CVE catalog
CVE-2026-82397
Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.8, Tornado parses application/x-www-form-urlencoded request bodies with urllib.parse.parse_qs in tornado/escape.py w
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.35% · Oct 25, 2026
Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.8, Tornado parses application/x-www-form-urlencoded request bodies with urllib.parse.parse_qs in tornado/escape.py without passing max_num_fields. RequestHandler._execute in tornado/web.py parses the body before handler dispatch through HTTPServerRequest._parse_body and parse_body_arguments in tornado/httputil.py, so an unauthenticated request body containing millions of separator-delimited fields can synchronously stall the single-threaded event loop and delay every connection. The body is bounded only by max_buffer_size, which defaults to 104857600 bytes. This issue is fixed in version 6.5.8.
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-tornado | sid | 6.5.5-5 | vulnerable |
| Debian | python-tornado | forky | 6.5.5-5 | vulnerable |
| Debian | python-tornado | trixie | 6.4.2-3+deb13u2 | vulnerable |
| Debian | python-tornado | trixie-security | 6.4.2-3+deb13u2 | vulnerable |
| Debian | python-tornado | bookworm | 6.2.0-3+deb12u4 | vulnerable |
| Debian | python-tornado | bookworm-security | 6.2.0-3+deb12u4 | vulnerable |
| Pip | tornado | Not reported | 6.5.8 | fixed |
| Suse | python-tornado6 | linux micro 6.1 | 6.4-slfo.1.1_7.1 | fixed |
| Suse | python-tornado6 | linux enterprise module for python 3 15 sp7 | 6.3.2-150400.9.24.1 | fixed |
| Suse | python-tornado6 | linux enterprise high performance computing 15 sp4-espos | 6.3.2-150400.9.24.1 | fixed |
| Suse | python-tornado6 | linux enterprise high performance computing 15 sp4-ltss | 6.3.2-150400.9.24.1 | fixed |
| Suse | python-tornado6 | linux enterprise high performance computing 15 sp5-espos | 6.3.2-150400.9.24.1 | fixed |
| Suse | python-tornado6 | linux enterprise high performance computing 15 sp5-ltss | 6.3.2-150400.9.24.1 | fixed |
| Suse | python-tornado6 | linux enterprise server 15 sp4-ltss | 6.3.2-150400.9.24.1 | fixed |
| Suse | python-tornado6 | linux enterprise server 15 sp5-ltss | 6.3.2-150400.9.24.1 | fixed |
| Suse | python-tornado6 | linux enterprise server 15 sp6-ltss | 6.3.2-150400.9.24.1 | fixed |
| Suse | python-tornado6 | linux enterprise server for sap applications 15 sp4 | 6.3.2-150400.9.24.1 | fixed |
| Suse | python-tornado6 | linux enterprise server for sap applications 15 sp5 | 6.3.2-150400.9.24.1 | fixed |
| Suse | python-tornado6 | linux enterprise server for sap applications 15 sp6 | 6.3.2-150400.9.24.1 | fixed |
| Suse | python-tornado | linux enterprise micro 5.3 | 4.5.3-150000.3.28.1 | fixed |
| Suse | python-tornado | linux enterprise micro 5.4 | 4.5.3-150000.3.28.1 | fixed |
| Suse | python-tornado | linux enterprise micro 5.5 | 4.5.3-150000.3.28.1 | fixed |
| Suse | python-tornado | linux enterprise module for basesystem 15 sp7 | 4.5.3-150000.3.28.1 | fixed |
| Suse | python-tornado | linux enterprise high performance computing 15 sp4-espos | 4.5.3-150000.3.28.1 | fixed |
| Suse | python-tornado | linux enterprise high performance computing 15 sp4-ltss | 4.5.3-150000.3.28.1 | fixed |
| Suse | python-tornado | linux enterprise high performance computing 15 sp5-espos | 4.5.3-150000.3.28.1 | fixed |
| Suse | python-tornado | linux enterprise high performance computing 15 sp5-ltss | 4.5.3-150000.3.28.1 | fixed |
| Suse | python-tornado | linux enterprise server 15 sp4-ltss | 4.5.3-150000.3.28.1 | fixed |
| Suse | python-tornado | linux enterprise server 15 sp5-ltss | 4.5.3-150000.3.28.1 | fixed |
| Suse | python-tornado | linux enterprise server 15 sp6-ltss | 4.5.3-150000.3.28.1 | fixed |
| Suse | python-tornado | linux enterprise server for sap applications 15 sp4 | 4.5.3-150000.3.28.1 | fixed |
| Suse | python-tornado | linux enterprise server for sap applications 15 sp5 | 4.5.3-150000.3.28.1 | fixed |
| Suse | python-tornado | linux enterprise server for sap applications 15 sp6 | 4.5.3-150000.3.28.1 | fixed |
| Suse | python-tornado6 | linux enterprise server 16.0 | 6.5-160000.7.1 | fixed |
| Suse | python-tornado6 | linux enterprise server for sap applications 16.0 | 6.5-160000.7.1 | fixed |
| Opensuse | python-tornado6 | leap 16.0 | 6.5-160000.7.1 | fixed |
| Ubuntu | python-tornado | pro | 6.1.0-1build1 | vulnerable |
| Ubuntu | python-tornado | pro | 6.1.0-2 | vulnerable |
| Ubuntu | python-tornado | pro | 6.1.0-3 | vulnerable |
| Ubuntu | python-tornado | pro | 6.1.0-3build1 | vulnerable |
| Ubuntu | python-tornado | pro | 6.1.0-3ubuntu0.1~esm1 | vulnerable |
| Ubuntu | python-tornado | pro | 6.1.0-3ubuntu0.1~esm2 | vulnerable |
| Ubuntu | python-tornado | pro | 6.1.0-3ubuntu0.1~esm4 | vulnerable |
| Ubuntu | python-tornado | pro | 6.1.0-3ubuntu0.1~esm5 | vulnerable |
| Ubuntu | python-tornado | pro | 6.1.0-3ubuntu0.1~esm6 | vulnerable |
| Ubuntu | python-tornado | 24.04 | 6.3.2-1 | vulnerable |
| Ubuntu | python-tornado | 24.04 | 6.4.0-0ubuntu1 | vulnerable |
| Ubuntu | python-tornado | 24.04 | 6.4.0-1 | vulnerable |
| Ubuntu | python-tornado | 24.04 | 6.4.0-1build1 | vulnerable |
| Ubuntu | python-tornado | 24.04 | 6.4.0-1ubuntu0.1 | vulnerable |
| Ubuntu | python-tornado | 24.04 | 6.4.0-1ubuntu0.2 | vulnerable |
| Ubuntu | python-tornado | 24.04 | 6.4.0-1ubuntu0.4 | vulnerable |
| Ubuntu | python-tornado | 24.04 | 6.4.0-1ubuntu0.5 | vulnerable |
| Ubuntu | python-tornado | 24.04 | 6.4.0-1ubuntu0.6 | vulnerable |
| Ubuntu | python-tornado | 26.10 | 6.5.4-0.1 | vulnerable |
| Ubuntu | python-tornado | 26.10 | 6.5.5-2 | vulnerable |
| Ubuntu | python-tornado | 26.10 | 6.5.5-4 | vulnerable |
| Ubuntu | python-tornado | 26.10 | 6.5.5-5 | vulnerable |
| Ubuntu | python-tornado | 26.10 | 6.5.5-5ubuntu1.1 | vulnerable |
| Ubuntu | python-tornado | 26.04 | 6.4.2-3 | vulnerable |
| Ubuntu | python-tornado | 26.04 | 6.5.2-3 | vulnerable |
| Ubuntu | python-tornado | 26.04 | 6.5.4-0.1 | vulnerable |
| Ubuntu | python-tornado | 26.04 | 6.5.4-0.1ubuntu0.1 | vulnerable |
| Ubuntu | python-tornado | 26.04 | 6.5.4-0.1ubuntu0.2 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | python-tornado | source | sid | (unfixed) | not yet assigned | Not reported | [1146475] |
| Debian | python-tornado | source | forky | (unfixed) | not yet assigned | Not reported | [1146475] |
| Debian | python-tornado | source | trixie | (unfixed) | not yet assigned | Not reported | [1146475] |
| Debian | python-tornado | source | bookworm | (unfixed) | not yet assigned | Not reported | [1146475] |
| Pip | tornado | pip | Not reported | 6.5.8 | Not reported | GHSA-MPF4-983Q-P7J4 | Not reported |
| Suse | python-tornado6 | rpm | linux micro 6.1 | 6.4-slfo.1.1_7.1 | Not reported | SUSE-SU-2026:23523-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise module for python 3 15 sp7 | 6.3.2-150400.9.24.1 | Not reported | SUSE-SU-2026:4076-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise high performance computing 15 sp4-espos | 6.3.2-150400.9.24.1 | Not reported | SUSE-SU-2026:4076-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise high performance computing 15 sp4-ltss | 6.3.2-150400.9.24.1 | Not reported | SUSE-SU-2026:4076-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise high performance computing 15 sp5-espos | 6.3.2-150400.9.24.1 | Not reported | SUSE-SU-2026:4076-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise high performance computing 15 sp5-ltss | 6.3.2-150400.9.24.1 | Not reported | SUSE-SU-2026:4076-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise server 15 sp4-ltss | 6.3.2-150400.9.24.1 | Not reported | SUSE-SU-2026:4076-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise server 15 sp5-ltss | 6.3.2-150400.9.24.1 | Not reported | SUSE-SU-2026:4076-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise server 15 sp6-ltss | 6.3.2-150400.9.24.1 | Not reported | SUSE-SU-2026:4076-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise server for sap applications 15 sp4 | 6.3.2-150400.9.24.1 | Not reported | SUSE-SU-2026:4076-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise server for sap applications 15 sp5 | 6.3.2-150400.9.24.1 | Not reported | SUSE-SU-2026:4076-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise server for sap applications 15 sp6 | 6.3.2-150400.9.24.1 | Not reported | SUSE-SU-2026:4076-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise micro 5.3 | 4.5.3-150000.3.28.1 | Not reported | SUSE-SU-2026:4073-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise micro 5.4 | 4.5.3-150000.3.28.1 | Not reported | SUSE-SU-2026:4073-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise micro 5.5 | 4.5.3-150000.3.28.1 | Not reported | SUSE-SU-2026:4073-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise module for basesystem 15 sp7 | 4.5.3-150000.3.28.1 | Not reported | SUSE-SU-2026:4073-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise high performance computing 15 sp4-espos | 4.5.3-150000.3.28.1 | Not reported | SUSE-SU-2026:4073-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise high performance computing 15 sp4-ltss | 4.5.3-150000.3.28.1 | Not reported | SUSE-SU-2026:4073-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise high performance computing 15 sp5-espos | 4.5.3-150000.3.28.1 | Not reported | SUSE-SU-2026:4073-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise high performance computing 15 sp5-ltss | 4.5.3-150000.3.28.1 | Not reported | SUSE-SU-2026:4073-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise server 15 sp4-ltss | 4.5.3-150000.3.28.1 | Not reported | SUSE-SU-2026:4073-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise server 15 sp5-ltss | 4.5.3-150000.3.28.1 | Not reported | SUSE-SU-2026:4073-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise server 15 sp6-ltss | 4.5.3-150000.3.28.1 | Not reported | SUSE-SU-2026:4073-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise server for sap applications 15 sp4 | 4.5.3-150000.3.28.1 | Not reported | SUSE-SU-2026:4073-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise server for sap applications 15 sp5 | 4.5.3-150000.3.28.1 | Not reported | SUSE-SU-2026:4073-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise server for sap applications 15 sp6 | 4.5.3-150000.3.28.1 | Not reported | SUSE-SU-2026:4073-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise server 16.0 | 6.5-160000.7.1 | Not reported | SUSE-SU-2026:24207-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise server for sap applications 16.0 | 6.5-160000.7.1 | Not reported | SUSE-SU-2026:24207-1 | Not reported |
| Opensuse | python-tornado6 | rpm | leap 16.0 | 6.5-160000.7.1 | Not reported | OPENSUSE-SU-2026:22059-1 | Not reported |
Notes
[trixie] python-tornado: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-tornado]Affected
Source package: [python-tornado]
Details (4)
6.2.0-3+deb12u4· amd64 · bookwormAffected
nvd · python-tornado · debian · bookworm; nvd · python-tornado · debian · 12
6.2.0-3+deb12u4· arm64 · bookwormAffected
nvd · python-tornado · debian · bookworm; nvd · python-tornado · debian · 12
6.2.0-3+deb12u4· amd64 · bookworm-securityAffected
nvd · python-tornado · debian · bookworm; nvd · python-tornado · debian · 12
6.2.0-3+deb12u4· arm64 · bookworm-securityAffected
nvd · python-tornado · debian · bookworm; nvd · python-tornado · debian · 12
- [python-tornado-doc]Affected
Source package: [python-tornado]
Details (4)
6.2.0-3+deb12u4· all · bookwormAffected
nvd · python-tornado · debian · bookworm; nvd · python-tornado · debian · 12
6.2.0-3+deb12u4· all · bookwormAffected
nvd · python-tornado · debian · bookworm; nvd · python-tornado · debian · 12
6.2.0-3+deb12u4· all · bookworm-securityAffected
nvd · python-tornado · debian · bookworm; nvd · python-tornado · debian · 12
6.2.0-3+deb12u4· all · bookworm-securityAffected
nvd · python-tornado · debian · bookworm; nvd · python-tornado · debian · 12
[Debian 13 (Trixie)]
- [python3-tornado]Affected
Source package: [python-tornado]
Details (4)
6.4.2-3+deb13u2· amd64 · trixieAffected
nvd · python-tornado · debian · 13
6.4.2-3+deb13u2· arm64 · trixieAffected
nvd · python-tornado · debian · 13
6.4.2-3+deb13u2· amd64 · trixie-securityAffected
nvd · python-tornado · debian · 13
6.4.2-3+deb13u2· arm64 · trixie-securityAffected
nvd · python-tornado · debian · 13
- [python-tornado-doc]Affected
Source package: [python-tornado]
Details (4)
6.4.2-3+deb13u2· all · trixieAffected
nvd · python-tornado · debian · 13
6.4.2-3+deb13u2· all · trixieAffected
nvd · python-tornado · debian · 13
6.4.2-3+deb13u2· all · trixie-securityAffected
nvd · python-tornado · debian · 13
6.4.2-3+deb13u2· all · trixie-securityAffected
nvd · python-tornado · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2026_23523-1.json]
- [https://github.com/advisories/GHSA-mpf4-983q-p7j4]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-82397]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-82397]
- [https://osv.dev/vulnerability/SUSE-SU-2026:23523-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:24207-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:4073-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:4076-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-82397]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:22059-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-82397]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-82397.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]