026-27641

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-27641. EPSS is 1.27%. Act only if a listed version of Flask-Reuploaded provides file uploads is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine; CWE-22: Path Traversal. EPSS 1.27%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 25, 2026 · NIST NVD

    Detected

    Flask-Reuploaded provides file uploads for Flask. A critical path traversal and extension bypass vulnerability in versions prior to 1.5.0 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. Some workarounds are available. Do not pass user input to the parameter, use auto

  2. Jun 17, 2026 · NIST NVD

    Updated

    Flask-Reuploaded provides file uploads for Flask. A critical path traversal and extension bypass vulnerability in versions prior to 1.5.0 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. Some workarounds are available. Do not pass user input to the parameter, use auto

Sources

  • CVE.orgVulnerability recordCVE-2026-27641

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-27641

    30-day exploitation probability 1.3%

    first.org
  • NIST NVDVulnerability recordCVE-2026-27641

    Flask-Reuploaded provides file uploads for Flask. A critical path traversal and extension bypass vulnerability in versions prior to 1.5.0 allows remote attackers to achieve arbitrary file write and remote code execution through Server-Side Template Injection (SSTI). Flask-Reuploa

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.