CVE-2026-54279Low▾ Sunlitaiohttp: Host-Only Cookies Become Domain Cookies After CookieJar Persistence
▾ Sunlit zone — Low / medium · no exploitation signal
impact 13.8 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 30.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
0.3%
Last analysed / modified upstream
0.3% → 0.5%
Host-only cookies that are saved with CookieJar.save() and then restored later with CookieJar.load() lose their host-only status.
Host-only cookies that have been loaded from disk may get sent to subdomains that previously should have been disallowed.
Patch: https://github.com/aio-libs/aiohttp/commit/a329a7aacad5284f087af36103aff778746da0f2
aiohttp < 3.14.1Upgrade to a patched release:
aiohttp 3.14.1Connected by shared product, vendor, weakness, or advisory.
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