CVE-2026-54279: aiohttp: Host-Only Cookies Become Domain Cookies After CookieJar Persistence

June 15, 2026

Host-only cookies that are saved with CookieJar.save() and then restored later with CookieJar.load() lose their host-only status.

References

github.com/advisories/GHSA-2fqr-mr3j-6wp8
github.com/aio-libs/aiohttp/security/advisories/GHSA-2fqr-mr3j-6wp8
nvd.nist.gov/vuln/detail/CVE-2026-54279

Code Behaviors & Features

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