CVE catalog
CVE-2023-54397
Tornado before 6.3.3 contains an HTTP request smuggling vulnerability due to improper parsing of Content-Length headers accepting non-standard characters. Attackers can send crafted HTTP requests with
- Severity
- Critical · CVSS 9
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:L/SI:H/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
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.38% · Oct 25, 2026
Tornado before 6.3.3 contains an HTTP request smuggling vulnerability due to improper parsing of Content-Length headers accepting non-standard characters. Attackers can send crafted HTTP requests with these characters to bypass proxy validation and smuggle requests when deployed behind certain proxies.
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 | fixed |
| Debian | python-tornado | forky | 6.5.5-5 | fixed |
| Debian | python-tornado | trixie | 6.4.2-3+deb13u2 | fixed |
| Debian | python-tornado | trixie-security | 6.4.2-3+deb13u2 | fixed |
| Debian | python-tornado | bookworm | 6.2.0-3+deb12u4 | vulnerable |
| Debian | python-tornado | bookworm-security | 6.2.0-3+deb12u4 | vulnerable |
| 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 | fixed |
| Suse | python-tornado | linux enterprise micro 5.3 | 4.5.3-150000.3.31.1 | fixed |
| Suse | python-tornado | linux enterprise micro 5.4 | 4.5.3-150000.3.31.1 | fixed |
| Suse | python-tornado | linux enterprise micro 5.5 | 4.5.3-150000.3.31.1 | fixed |
| Suse | python-tornado | linux enterprise module for basesystem 15 sp7 | 4.5.3-150000.3.31.1 | fixed |
| Suse | python-tornado | linux enterprise high performance computing 15 sp4-espos | 4.5.3-150000.3.31.1 | fixed |
| Suse | python-tornado | linux enterprise high performance computing 15 sp4-ltss | 4.5.3-150000.3.31.1 | fixed |
| Suse | python-tornado | linux enterprise high performance computing 15 sp5-espos | 4.5.3-150000.3.31.1 | fixed |
| Suse | python-tornado | linux enterprise high performance computing 15 sp5-ltss | 4.5.3-150000.3.31.1 | fixed |
| Suse | python-tornado | linux enterprise server 15 sp4-ltss | 4.5.3-150000.3.31.1 | fixed |
| Suse | python-tornado | linux enterprise server 15 sp5-ltss | 4.5.3-150000.3.31.1 | fixed |
| Suse | python-tornado | linux enterprise server 15 sp6-ltss | 4.5.3-150000.3.31.1 | fixed |
| Suse | python-tornado | linux enterprise server for sap applications 15 sp4 | 4.5.3-150000.3.31.1 | fixed |
| Suse | python-tornado | linux enterprise server for sap applications 15 sp5 | 4.5.3-150000.3.31.1 | fixed |
| Suse | python-tornado | linux enterprise server for sap applications 15 sp6 | 4.5.3-150000.3.31.1 | fixed |
| Suse | python-tornado6 | linux enterprise module for python 3 15 sp7 | 6.3.2-150400.9.27.1 | fixed |
| Suse | python-tornado6 | linux enterprise high performance computing 15 sp4-espos | 6.3.2-150400.9.27.1 | fixed |
| Suse | python-tornado6 | linux enterprise high performance computing 15 sp4-ltss | 6.3.2-150400.9.27.1 | fixed |
| Suse | python-tornado6 | linux enterprise high performance computing 15 sp5-espos | 6.3.2-150400.9.27.1 | fixed |
| Suse | python-tornado6 | linux enterprise high performance computing 15 sp5-ltss | 6.3.2-150400.9.27.1 | fixed |
| Suse | python-tornado6 | linux enterprise server 15 sp4-ltss | 6.3.2-150400.9.27.1 | fixed |
| Suse | python-tornado6 | linux enterprise server 15 sp5-ltss | 6.3.2-150400.9.27.1 | fixed |
| Suse | python-tornado6 | linux enterprise server 15 sp6-ltss | 6.3.2-150400.9.27.1 | fixed |
| Suse | python-tornado6 | linux enterprise server for sap applications 15 sp4 | 6.3.2-150400.9.27.1 | fixed |
| Suse | python-tornado6 | linux enterprise server for sap applications 15 sp5 | 6.3.2-150400.9.27.1 | fixed |
| Suse | python-tornado6 | linux enterprise server for sap applications 15 sp6 | 6.3.2-150400.9.27.1 | fixed |
| Ubuntu | python-tornado | noble | 6.4.0-1ubuntu0.6 | fixed |
| Ubuntu | python-tornado-doc | noble | 6.4.0-1ubuntu0.6 | fixed |
| Ubuntu | python3-tornado | noble | 6.4.0-1ubuntu0.6 | 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 | fixed |
| 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 | fixed |
| 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 | fixed |
| 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 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | python-tornado | source | sid | 6.4.0-1 | not yet assigned | Not reported | Not reported |
| Debian | python-tornado | source | forky | 6.4.0-1 | not yet assigned | Not reported | Not reported |
| Debian | python-tornado | source | trixie | 6.4.0-1 | not yet assigned | Not reported | Not reported |
| Debian | python-tornado | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Ubuntu | python-tornado | deb | pro | 6.1.0-3ubuntu0.1~esm6 | Not reported | UBUNTU-CVE-2023-54397 | Not reported |
| Suse | python-tornado | rpm | linux enterprise micro 5.3 | 4.5.3-150000.3.31.1 | Not reported | SUSE-SU-2026:4404-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise micro 5.4 | 4.5.3-150000.3.31.1 | Not reported | SUSE-SU-2026:4404-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise micro 5.5 | 4.5.3-150000.3.31.1 | Not reported | SUSE-SU-2026:4404-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise module for basesystem 15 sp7 | 4.5.3-150000.3.31.1 | Not reported | SUSE-SU-2026:4404-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise high performance computing 15 sp4-espos | 4.5.3-150000.3.31.1 | Not reported | SUSE-SU-2026:4404-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise high performance computing 15 sp4-ltss | 4.5.3-150000.3.31.1 | Not reported | SUSE-SU-2026:4404-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise high performance computing 15 sp5-espos | 4.5.3-150000.3.31.1 | Not reported | SUSE-SU-2026:4404-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise high performance computing 15 sp5-ltss | 4.5.3-150000.3.31.1 | Not reported | SUSE-SU-2026:4404-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise server 15 sp4-ltss | 4.5.3-150000.3.31.1 | Not reported | SUSE-SU-2026:4404-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise server 15 sp5-ltss | 4.5.3-150000.3.31.1 | Not reported | SUSE-SU-2026:4404-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise server 15 sp6-ltss | 4.5.3-150000.3.31.1 | Not reported | SUSE-SU-2026:4404-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise server for sap applications 15 sp4 | 4.5.3-150000.3.31.1 | Not reported | SUSE-SU-2026:4404-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise server for sap applications 15 sp5 | 4.5.3-150000.3.31.1 | Not reported | SUSE-SU-2026:4404-1 | Not reported |
| Suse | python-tornado | rpm | linux enterprise server for sap applications 15 sp6 | 4.5.3-150000.3.31.1 | Not reported | SUSE-SU-2026:4404-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise module for python 3 15 sp7 | 6.3.2-150400.9.27.1 | Not reported | SUSE-SU-2026:4403-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise high performance computing 15 sp4-espos | 6.3.2-150400.9.27.1 | Not reported | SUSE-SU-2026:4403-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise high performance computing 15 sp4-ltss | 6.3.2-150400.9.27.1 | Not reported | SUSE-SU-2026:4403-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise high performance computing 15 sp5-espos | 6.3.2-150400.9.27.1 | Not reported | SUSE-SU-2026:4403-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise high performance computing 15 sp5-ltss | 6.3.2-150400.9.27.1 | Not reported | SUSE-SU-2026:4403-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise server 15 sp4-ltss | 6.3.2-150400.9.27.1 | Not reported | SUSE-SU-2026:4403-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise server 15 sp5-ltss | 6.3.2-150400.9.27.1 | Not reported | SUSE-SU-2026:4403-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise server 15 sp6-ltss | 6.3.2-150400.9.27.1 | Not reported | SUSE-SU-2026:4403-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise server for sap applications 15 sp4 | 6.3.2-150400.9.27.1 | Not reported | SUSE-SU-2026:4403-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise server for sap applications 15 sp5 | 6.3.2-150400.9.27.1 | Not reported | SUSE-SU-2026:4403-1 | Not reported |
| Suse | python-tornado6 | rpm | linux enterprise server for sap applications 15 sp6 | 6.3.2-150400.9.27.1 | Not reported | SUSE-SU-2026:4403-1 | Not reported |
| Ubuntu | python-tornado | deb | noble | 6.4.0-1ubuntu0.6 | Not reported | Not reported | Not reported |
| Ubuntu | python-tornado-doc | deb | noble | 6.4.0-1ubuntu0.6 | Not reported | Not reported | Not reported |
| Ubuntu | python3-tornado | deb | noble | 6.4.0-1ubuntu0.6 | Not reported | Not reported | Not reported |
| Ubuntu | python-tornado | deb | pro | 6.1.0-3ubuntu0.1~esm6 | Not reported | USN-8952-1 | Not reported |
| Ubuntu | python-tornado | deb | 24.04 | 6.4.0-1ubuntu0.6 | Not reported | USN-8952-1 | Not reported |
| Ubuntu | python-tornado | deb | 26.10 | 6.5.5-5ubuntu1.1 | Not reported | USN-8952-1 | Not reported |
| Ubuntu | python-tornado | deb | 26.04 | 6.5.4-0.1ubuntu0.2 | Not reported | USN-8952-1 | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
References
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2026_4403-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2023-54397]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2023-54397]
- [https://osv.dev/vulnerability/SUSE-SU-2026:4403-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:4404-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2023-54397]
- [https://osv.dev/vulnerability/USN-8952-1]
- [https://security-tracker.debian.org/tracker/CVE-2023-54397]
- [https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54397.json]
- [https://ubuntu.com/security/notices/USN-8952-1]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]