# CVE-2024-27306: aiohttp vulnerable to XSS on index pages for static file handling > Cross-site scripting vulnerability in aiohttp static file index pages allows attackers to execute scripts, affecting users who enable show_index. - **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** A user has to click or open something - **Fix available:** Yes - **Published:** 18 Apr 2024 - **Updated:** 3 Nov 2025 - **Also known as:** AZL-43357, AZL-43372, DEBIAN-CVE-2024-27306, ECHO-69fb-b299-e120, GHSA-7gpw-8wmc-pm8g, MGASA-2024-0235, PYSEC-2026-1102, ROOT-APP-PYPI-CVE-2024-27306, SUSE-SU-2024:1866-1, SUSE-SU-2024:4396-1, UBUNTU-CVE-2024-27306, openSUSE-SU-2024:13965-1 ## What is CVE-2024-27306? CVE-2024-27306 is a medium-severity cross-site scripting vulnerability in Fedoraproject Fedora, published on 18 Apr 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. ### Official description aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. A XSS vulnerability exists on index pages for static file handling. This vulnerability is fixed in 3.9.4. We have always recommended using a reverse proxy server (e.g. nginx) for serving static files. Users following the recommendation are unaffected. Other users can disable `show_index` if unable to upgrade. Weakness: CWE-80 (Improper Neutralization of Script-Related HTML Tags in a Web Page), CWE-79 (Improper Neutralization of Input During Web Page Generation) ## Which versions are affected by CVE-2024-27306? 3 open source packages ship an affected version, including aiohttp. It affects 2 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `aiohttp` | PyPI | All versions | 3.9.4 | | `aiohttp` | PyPI | All versions | 3.9.4 | | `aiohttp` | PyPI | All versions | 3.9.4 | | `python-aiohttp` | SUSE:Linux Enterprise Module for Public Cloud 15 SP2 | All versions | 3.6.0-150100.3.24.1 | | `python-aiohttp` | SUSE:Linux Enterprise Module for Public Cloud 15 SP3 | All versions | 3.6.0-150100.3.24.1 | | `python-aiohttp` | SUSE:Linux Enterprise Module for Public Cloud 15 SP4 | All versions | 3.6.0-150100.3.24.1 | | `python-aiohttp` | SUSE:Linux Enterprise Module for Public Cloud 15 SP4 | All versions | 3.9.3-150400.10.21.1 | | `python-aiohttp` | SUSE:Linux Enterprise Module for Public Cloud 15 SP5 | All versions | 3.6.0-150100.3.24.1 | | `python-aiohttp` | SUSE:Linux Enterprise Module for Public Cloud 15 SP6 | All versions | 3.6.0-150100.3.24.1 | | `python-aiohttp` | SUSE:Linux Enterprise Module for Python 3 15 SP5 | All versions | 3.9.3-150400.10.21.1 | | `python-aiohttp` | SUSE:Linux Enterprise Module for Python 3 15 SP6 | All versions | 3.9.3-150400.10.21.1 | | `python-aiohttp` | openSUSE:Leap 15.5 | All versions | 3.6.0-150100.3.24.1 | | `python-aiohttp` | openSUSE:Leap 15.5 | All versions | 3.9.3-150400.10.21.1 | | `python-aiohttp` | openSUSE:Leap 15.6 | All versions | 3.9.3-150400.10.21.1 | | `python-aiohttp` | openSUSE:Tumbleweed | All versions | 3.9.5-2.1 | Products: Aiohttp Aiohttp, Fedoraproject Fedora. ## How do I fix CVE-2024-27306? Upgrade aiohttp to 3.9.4 or later. ## Is CVE-2024-27306 being exploited? There is no known exploitation of CVE-2024-27306 in the wild and no public exploit code. ## Other vulnerabilities in Fedoraproject Fedora - [CVE-2024-52303](https://insights.sbomify.com/CVE-2024-52303/): aiohttp memory leak when middleware is enabled when requesting a resource with a non-allowed method (high 8.7) - [CVE-2025-69223](https://insights.sbomify.com/CVE-2025-69223/): AIOHTTP's HTTP Parser auto_decompress feature is vulnerable to zip bomb (high 7.5) - [CVE-2024-30251](https://insights.sbomify.com/CVE-2024-30251/): Denial of service when trying to parse malformed POST requests in aiohttp (high 7.5) - [CVE-2023-49081](https://insights.sbomify.com/CVE-2023-49081/): aiohttp's ClientSession is vulnerable to CRLF injection via version (high 7.2) - [CVE-2026-22815](https://insights.sbomify.com/CVE-2026-22815/): AIOHTTP: Uncapped memory usage possible through aiohttp allowing unlimited trailer headers (medium 6.9) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2024-27306 and fix it if it is affected. What it is: CVE-2024-27306 is a medium-severity cross-site scripting vulnerability in Fedoraproject Fedora, published on 18 Apr 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. Exploitation: There is no known exploitation of CVE-2024-27306 in the wild and no public exploit code. Affected packages and fixed versions: - aiohttp (PyPI): affected all versions; fixed in 3.9.4 - aiohttp (PyPI): affected all versions; fixed in 3.9.4 - aiohttp (PyPI): affected all versions; fixed in 3.9.4 Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2024-27306/ (Markdown: https://insights.sbomify.com/CVE-2024-27306/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2024-27306 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-27306 - OSV: https://osv.dev/vulnerability/CVE-2024-27306 --- From sbomify Insights: https://insights.sbomify.com/CVE-2024-27306/ Summaries are generated and may contain mistakes; the official description above is the record.