Description
corydolphin/flask-cors is vulnerable to log injection when the log level is set to debug. An attacker can inject fake log entries into the log file by sending a specially crafted GET request containing a CRLF sequence in the request path. This vulnerability allows attackers to corrupt log files, potentially covering tracks of other attacks, confusing log post-processing tools, and forging log entries. The issue is due to improper output neutralization for logs.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| corydolphin | corydolphin/flask-cors | unspecified – ≤ latest | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | python-flask-cors | 4.0.1-1 | — |
| Debian 13 | python-flask-cors | 4.0.1-1 | — |
| Debian 12 | python-flask-cors | 3.0.10-2+deb12u1 | — |
| Debian 11 | python-flask-cors | 3.0.9-2+deb11u1 | DLA-4197-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | python-flask-cors | 3.0.9-2ubuntu0.1 | USN-7612-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | python-flask-cors | 4.0.0-1ubuntu0.1~esm1 | USN-7612-1 |
| Ubuntu Pro 20.04 LTS | python-flask-cors | 3.0.8-2ubuntu0.1+esm1 | USN-7612-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | python-Flask-Cors | 4.0.1-1.1 | openSUSE-SU-2026:11990-1, openSUSE-SU-2024:14293-1 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | kubeflow-jupyter-web-app | 1.8.0-r7 | — |
| Wolfi rolling | kubeflow-volumes-web-app | 1.8.0-r6 | — |
| Wolfi rolling | py3-flask-cors +5 | 4.0.1-r0 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | flask-cors | < 4.0.1 | 4.0.1 | GHSA-84pr-m4jr-85g5 |
| PyPI | flask-cors | <= 4.0.0 | — | PYSEC-2024-271 |
Advisories 4
- openSUSE-SU-2026:11990-1 python313-Flask-Cors-6.0.2-1.2 on GA media SUSE / openSUSE Security Updates · Oct 5, 2026
- USN-7612-1 python-flask-cors vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-4197-1 python-flask-cors - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:14293-1 python310-Flask-Cors-4.0.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026