CVE-2026-34525

EUVD-2026-18048
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, multiple Host headers were allowed in aiohttp. This issue has been patched in version 3.13.4.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 21.18%
Affected Products (NVD)
VendorProductVersion
aiohttpaiohttp
𝑥
< 3.13.4
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
python-aiohttp
bookworm
no-dsa
bookworm (security)
vulnerable
bullseye
vulnerable
bullseye (security)
3.7.4-1+deb11u2
fixed
forky
3.14.1-4
fixed
sid
3.14.1-4
fixed
trixie
no-dsa
trixie (security)
vulnerable
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
python-aiohttp
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
ignored
resolute
needs-triage
xenial
ignored
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
python3-aiohttp
suse enterprise sap 15 SP4
3.6.0-150100.3.35.1
fixed
suse enterprise server 15 SP4
3.6.0-150100.3.35.1
fixed
python311-aiohttp
suse enterprise sap 15 SP4
3.9.3-150400.10.43.1
fixed
suse enterprise server 15 SP4
3.9.3-150400.10.43.1
fixed
Common Weakness Enumeration
References
https://github.com/aio-libs/aiohttp/commit/53e2e6fc58b89c6185be7820bd2c9f40216b3000
https://github.com/aio-libs/aiohttp/commit/e00ca3cca92c465c7913c4beb763a72da9ed8349
https://github.com/aio-libs/aiohttp/releases/tag/v3.13.4
https://github.com/aio-libs/aiohttp/security/advisories/GHSA-c427-h43c-vf67