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CVE-2025-69230VulnerabilityPublished

CVE-2025-69230: aio-libs aiohttp · Logging of Excessive Data

Affects aio-libs aiohttpSource CVE Database V5

0

Not known to be exploited · CVSS 2.7 Low : upgrade to 3.13.3 when convenient.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 4.0 base score
2.7Low
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 29% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 3.13.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:U

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Jan 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

What to do

Upgrade aio-libs aiohttp to 3.13.3.

Affected software

ProductAffectedFixed in
aio-libsaiohttpAffected
  • <3.13.3
Fixed in
  • 3.13.3
PyPIaiohttppkg:pypi/aiohttpOther threatsAffected
  • <3.13.3
Fixed in
  • 3.13.3

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

European organizations should immediately upgrade aiohttp to version 3.13.3 or later to remediate this vulnerability. In addition, review and harden logging configurations to limit the volume and verbosity of logs generated by web frameworks, especially for warning-level messages. Implement rate limiting or filtering on incoming HTTP headers to detect and block suspicious or malformed Cookie headers that could trigger excessive logging. Enhance monitoring of log storage utilization and set alerts for abnormal increases in log volume. Consider deploying Web Application Firewalls (WAFs) to detect and block anomalous HTTP requests with malformed cookies. Conduct regular audits of third-party dependencies to ensure timely application of security patches. Finally, educate development teams on secure handling of HTTP headers and the importance of updating asynchronous frameworks promptly.

Description

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. In versions 3.13.2 and below, reading multiple invalid cookies can lead to a logging storm. If the cookies attribute is accessed in an application, then an attacker may be able to trigger a storm of warning-level logs using a specially crafted Cookie header. This issue is fixed in 3.13.3.

References

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