Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Flask-Reuploaded versions before 1.5.0 for PyPI are affected by a path traversal and extension bypass flaw. The source says a remote attacker can write arbitrary files and achieve remote code execution through server-side template injection, though it does not describe the specific steps or required access. Upgrade flask-reuploaded to 1.5.0 or later; until then, the source advises not passing user input to the name parameter, using auto-generated filenames only, or strictly validating name input.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 9.8 | Critical | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.013, the 71st percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:07 UTC First seen by agentprime
- 31 Oct 2026, 14:07 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-65mp-fq8v-56jr
- OSV: GHSA-65mp-fq8v-56jr
- github.com/jugmac00/flask-reuploaded/security/advisories/GHSA-65mp-fq8v-56jr
- nvd.nist.gov/vuln/detail/CVE-2026-27641
- github.com/jugmac00/flask-reuploaded/pull/180
- github.com/jugmac00/flask-reuploaded/commit/d64c6b2f71cb73734fc38baa0e3e156926361288
- github.com/jugmac00/flask-reuploaded
- github.com/pypa/advisory-database/tree/main/vulns/flask-reuploaded/PYSEC-2026-341.yaml
- pypi.org/project/flask-reuploaded