CVE catalog

CVE-2025-53643

python-aiohttp: CVE-2025-53643

Severity: Low · CVSS 3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Published: Jul 14, 2025, 7:33:31 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.36% · Oct 27, 2026

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.12.14, the Python parser is vulnerable to a request smuggling vulnerability due to not parsing trailer sections of an HTTP request. If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or AIOHTTP_NO_EXTENSIONS is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. Version 3.12.14 contains a patch for this issue.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	python-aiohttp	sid	`3.14.3-1`	fixed
Debian	python-aiohttp	forky	`3.14.3-1`	fixed
Debian	python-aiohttp	trixie	`3.11.16-1+deb13u1`	vulnerable
Debian	python-aiohttp	trixie-security	`3.11.16-1+deb13u1`	vulnerable
Debian	python-aiohttp	bookworm	`3.8.4-1+deb12u1`	vulnerable
Debian	python-aiohttp	bookworm-security	`3.8.4-1+deb12u1`	vulnerable
PyPI	aiohttp	Not reported	`3.12.14`	fixed
Ubuntu	python-aiohttp	pro	`3.11.16-1`	vulnerable
Ubuntu	python-aiohttp	pro	`3.13.1-1`	vulnerable
Ubuntu	python-aiohttp	pro	`3.13.3-3`	vulnerable
Ubuntu	python-aiohttp	pro	`3.13.3-3ubuntu1`	vulnerable
Ubuntu	python-aiohttp	pro	`3.13.3-3ubuntu1+esm1`	vulnerable
Ubuntu	python-aiohttp	25.10	`3.10.11-1build1`	vulnerable
Ubuntu	python-aiohttp	25.10	`3.11.16-1`	vulnerable
Ubuntu	python-aiohttp	25.10	`3.11.16-1ubuntu0.1`	vulnerable
Opensuse	python-Brotli	leap 16.0	`1.1.0-160000.3.1`	fixed
Opensuse	python-aiohttp	leap 16.0	`3.11.16-160000.3.1`	fixed
Suse	python-Brotli	linux enterprise server 16.0	`1.1.0-160000.3.1`	fixed
Suse	python-aiohttp	linux enterprise server 16.0	`3.11.16-160000.3.1`	fixed
Suse	python-Brotli	linux enterprise server for sap applications 16.0	`1.1.0-160000.3.1`	fixed
Suse	python-aiohttp	linux enterprise server for sap applications 16.0	`3.11.16-160000.3.1`	fixed
Suse	python-aiohttp	linux enterprise module for public cloud 15 sp4	`3.9.3-150400.10.33.1`	fixed
Suse	python-aiohttp	linux enterprise module for python 3 15 sp6	`3.9.3-150400.10.33.1`	fixed
Suse	python-aiohttp	linux enterprise module for python 3 15 sp7	`3.9.3-150400.10.33.1`	fixed
Opensuse	python-aiohttp	leap 15.6	`3.9.3-150400.10.33.1`	fixed
Suse	python-aiohttp	linux enterprise module for public cloud 15 sp3	`3.6.0-150100.3.27.1`	fixed
Suse	python-aiohttp	linux enterprise module for public cloud 15 sp4	`3.6.0-150100.3.27.1`	fixed
Suse	python-aiohttp	linux enterprise module for public cloud 15 sp5	`3.6.0-150100.3.27.1`	fixed
Suse	python-aiohttp	linux enterprise module for public cloud 15 sp6	`3.6.0-150100.3.27.1`	fixed
Suse	python-aiohttp	linux enterprise module for public cloud 15 sp7	`3.6.0-150100.3.27.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	python-aiohttp	source	sid	`3.12.15-1`	not yet assigned	Not reported	[1109336]
Debian	python-aiohttp	source	forky	`3.12.15-1`	not yet assigned	Not reported	[1109336]
Debian	python-aiohttp	source	trixie	`(unfixed)`	not yet assigned	Not reported	[1109336]
Debian	python-aiohttp	source	bookworm	`(unfixed)`	not yet assigned	Not reported	[1109336]
PyPI	aiohttp	PyPI	Not reported	`3.12.14`	Not reported	GHSA-9548-QRRJ-X5PJ	Not reported
Opensuse	python-Brotli	rpm	leap 16.0	`1.1.0-160000.3.1`	Not reported	OPENSUSE-SU-2026:20204-1	Not reported
Opensuse	python-aiohttp	rpm	leap 16.0	`3.11.16-160000.3.1`	Not reported	OPENSUSE-SU-2026:20204-1	Not reported
Suse	python-Brotli	rpm	linux enterprise server 16.0	`1.1.0-160000.3.1`	Not reported	SUSE-SU-2026:20425-1	Not reported
Suse	python-aiohttp	rpm	linux enterprise server 16.0	`3.11.16-160000.3.1`	Not reported	SUSE-SU-2026:20425-1	Not reported
Suse	python-Brotli	rpm	linux enterprise server for sap applications 16.0	`1.1.0-160000.3.1`	Not reported	SUSE-SU-2026:20425-1	Not reported
Suse	python-aiohttp	rpm	linux enterprise server for sap applications 16.0	`3.11.16-160000.3.1`	Not reported	SUSE-SU-2026:20425-1	Not reported
Suse	python-aiohttp	rpm	linux enterprise module for public cloud 15 sp4	`3.9.3-150400.10.33.1`	Not reported	SUSE-SU-2025:03057-1	Not reported
Suse	python-aiohttp	rpm	linux enterprise module for python 3 15 sp6	`3.9.3-150400.10.33.1`	Not reported	SUSE-SU-2025:03057-1	Not reported
Suse	python-aiohttp	rpm	linux enterprise module for python 3 15 sp7	`3.9.3-150400.10.33.1`	Not reported	SUSE-SU-2025:03057-1	Not reported
Opensuse	python-aiohttp	rpm	leap 15.6	`3.9.3-150400.10.33.1`	Not reported	SUSE-SU-2025:03057-1	Not reported
Suse	python-aiohttp	rpm	linux enterprise module for public cloud 15 sp3	`3.6.0-150100.3.27.1`	Not reported	SUSE-SU-2025:03201-1	Not reported
Suse	python-aiohttp	rpm	linux enterprise module for public cloud 15 sp4	`3.6.0-150100.3.27.1`	Not reported	SUSE-SU-2025:03201-1	Not reported
Suse	python-aiohttp	rpm	linux enterprise module for public cloud 15 sp5	`3.6.0-150100.3.27.1`	Not reported	SUSE-SU-2025:03201-1	Not reported
Suse	python-aiohttp	rpm	linux enterprise module for public cloud 15 sp6	`3.6.0-150100.3.27.1`	Not reported	SUSE-SU-2025:03201-1	Not reported
Suse	python-aiohttp	rpm	linux enterprise module for public cloud 15 sp7	`3.6.0-150100.3.27.1`	Not reported	SUSE-SU-2025:03201-1	Not reported

[Debian bug #1109336]

Notes

[trixie] python-aiohttp: Minor issue [bookworm] python-aiohttp: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[python3-aiohttp]Affected
Source package: [python-aiohttp]
Details (4)
- 3.8.4-1+deb12u1 · amd64 · bookworm
  Affected
  dsa · python-aiohttp · debian · bookworm; dsa · python-aiohttp · debian · 12
- 3.8.4-1+deb12u1 · arm64 · bookworm
  Affected
  dsa · python-aiohttp · debian · bookworm; dsa · python-aiohttp · debian · 12
- 3.8.4-1+deb12u1 · amd64 · bookworm-security
  Affected
  dsa · python-aiohttp · debian · bookworm; dsa · python-aiohttp · debian · 12
- 3.8.4-1+deb12u1 · arm64 · bookworm-security
  Affected
  dsa · python-aiohttp · debian · bookworm; dsa · python-aiohttp · debian · 12
[python-aiohttp-doc]Affected
Source package: [python-aiohttp]
Details (4)
- 3.8.4-1+deb12u1 · all · bookworm
  Affected
  dsa · python-aiohttp · debian · bookworm; dsa · python-aiohttp · debian · 12
- 3.8.4-1+deb12u1 · all · bookworm
  Affected
  dsa · python-aiohttp · debian · bookworm; dsa · python-aiohttp · debian · 12
- 3.8.4-1+deb12u1 · all · bookworm-security
  Affected
  dsa · python-aiohttp · debian · bookworm; dsa · python-aiohttp · debian · 12
- 3.8.4-1+deb12u1 · all · bookworm-security
  Affected
  dsa · python-aiohttp · debian · bookworm; dsa · python-aiohttp · debian · 12

[Debian 13 (Trixie)]

[python3-aiohttp]Affected
Source package: [python-aiohttp]
Details (4)
- 3.11.16-1+deb13u1 · amd64 · trixie
  Affected
  dsa · python-aiohttp · debian · 13
- 3.11.16-1+deb13u1 · arm64 · trixie
  Affected
  dsa · python-aiohttp · debian · 13
- 3.11.16-1+deb13u1 · amd64 · trixie-security
  Affected
  dsa · python-aiohttp · debian · 13
- 3.11.16-1+deb13u1 · arm64 · trixie-security
  Affected
  dsa · python-aiohttp · debian · 13
[python-aiohttp-doc]Affected
Source package: [python-aiohttp]
Details (4)
- 3.11.16-1+deb13u1 · all · trixie
  Affected
  dsa · python-aiohttp · debian · 13
- 3.11.16-1+deb13u1 · all · trixie
  Affected
  dsa · python-aiohttp · debian · 13
- 3.11.16-1+deb13u1 · all · trixie-security
  Affected
  dsa · python-aiohttp · debian · 13
- 3.11.16-1+deb13u1 · all · trixie-security
  Affected
  dsa · python-aiohttp · debian · 13

Observed: Oct 27, 2026, 12:54:22 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]