Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
aiohttp versions before 3.14.0 are vulnerable to arbitrary code execution when CookieJar.load() is given untrusted input. The source says exploitation requires the application to load attacker-controlled files, which most applications do not do, since they load only their own data. Upgrade to aiohttp 3.14.0 or later. On older releases, sanitise any files before loading them with CookieJar.load().
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 6.4 | Medium | 3.1 | CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:L/I:H/A:L | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0018, the 7th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 2 Jun 2026, 12:26 UTC Published by the maintainers as a GitHub repository advisory
- 31 Oct 2026, 14:11 UTC First seen by agentprime
- 31 Oct 2026, 14:11 UTC Confirmed by OSV