CVE-2026-54277
CVE-2026-54277 · AIOHTTP: C HTTP Parser Bypasses max_line_size for Fragmented Lines
This page contains facts from public vulnerability sources. Check the original advisory before updating.
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, it is possible to bypass the max_line_size check in parts of an HTTP request in the C parser. If using the optimised C parser (the default in pre-built wheels), then an attacker may be able to send oversized lines through the HTTP parser and use an excessive amount of memory, potentially leading to DoS. This vulnerability is fixed in 3.14.1.
CVSS 6.6 · Medium · EPSS 0.6% · Fix available
- Published
- Updated
Affected products and versions
aiohttp
- Versions
- < 3.14.1: Affected
No fix published
python-aiohttp Debian:12
- Versions
- 3.10.0-1
- 3.10.1-1
- 3.10.10-1
- 3.10.10-2
- 3.10.11-1
- 3.10.3-1
- 3.10.3-2
- 3.10.3-3
- 3.10.4-1
- 3.10.5-1
- 3.10.6-1
- 3.10.8-1
- 3.11.15-1
- 3.11.16-1
- 3.12.15-1
- 3.13.0-1
- 3.13.1-1
- 3.13.3-1
- 3.13.3-2
- 3.13.3-3
- 3.13.5-1
- 3.14.0-1
- 3.14.1-1
- 3.14.1-2
- 3.14.1-3
- 3.14.1-4
- 3.14.1-5
- 3.14.3-1
- 3.8.4-1
- 3.8.4-1+deb12u1
- 3.8.5-1
- 3.8.6-1
- 3.9.1-1
- 3.9.5-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-aiohttp Debian:13
- Versions
- 3.11.16-1
- 3.11.16-1+deb13u1
- 3.12.15-1
- 3.13.0-1
- 3.13.1-1
- 3.13.3-1
- 3.13.3-2
- 3.13.3-3
- 3.13.5-1
- 3.14.0-1
- 3.14.1-1
- 3.14.1-2
- 3.14.1-3
- 3.14.1-4
- 3.14.1-5
- 3.14.3-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-aiohttp Debian:14
- Versions
- 3.11.16-1
- 3.12.15-1
- 3.13.0-1
- 3.13.1-1
- 3.13.3-1
- 3.13.3-2
- 3.13.3-3
- 3.13.5-1
- 3.14.0-1
- Affected ranges
- ECOSYSTEM: < 3.14.1-1
Update to 3.14.1-1
aiohttp PyPI
- Versions
- 0.1
- 0.10.0
- 0.10.1
- 0.10.2
- 0.11.0
- 0.12.0
- 0.13.0
- 0.13.1
- 0.14.0
- 0.14.1
- 0.14.2
- 0.14.3
- 0.14.4
- 0.15.0
- 0.15.1
- 0.15.2
- 0.15.3
- 0.16.0
- 0.16.1
- 0.16.2
- 0.16.3
- 0.16.4
- 0.16.5
- 0.16.6
- 0.17.0
- 0.17.1
- 0.17.2
- 0.17.3
- 0.17.4
- 0.18.0
- 0.18.1
- 0.18.2
- 0.18.3
- 0.18.4
- 0.19.0
- 0.2
- 0.20.0
- 0.20.1
- 0.20.2
- 0.21.0
- 0.21.1
- 0.21.2
- 0.21.4
- 0.21.5
- 0.21.6
- 0.22.0
- 0.22.0a0
- 0.22.0b0
- 0.22.0b1
- 0.22.0b2
- 0.22.0b3
- 0.22.0b4
- 0.22.0b5
- 0.22.0b6
- 0.22.1
- 0.22.2
- 0.22.3
- 0.22.4
- 0.22.5
- 0.3
- 0.4
- 0.4.1
- 0.4.2
- 0.4.3
- 0.4.4
- 0.5.0
- 0.6.0
- 0.6.1
- 0.6.2
- 0.6.3
- 0.6.4
- 0.6.5
- 0.7.0
- 0.7.1
- 0.7.2
- 0.7.3
- 0.8.0
- 0.8.1
- 0.8.2
- 0.8.3
- 0.8.4
- 0.9.0
- 0.9.1
- 0.9.2
- 0.9.3
- 1.0.0
- 1.0.1
- 1.0.2
- 1.0.3
- 1.0.5
- 1.1.0
- 1.1.1
- 1.1.2
- 1.1.3
- 1.1.4
- 1.1.5
- 1.1.6
- 1.2.0
- 1.3.0
- 1.3.1
- 1.3.2
- 1.3.3
- 1.3.4
- 1.3.5
- 2.0.0
- 2.0.0rc1
- 2.0.1
- 2.0.2
- 2.0.3
- 2.0.4
- 2.0.5
- 2.0.6
- 2.0.7
- 2.1.0
- 2.2.0
- 2.2.1
- 2.2.2
- 2.2.3
- 2.2.4
- 2.2.5
- 2.3.0
- 2.3.0a1
- 2.3.0a2
- 2.3.0a3
- 2.3.0a4
- 2.3.1
- 2.3.10
- 2.3.1a1
- 2.3.2
- 2.3.2b2
- 2.3.2b3
- 2.3.3
- 2.3.4
- 2.3.5
- 2.3.6
- 2.3.7
- 2.3.8
- 2.3.9
- 3.0.0
- 3.0.0b0
- 3.0.0b1
- 3.0.0b2
- 3.0.0b3
- 3.0.0b4
- 3.0.1
- 3.0.2
- 3.0.3
- 3.0.4
- 3.0.5
- 3.0.6
- 3.0.7
- 3.0.8
- 3.0.9
- 3.1.0
- 3.1.1
- 3.1.2
- 3.1.3
- 3.10.0
- 3.10.0b1
- 3.10.0rc0
- 3.10.1
- 3.10.10
- 3.10.11
- 3.10.11rc0
- 3.10.2
- 3.10.3
- 3.10.4
- 3.10.5
- 3.10.6
- 3.10.6rc0
- 3.10.6rc1
- 3.10.6rc2
- 3.10.7
- 3.10.8
- 3.10.9
- 3.11.0
- 3.11.0b0
- 3.11.0b1
- 3.11.0b2
- 3.11.0b3
- 3.11.0b4
- 3.11.0b5
- 3.11.0rc0
- 3.11.0rc1
- 3.11.0rc2
- 3.11.1
- 3.11.10
- 3.11.11
- 3.11.12
- 3.11.13
- 3.11.14
- 3.11.15
- 3.11.16
- 3.11.17
- 3.11.18
- 3.11.2
- 3.11.3
- 3.11.4
- 3.11.5
- 3.11.6
- 3.11.7
- 3.11.8
- 3.11.9
- 3.12.0
- 3.12.0b0
- 3.12.0b1
- 3.12.0b2
- 3.12.0b3
- 3.12.0rc0
- 3.12.0rc1
- 3.12.1
- 3.12.10
- 3.12.11
- 3.12.12
- 3.12.13
- 3.12.14
- 3.12.15
- 3.12.1rc0
- 3.12.2
- 3.12.3
- 3.12.4
- 3.12.6
- 3.12.7
- 3.12.7rc0
- 3.12.8
- 3.12.9
- 3.13.0
- 3.13.1
- 3.13.2
- 3.13.3
- 3.13.4
- 3.13.5
- 3.14.0
- 3.2.0
- 3.2.1
- 3.3.0
- 3.3.0a0
- 3.3.1
- 3.3.2
- 3.3.2a0
- 3.4.0
- 3.4.0a0
- 3.4.0a3
- 3.4.0b1
- 3.4.0b2
- 3.4.1
- 3.4.2
- 3.4.3
- 3.4.4
- 3.5.0
- 3.5.0a1
- 3.5.0b1
- 3.5.0b2
- 3.5.0b3
- 3.5.1
- 3.5.2
- 3.5.3
- 3.5.4
- 3.6.0
- 3.6.0a0
- 3.6.0a1
- 3.6.0a11
- 3.6.0a12
- 3.6.0a2
- 3.6.0a3
- 3.6.0a4
- 3.6.0a5
- 3.6.0a6
- 3.6.0a7
- 3.6.0a8
- 3.6.0a9
- 3.6.0b0
- 3.6.1
- 3.6.1b3
- 3.6.1b4
- 3.6.2
- 3.6.2a0
- 3.6.2a1
- 3.6.2a2
- 3.6.3
- 3.7.0
- 3.7.0b0
- 3.7.0b1
- 3.7.1
- 3.7.2
- 3.7.3
- 3.7.4
- 3.7.4.post0
- 3.8.0
- 3.8.0a7
- 3.8.0b0
- 3.8.1
- 3.8.2
- 3.8.3
- 3.8.4
- 3.8.5
- 3.8.6
- 3.9.0
- 3.9.0b0
- 3.9.0b1
- 3.9.0rc0
- 3.9.1
- 3.9.2
- 3.9.3
- 3.9.4
- 3.9.4rc0
- 3.9.5
- Affected ranges
- ECOSYSTEM: < 3.14.1
Update to 3.14.1
python-aiohttp Ubuntu:Pro:16.04:LTS
- Versions
- 0.17.2-1
- 0.17.4-1
- 0.17.4-1build1
- 0.20.2-1
- 0.20.2-1ubuntu0.1~esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-aiohttp Ubuntu:Pro:18.04:LTS
- Versions
- 2.2.3-1build1
- 2.2.3-2
- 2.3.6-1
- 3.0.1-1
- 3.0.1-1ubuntu0.1~esm1
- 3.0.1-1ubuntu0.1~esm4
- 3.0.1-1ubuntu0.1~esm5
- 3.0.1-1ubuntu0.1~esm6
- 3.0.1-1ubuntu0.1~esm7
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-aiohttp Ubuntu:Pro:20.04:LTS
- Versions
- 3.5.4-1
- 3.5.4-1build1
- 3.6.1-1
- 3.6.2-1
- 3.6.2-1build1
- 3.6.2-1ubuntu0.1~esm1
- 3.6.2-1ubuntu1
- 3.6.2-1ubuntu1+esm1
- 3.6.2-1ubuntu1+esm3
- 3.6.2-1ubuntu1+esm4
- 3.6.2-1ubuntu1+esm5
- 3.6.2-1ubuntu1+esm6
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-aiohttp Ubuntu:Pro:22.04:LTS
- Versions
- 3.7.4-1
- 3.7.4-1build2
- 3.8.1-3
- 3.8.1-4
- 3.8.1-4build1
- 3.8.1-4ubuntu0.2
- 3.8.1-4ubuntu0.2+esm1
- 3.8.1-4ubuntu0.2+esm2
- 3.8.1-4ubuntu0.2+esm3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-aiohttp Ubuntu:Pro:24.04:LTS
- Versions
- 3.8.4-1
- 3.9.1-1
- 3.9.1-1build1
- 3.9.1-1ubuntu0.1
- 3.9.1-1ubuntu0.1+esm1
- 3.9.1-1ubuntu0.1+esm2
- 3.9.1-1ubuntu0.1+esm3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-aiohttp Ubuntu:25.10
- Versions
- 3.10.11-1build1
- 3.11.16-1
- 3.11.16-1ubuntu0.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-aiohttp Ubuntu:26.10
- Versions
- 3.13.3-3ubuntu1
- 3.14.1-4
- 3.14.1-5
- 3.14.3-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-aiohttp Ubuntu:Pro:26.04:LTS
- Versions
- 3.11.16-1
- 3.13.1-1
- 3.13.3-3
- 3.13.3-3ubuntu1
- 3.13.3-3ubuntu1+esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published