aiohttp's ClientSession is vulnerable to CRLF injection via method
Priority MEDIUM 63CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Partial Red Hat: 4 fixed, 1 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat.
Summary
aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Improper validation makes it possible for an attacker to modify the HTTP request (e.g. insert a new header) or even create a new HTTP request if the attacker controls the HTTP method. The vulnerability occurs only if the attacker can control the HTTP method (GET, POST etc.) of the request. If the attacker can control the HTTP version of the request it will be able to modify the request (request smuggling). This issue has been patched in version 3.9.0.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00948 61st percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix Partial aiohttp (aio-libs): 3.9.0aiohttp (PyPI): 3.9.0Red Hat: 3 advisoriesRed Hat: 4 fixed, 1 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| aio-libs | aiohttp | before 3.9.0 | 3.9.0 | Patch available | CNA |
| — | aiohttp (PyPI) | before 3.9.0 | 3.9.0 | Patch available | GHSA-qvrw-v9rv-5rjx |
- aiohttp Vendoraio-libs Affected before 3.9.0 Fixed in 3.9.0 Patch available CNA
- aiohttp (PyPI) Vendor— Affected before 3.9.0 Fixed in 3.9.0 Patch available GHSA-qvrw-v9rv-5rjx
Remediation
- Fix · CNA aiohttp (aio-libs) Fixed in 3.9.0
- Fix · GHSA-qvrw-v9rv-5rjx aiohttp (PyPI) Fixed in 3.9.0 Advisory →
Red Hat 3 advisories
- RHSA-2024:2010 Released 2024-04-23 · Red Hat rating ImportantSatellite 6.15.0 release
- Red Hat Satellite 6.15 for RHEL 8 foreman-3.9.1.6-1.el8sat, foreman-cli-3.9.1.6-1.el8sat, foreman-debug-3.9.1.6-1.el8sat +28
- RHSA-2024:1878 Released 2024-04-18 · Red Hat rating ModerateRHUI 4.8 Release - Security Updates, Bug Fixes, and Enhancements
- RHUI 4 for RHEL 8 python-aiohttp-3.9.2-1.el8ui, python-cryptography-41.0.6-1.el8ui, python-django-4.2.11-1.el8ui +7
- RHSA-2024:1057 Released 2024-02-29 · Red Hat rating ImportantRed Hat Ansible Automation Platform 2.4 Product Security and Bug Fix Update
- Red Hat Ansible Automation Platform 2.4 for RHEL 8 ansible-automation-platform-installer-2.4-6.el8ap, ansible-rulebook-1.0.5-1.el8ap, automation-eda-controller-1.0.5-1.el8ap +14
- Red Hat Ansible Automation Platform 2.4 for RHEL 9 ansible-automation-platform-installer-2.4-6.el9ap, ansible-rulebook-1.0.5-1.el9ap, automation-eda-controller-1.0.5-1.el9ap +14
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Ansible Automation Platform 1.2 | Affected | No fix planned: Out of support scope |
| RHUI 4 for RHEL 8 | Fixed | RHSA-2024:1878 |
| Red Hat Ansible Automation Platform 2.4 for RHEL 8 | Fixed | RHSA-2024:1057 |
| Red Hat Ansible Automation Platform 2.4 for RHEL 9 | Fixed | RHSA-2024:1057 |
| Red Hat Satellite 6.15 for RHEL 8 | Fixed | RHSA-2024:2010 |
Not affected: 4 products
- RHUI 4 for RHEL 8
- Red Hat Ansible Automation Platform 2.4 for RHEL 8
- Red Hat Ansible Automation Platform 2.4 for RHEL 9
- Red Hat Satellite 6.15 for RHEL 8
Timeline
- 2026-10-02 Threatist record created from CVE-2023-49082
- 2026-10-03 Alias added: GHSA-qvrw-v9rv-5rjx
References
Exploit 2
Other 7
- https://github.com/aio-libs/aiohttp/pull/7806/files
- https://github.com/aio-libs/aiohttp/commit/e4ae01c2077d2cfa116aa82e4ff6866857f7c466
- https://github.com/aio-libs/aiohttp
- https://github.com/pypa/advisory-database/tree/main/vulns/aiohttp/PYSEC-2023-251.yaml
- https://lists.debian.org/debian-lts-announce/2025/02/msg00002.html
- https://lists.fedoraproject.org/archives/list/[email protected]/message/TY5SI6NK5243DEEDQUFKQKW5GQNKQUMA
- https://lists.fedoraproject.org/archives/list/[email protected]/message/WSYWMP64ZFCTC3VO6RY6EC6VSSMV6I3A
More aio-libs vulnerabilities
- TI-2025-38826 aiomysql allows arbitrary access to client files through vulnerability of a malicious MySQL server CVSS 4.0HIGH 8.2
- TI-2024-15436 aiohttp.web.static(follow_symlinks=True) is vulnerable to directory traversal CVSS 3.1HIGH 7.5
- TI-2023-25769 Request smuggling in aiohttp CVSS 3.1HIGH 7.5
- TI-2023-18906 aiohttp vulnerable to HTTP request smuggling CVSS 3.1HIGH 7.5
- TI-2023-26746 aiohttp's ClientSession is vulnerable to CRLF injection via version CVSS 3.1HIGH 7.2
- TI-2026-66145 Multidict: Reference leak in CIMultiDict/MultiDict items-view union and subtraction CVSS 3.1MEDIUM 5.3
Sources
- CVE-2023-49082 · CVE Program
- CVE-2023-49082 · NVD
- FIRST EPSS
- GHSA-qvrw-v9rv-5rjx · GitHub Advisory Database · CC BY 4.0
- CVE-2023-49082 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences