CVE-2026-34525

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...

CVE-2026-34518

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, when following redirects to a different origin, aiohttp drops the Authorization header, but retains the Cookie and Proxy-Authorization headers. This issue has been patched in version 3.13.4...

AZL-81776 CVE-2026-34519 affecting package python-aiohttp 3.6.2-3

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, an attacker who controls the reason parameter when creating a Response may be able to inject extra headers or similar exploits. This issue has been patched in version 3.13.4...

AZL-81782 CVE-2026-34525 affecting package python-aiohttp 3.6.2-3

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...

guillotina-s3storage (>=1.0.31, <=1.0.34) potentially affected by CVE-2026-34520 via aiohttp (2.3.0a4)

aiohttp PYPI version 2.3.0a4 is affected by a known vulnerability. The following packages have a transitive dependency on aiohttp and may be impacted: - guillotina-s3storage =1.0.31, =1.0.34 Source cves: CVE-2026-34520 Source advisory: OSV:PYSEC-2026-2102...

homeassistant (>=0.36.0, <=0.37.1), hypr (0.8.2) +3 more potentially affected by CVE-2026-34520 via aiohttp (1.2.0)

aiohttp PYPI version 1.2.0 is affected by a known vulnerability. The following packages have a transitive dependency on aiohttp and may be impacted: - homeassistant =0.36.0, =0.1.0, =0.1.0, =1.5.9, =1.5.12 Source cves: CVE-2026-34520 Source advisory: OSV:PYSEC-2026-2102...

appdaemon (>=3.0.0b2, <=3.0.0b3), balebot (>=1.2.3, <=1.8.15) +4 more potentially affected by CVE-2026-34520 via aiohttp (2.3.7)

aiohttp PYPI version 2.3.7 is affected by a known vulnerability. The following packages have a transitive dependency on aiohttp and may be impacted: - appdaemon =3.0.0b2, =1.2.3, =0.61.1, =0.0.1, =0.2.1 - tictax 0.1.3 Source cves: CVE-2026-34520 Source advisory: OSV:PYSEC-2026-2102...

muffin (>=0.0.98, <=0.0.104) potentially affected by CVE-2026-34520 via aiohttp (0.16.6)

aiohttp PYPI version 0.16.6 is affected by a known vulnerability. The following packages have a transitive dependency on aiohttp and may be impacted: - muffin =0.0.98, =0.0.104 Source cves: CVE-2026-34520 Source advisory: OSV:PYSEC-2026-2102...

polyswarm-api (>=0.1.0, <=0.2.2), polyswarm-client (>=1.0.0rc0, <=1.0.2) +1 more potentially affected by CVE-2026-34520 via aiohttp (2.3.1)

aiohttp PYPI version 2.3.1 is affected by a known vulnerability. The following packages have a transitive dependency on aiohttp and may be impacted: - polyswarm-api =0.1.0, =1.0.0rc0, =0.2.0a7, =0.2.0a10 Source cves: CVE-2026-34520 Source advisory: OSV:PYSEC-2026-2102...

muffin (>=0.4.0, <=0.4.2) potentially affected by CVE-2026-34520 via aiohttp (0.19.0)

aiohttp PYPI version 0.19.0 is affected by a known vulnerability. The following packages have a transitive dependency on aiohttp and may be impacted: - muffin =0.4.0, =0.4.2 Source cves: CVE-2026-34520 Source advisory: OSV:PYSEC-2026-2102...

muffin (>=0.0.2, <=0.0.22) potentially affected by CVE-2026-34520 via aiohttp (0.14.1)

aiohttp PYPI version 0.14.1 is affected by a known vulnerability. The following packages have a transitive dependency on aiohttp and may be impacted: - muffin =0.0.2, =0.0.22 Source cves: CVE-2026-34520 Source advisory: OSV:PYSEC-2026-2102...

goblin (1.0.0b1) potentially affected by CVE-2026-34520 via aiohttp (0.22.1)

aiohttp PYPI version 0.22.1 is affected by a known vulnerability. The following packages have a transitive dependency on aiohttp and may be impacted: - goblin 1.0.0b1 Source cves: CVE-2026-34520 Source advisory: OSV:PYSEC-2026-2102...

hassmart-homeassistant (0.60.0), homeassistant (>=0.60.0, <=0.60.1) +2 more potentially affected by CVE-2026-34520 via aiohttp (2.3.6)

aiohttp PYPI version 2.3.6 is affected by a known vulnerability. The following packages have a transitive dependency on aiohttp and may be impacted: - hassmart-homeassistant 0.60.0 - homeassistant =0.60.0, =0.60.1 - pyplanet 0.5.4 - reliz 0.1.0.dev0 Source cves: CVE-2026-34520 Source advisory:...

muffin (>=0.3.0, <=0.3.2) potentially affected by CVE-2026-34520 via aiohttp (0.18.3)

aiohttp PYPI version 0.18.3 is affected by a known vulnerability. The following packages have a transitive dependency on aiohttp and may be impacted: - muffin =0.3.0, =0.3.2 Source cves: CVE-2026-34520 Source advisory: OSV:PYSEC-2026-2102...

muffin (>=0.1.5, <=0.1.6) potentially affected by CVE-2026-34520 via aiohttp (0.17.3)

aiohttp PYPI version 0.17.3 is affected by a known vulnerability. The following packages have a transitive dependency on aiohttp and may be impacted: - muffin =0.1.5, =0.1.6 Source cves: CVE-2026-34520 Source advisory: OSV:PYSEC-2026-2102...

muffin (>=0.3.3, <=0.3.7) potentially affected by CVE-2026-34520 via aiohttp (0.18.4)

aiohttp PYPI version 0.18.4 is affected by a known vulnerability. The following packages have a transitive dependency on aiohttp and may be impacted: - muffin =0.3.3, =0.3.7 Source cves: CVE-2026-34520 Source advisory: OSV:PYSEC-2026-2102...

PYSEC-2026-2102

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.13.4, the C parser the default for most installs accepted null bytes and control characters in response headers. This issue has been patched in version 3.13.4...

homeassistant (>=0.42.0, <=0.42.3) potentially affected by CVE-2026-34520 via aiohttp (2.0.5)

aiohttp PYPI version 2.0.5 is affected by a known vulnerability. The following packages have a transitive dependency on aiohttp and may be impacted: - homeassistant =0.42.0, =0.42.3 Source cves: CVE-2026-34520 Source advisory: OSV:PYSEC-2026-2102...

duniterpy (0.40.8), jenkins-epo (>=1.159.0, <=1.160.0) potentially affected by CVE-2026-34520 via aiohttp (2.0.0rc1)

aiohttp PYPI version 2.0.0rc1 is affected by a known vulnerability. The following packages have a transitive dependency on aiohttp and may be impacted: - duniterpy 0.40.8 - jenkins-epo =1.159.0, =1.160.0 Source cves: CVE-2026-34520 Source advisory: OSV:PYSEC-2026-2102...

homeassistant (>=0.38.0, <=0.38.4), okami (>=0.1.2, <=0.1.3) +1 more potentially affected by CVE-2026-34520 via aiohttp (1.3.1)

aiohttp PYPI version 1.3.1 is affected by a known vulnerability. The following packages have a transitive dependency on aiohttp and may be impacted: - homeassistant =0.38.0, =0.1.2, =0.1.3 - pyatv 0.1.4 Source cves: CVE-2026-34520 Source advisory: OSV:PYSEC-2026-2102...