CVE catalog
CVE-2026-59881
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-def
- Severity
- Medium · CVSS 6.9
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/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 - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.52% · Oct 25, 2026
AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.2, the WebSocket client accepts and decompresses frames with the RSV1 bit set even when the permessage-deflate extension was not negotiated, allowing a malicious server to cause unexpected CPU and memory consumption. This issue is fixed in version 3.14.2.
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 |
| Pip | aiohttp | Not reported | 3.14.2 | fixed |
| PyPI | aiohttp | Not reported | 3.14.2 | fixed |
| PyPI | aiohttp | Not reported | 3.14.2 | fixed |
| Suse | python-aiohttp | linux enterprise server 16.0 | 3.11.16-160000.7.1 | fixed |
| Suse | python-aiohttp | linux enterprise server for sap applications 16.0 | 3.11.16-160000.7.1 | fixed |
| Suse | python-aiohttp | linux enterprise module for public cloud 15 sp4 | 3.6.0-150100.3.41.1 | fixed |
| Suse | python-aiohttp | linux enterprise module for public cloud 15 sp5 | 3.6.0-150100.3.41.1 | fixed |
| Suse | python-aiohttp | linux enterprise module for public cloud 15 sp6 | 3.6.0-150100.3.41.1 | fixed |
| Suse | python-aiohttp | linux enterprise module for public cloud 15 sp7 | 3.6.0-150100.3.41.1 | fixed |
| Suse | python-aiohttp | linux enterprise module for public cloud 15 sp4 | 3.9.3-150400.10.46.1 | fixed |
| Suse | python-aiohttp | linux enterprise module for python 3 15 sp7 | 3.9.3-150400.10.46.1 | fixed |
| Opensuse | python-aiohttp | leap 16.0 | 3.11.16-160000.7.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | python-aiohttp | source | sid | 3.14.3-1 | not yet assigned | Not reported | [1143160] |
| Debian | python-aiohttp | source | forky | 3.14.3-1 | not yet assigned | Not reported | [1143160] |
| Debian | python-aiohttp | source | trixie | (unfixed) | not yet assigned | Not reported | [1143160] |
| Debian | python-aiohttp | source | bookworm | (unfixed) | not yet assigned | Not reported | [1143160] |
| Pip | aiohttp | pip | Not reported | 3.14.2 | Not reported | Not reported | Not reported |
| PyPI | aiohttp | PyPI | Not reported | 3.14.2 | Not reported | PYSEC-2026-3547 | Not reported |
| PyPI | aiohttp | PyPI | Not reported | 3.14.2 | Not reported | GHSA-MQ44-7P77-Q5H7 | Not reported |
| Suse | python-aiohttp | rpm | linux enterprise server 16.0 | 3.11.16-160000.7.1 | Not reported | SUSE-SU-2026:23571-1 | Not reported |
| Suse | python-aiohttp | rpm | linux enterprise server for sap applications 16.0 | 3.11.16-160000.7.1 | Not reported | SUSE-SU-2026:23571-1 | Not reported |
| Suse | python-aiohttp | rpm | linux enterprise module for public cloud 15 sp4 | 3.6.0-150100.3.41.1 | Not reported | SUSE-SU-2026:4113-1 | Not reported |
| Suse | python-aiohttp | rpm | linux enterprise module for public cloud 15 sp5 | 3.6.0-150100.3.41.1 | Not reported | SUSE-SU-2026:4113-1 | Not reported |
| Suse | python-aiohttp | rpm | linux enterprise module for public cloud 15 sp6 | 3.6.0-150100.3.41.1 | Not reported | SUSE-SU-2026:4113-1 | Not reported |
| Suse | python-aiohttp | rpm | linux enterprise module for public cloud 15 sp7 | 3.6.0-150100.3.41.1 | Not reported | SUSE-SU-2026:4113-1 | Not reported |
| Suse | python-aiohttp | rpm | linux enterprise module for public cloud 15 sp4 | 3.9.3-150400.10.46.1 | Not reported | SUSE-SU-2026:4031-1 | Not reported |
| Suse | python-aiohttp | rpm | linux enterprise module for python 3 15 sp7 | 3.9.3-150400.10.46.1 | Not reported | SUSE-SU-2026:4031-1 | Not reported |
| Opensuse | python-aiohttp | rpm | leap 16.0 | 3.11.16-160000.7.1 | Not reported | OPENSUSE-SU-2026:21687-1 | Not reported |
Notes
[trixie] 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 · bookwormAffected
nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
3.8.4-1+deb12u1· arm64 · bookwormAffected
nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
3.8.4-1+deb12u1· amd64 · bookworm-securityAffected
nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
3.8.4-1+deb12u1· arm64 · bookworm-securityAffected
nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
- [python-aiohttp-doc]Affected
Source package: [python-aiohttp]
Details (4)
3.8.4-1+deb12u1· all · bookwormAffected
nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
3.8.4-1+deb12u1· all · bookwormAffected
nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
3.8.4-1+deb12u1· all · bookworm-securityAffected
nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
3.8.4-1+deb12u1· all · bookworm-securityAffected
nvd · python-aiohttp · debian · bookworm; nvd · python-aiohttp · debian · 12
[Debian 13 (Trixie)]
- [python3-aiohttp]Affected
Source package: [python-aiohttp]
Details (4)
3.11.16-1+deb13u1· amd64 · trixieAffected
nvd · python-aiohttp · debian · 13
3.11.16-1+deb13u1· arm64 · trixieAffected
nvd · python-aiohttp · debian · 13
3.11.16-1+deb13u1· amd64 · trixie-securityAffected
nvd · python-aiohttp · debian · 13
3.11.16-1+deb13u1· arm64 · trixie-securityAffected
nvd · python-aiohttp · debian · 13
- [python-aiohttp-doc]Affected
Source package: [python-aiohttp]
Details (4)
3.11.16-1+deb13u1· all · trixieAffected
nvd · python-aiohttp · debian · 13
3.11.16-1+deb13u1· all · trixieAffected
nvd · python-aiohttp · debian · 13
3.11.16-1+deb13u1· all · trixie-securityAffected
nvd · python-aiohttp · debian · 13
3.11.16-1+deb13u1· all · trixie-securityAffected
nvd · python-aiohttp · debian · 13
Observed:
References
- [http://github.com/aio-libs/aiohttp/releases/tag/v3.14.2]
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11467-1.json]
- [https://github.com/aio-libs/aiohttp/commit/47fb6ae354d4fa22048f4dbe7dbf82b625f0a2f6]
- [https://github.com/aio-libs/aiohttp/pull/12978]
- [https://github.com/aio-libs/aiohttp/security/advisories/GHSA-mq44-7p77-q5h7]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-59881]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-59881]
- [https://osv.dev/vulnerability/GHSA-mq44-7p77-q5h7]
- [https://osv.dev/vulnerability/SUSE-SU-2026:23571-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:4031-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:4113-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:21687-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-59881]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59881.json]
[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]