CVE-2026-54279
published 2026-06-22CVE-2026-54279: AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, host-only cookies that are saved with CookieJar.save() and…
PriorityP339high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.28%
19.8th percentile
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, host-only cookies that are saved with CookieJar.save() and then restored later with CookieJar.load() lose their host-only status. This vulnerability is fixed in 3.14.1.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| aio-libs | aiohttp | < 3.14.1 | 3.14.1 |
| aiohttp | aiohttp | < 3.14.1 | 3.14.1 |
| aiohttp | aiohttp | >= 0 < 3.14.1 | 3.14.1 |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv4.01.3LOWCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat1.3LOW
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VulDB
aio-libs aiohttp up to 3.14.0 CookieJar.save initialization (GHSA-2fqr-mr3j-6wp8 / EUVD-2026-38310)
vuldb·2026-06-22·CVSS 1.3
CVE-2026-54279 [LOW] aio-libs aiohttp up to 3.14.0 CookieJar.save initialization (GHSA-2fqr-mr3j-6wp8 / EUVD-2026-38310)
A vulnerability, which was classified as problematic, was found in aio-libs aiohttp up to 3.14.0. The affected element is the function CookieJar.save. Such manipulation leads to improper initialization.
This vulnerability is uniquely identified as CVE-2026-54279. The attack can be launched remotely. No exploit exists.
You should upgrade the affected component.
GHSA
aiohttp: Host-Only Cookies Become Domain Cookies After CookieJar Persistence
ghsa·2026-06-15
CVE-2026-54279 [LOW] CWE-665 aiohttp: Host-Only Cookies Become Domain Cookies After CookieJar Persistence
aiohttp: Host-Only Cookies Become Domain Cookies After CookieJar Persistence
### Summary
Host-only cookies that are saved with ``CookieJar.save()`` and then restored later with ``CookieJar.load()`` lose their host-only status.
### Impact
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
Red Hat
aiohttp: AIOHTTP: Host-Only Cookies Become Domain Cookies After CookieJar Persistence
vendor_redhat·2026-06-22·CVSS 1.3
CVE-2026-54279 [LOW] CWE-565 aiohttp: AIOHTTP: Host-Only Cookies Become Domain Cookies After CookieJar Persistence
aiohttp: AIOHTTP: Host-Only Cookies Become Domain Cookies After CookieJar Persistence
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, host-only cookies that are saved with CookieJar.save() and then restored later with CookieJar.load() lose their host-only status. This vulnerability is fixed in 3.14.1.
A flaw was found in aiohttp (before 3.14.1). Host-only cookies saved with CookieJar.save() and later restored with CookieJar.load() lose their host-only flag, so cookies intended for a single host may be sent to subdomains after persistence.
Statement: aiohttp is vulnerable to improper cookie scope handling when persisting and reloading CookieJar data. After save/load, host-only cookies are treated as domain cookies, so session data meant fo
No detection rules found.
No public exploits indexed.
2026-06-22
Published