CVE-2025-69227
published 2026-01-06CVE-2025-69227: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below allow for an infinite loop to occur when assert…
PriorityP343high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.34%
25.9th percentile
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below allow for an infinite loop to occur when assert statements are bypassed, resulting in a DoS attack when processing a POST body. If optimizations are enabled (-O or PYTHONOPTIMIZE=1), and the application includes a handler that uses the Request.post() method, then an attacker may be able to execute a DoS attack with a specially crafted message. This issue is fixed in version 3.13.3.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| aio-libs | aiohttp | < 3.13.3 | 3.13.3 |
| aiohttp | aiohttp | < 3.13.3 | 3.13.3 |
| aiohttp | aiohttp | >= 0 < 3.13.3 | 3.13.3 |
| debian | python-aiohttp | < python-aiohttp 3.13.3-1 (forky) | python-aiohttp 3.13.3-1 (forky) |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv4.06.6MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
osv7.5HIGH
vendor_ubuntu7.5HIGH
vendor_debian6.6MEDIUM
vendor_redhat6.6MEDIUM
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OSV
python-aiohttp vulnerabilities
osv·2026-02-13·CVSS 7.5
CVE-2025-69223 [HIGH] python-aiohttp vulnerabilities
python-aiohttp vulnerabilities
Charles Chan discovered that AIOHTTP incorrectly handled the decompression
of compressed requests. A remote attacker could possibly use this issue to
cause a denial of service. This issue was only addressed in Ubuntu 25.10.
(CVE-2025-69223)
Thomas Rinsma discovered that AIOHTTP incorrectly handled non-ASCII
characters in HTTP headers. A remote attacker could possibly use this issue
to perform a request smuggling attack to bypass certain proxy protections.
This issue was only addressed in Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and
Ubuntu 25.10. (CVE-2025-69224)
Thomas Rinsma discovered that AIOHTTP incorrectly handled non-ASCII
characters in the Range header. A remote attacker could possibly use this
issue to perform a request smuggling attack. (CVE-2025-69225)
OSV
CVE-2025-69227: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python
osv·2026-01-06·CVSS 6.6
CVE-2025-69227 [MEDIUM] CVE-2025-69227: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below allow for an infinite loop to occur when assert statements are bypassed, resulting in a DoS attack when processing a POST body. If optimizations are enabled (-O or PYTHONOPTIMIZE=1), and the application includes a handler that uses the Request.post() method, then an attacker may be able to execute a DoS attack with a specially crafted message. This issue is fixed in version 3.13.3.
OSV
AIOHTTP vulnerable to DoS when bypassing asserts
osv·2026-01-05
CVE-2025-69227 [MEDIUM] AIOHTTP vulnerable to DoS when bypassing asserts
AIOHTTP vulnerable to DoS when bypassing asserts
### Summary
When assert statements are bypassed, an infinite loop can occur, resulting in a DoS attack when processing a POST body.
### Impact
If optimisations are enabled (`-O` or `PYTHONOPTIMIZE=1`), and the application includes a handler that uses the `Request.post()` method, then an attacker may be able to execute a DoS attack with a specially crafted message.
Patch: https://github.com/aio-libs/aiohttp/commit/bc1319ec3cbff9438a758951a30907b072561259
GHSA
AIOHTTP vulnerable to DoS when bypassing asserts
ghsa·2026-01-05
CVE-2025-69227 [MEDIUM] CWE-835 AIOHTTP vulnerable to DoS when bypassing asserts
AIOHTTP vulnerable to DoS when bypassing asserts
### Summary
When assert statements are bypassed, an infinite loop can occur, resulting in a DoS attack when processing a POST body.
### Impact
If optimisations are enabled (`-O` or `PYTHONOPTIMIZE=1`), and the application includes a handler that uses the `Request.post()` method, then an attacker may be able to execute a DoS attack with a specially crafted message.
Patch: https://github.com/aio-libs/aiohttp/commit/bc1319ec3cbff9438a758951a30907b072561259
Ubuntu
AIOHTTP vulnerabilities
vendor_ubuntu·2026-02-13·CVSS 7.5
CVE-2025-69225 [HIGH] AIOHTTP vulnerabilities
Title: AIOHTTP vulnerabilities
Summary: Several security issues were fixed in AIOHTTP.
Charles Chan discovered that AIOHTTP incorrectly handled the decompression
of compressed requests. A remote attacker could possibly use this issue to
cause a denial of service. This issue was only addressed in Ubuntu 25.10.
(CVE-2025-69223)
Thomas Rinsma discovered that AIOHTTP incorrectly handled non-ASCII
characters in HTTP headers. A remote attacker could possibly use this issue
to perform a request smuggling attack to bypass certain proxy protections.
This issue was only addressed in Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and
Ubuntu 25.10. (CVE-2025-69224)
Thomas Rinsma discovered that AIOHTTP incorrectly handled non-ASCII
characters in the Range header. A remote attacker could possibly use this
issu
Red Hat
aiohttp: aiohttp: Denial of Service via specially crafted POST request
vendor_redhat·2026-01-05·CVSS 6.6
CVE-2025-69227 [MEDIUM] CWE-835 aiohttp: aiohttp: Denial of Service via specially crafted POST request
aiohttp: aiohttp: Denial of Service via specially crafted POST request
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below allow for an infinite loop to occur when assert statements are bypassed, resulting in a DoS attack when processing a POST body. If optimizations are enabled (-O or PYTHONOPTIMIZE=1), and the application includes a handler that uses the Request.post() method, then an attacker may be able to execute a DoS attack with a specially crafted message. This issue is fixed in version 3.13.3.
A flaw was found in aiohttp, an asynchronous HTTP client/server framework for Python. A remote attacker could exploit this vulnerability by sending a specially crafted POST request to an application using the Request.post() method, prov
Debian
CVE-2025-69227: python-aiohttp - AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. ...
vendor_debian·2025·CVSS 6.6
CVE-2025-69227 [MEDIUM] CVE-2025-69227: python-aiohttp - AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. ...
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below allow for an infinite loop to occur when assert statements are bypassed, resulting in a DoS attack when processing a POST body. If optimizations are enabled (-O or PYTHONOPTIMIZE=1), and the application includes a handler that uses the Request.post() method, then an attacker may be able to execute a DoS attack with a specially crafted message. This issue is fixed in version 3.13.3.
Scope: local
bookworm: open
bullseye: open
forky: resolved (fixed in 3.13.3-1)
sid: resolved (fixed in 3.13.3-1)
trixie: open
No detection rules found.
No public exploits indexed.
Wiz
CVE-2025-69227 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 6.6
CVE-2025-69227 [MEDIUM] CVE-2025-69227 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2025-69227 :
Wolfi vulnerability analysis and mitigation
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below allow for an infinite loop to occur when assert statements are bypassed, resulting in a DoS attack when processing a POST body. If optimizations are enabled (-O or PYTHONOPTIMIZE=1), and the application includes a handler that uses the Request.post() method, then an attacker may be able to execute a DoS attack with a specially crafted message. This issue is fixed in version 3.13.3.
Source : NVD
## 6.6
Score
Published January 6, 2026
Severity MEDIUM
CNA Score 6.6
Affected Technologies
Wolfi
Chainguard
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation
Bugzilla
CVE-2025-69227 aiohttp: aiohttp: Denial of Service via specially crafted POST request
bugzilla·2026-01-06·CVSS 6.6
CVE-2025-69227 [MEDIUM] CVE-2025-69227 aiohttp: aiohttp: Denial of Service via specially crafted POST request
CVE-2025-69227 aiohttp: aiohttp: Denial of Service via specially crafted POST request
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Versions 3.13.2 and below allow for an infinite loop to occur when assert statements are bypassed, resulting in a DoS attack when processing a POST body. If optimizations are enabled (-O or PYTHONOPTIMIZE=1), and the application includes a handler that uses the Request.post() method, then an attacker may be able to execute a DoS attack with a specially crafted message. This issue is fixed in version 3.13.3.
2026-01-06
Published