Summary
Cookies set with the cookies parameter on requests are sent after following a cross-origin redirect.
Workaround
If unable to upgrade, using a Cookie header in the headers parameter is not vulnerable.
Patch: https://github.com/aio-libs/aiohttp/commit/f54c40851b0d6c4bbdab97ba518a223adda32478
Impact
If a developer uses the cookies parameter on a per-request basis then sensitive data might be leaked to an attacker if they manage to control a redirect.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
Frequently Asked Questions
- What is CVE-2026-47265? CVE-2026-47265 is a medium-severity security vulnerability in aiohttp (pip), affecting versions < 3.14.0. It is fixed in 3.14.0.
- Which versions of aiohttp are affected by CVE-2026-47265? aiohttp (pip) versions < 3.14.0 is affected.
- Is there a fix for CVE-2026-47265? Yes. CVE-2026-47265 is fixed in 3.14.0. Upgrade to this version or later.
- Is CVE-2026-47265 exploitable, and should I be worried? Whether CVE-2026-47265 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-47265 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-47265? Upgrade
aiohttpto 3.14.0 or later.