# CVE-2026-91991: python-tornado: This update for python-tornado fixes the following issues:  - CVE-2023-54397: Tornado before 6.3.3 contains an HTTP r...

CVE-2026-91991 is fixed in 2 products on 1 platform, first by SUSE-SU-2026:4403-1, released September 30, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-91991
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 30, 2026

## Description

This update for python-tornado fixes the following issues:  - 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. At (bsc#1280689). - CVE-2024-58384: CRLF injection in CurlAsyncHTTPClient headers (bsc#1281059). - CVE-2026-91990: splitting of multipart data before validation of the `max_parts` limit allows for resource exhaustion   and a denial of service (bsc#1281439). - CVE-2026-91991: incomplete fix for cookie attribute injection allows for cookie validation bypass via semicolon-   delimited data in capitalized parameters (bsc#1281440).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python-tornado sles 15.6 | 4.5.3-150000.3.31.1 | [SUSE-SU-2026:4404-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4404-1.md) | Sep 30, 2026 |
| Linux | python-tornado sles 15.7 | 4.5.3-150000.3.31.1 | [SUSE-SU-2026:4404-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4404-1.md) | Sep 30, 2026 |
| Linux | python-tornado6 opensuse-leap 16.0 | 6.5-160000.7.1 | [OPENSUSE-SU-2026:22059-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22059-1.md) | Nov 7, 2026 |
| Linux | python-tornado6 sles 15.6 | 6.3.2-150400.9.27.1 | [SUSE-SU-2026:4403-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4403-1.md) | Sep 30, 2026 |
| Linux | python-tornado6 sles 15.7 | 6.3.2-150400.9.27.1 | [SUSE-SU-2026:4403-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4403-1.md) | Sep 30, 2026 |
| Linux | python-tornado6 sles 16.0 | 6.5-160000.7.1 | [SUSE-SU-2026:24207-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24207-1.md) | Nov 7, 2026 |

---

Data as of 2026-11-10T07:50:38Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.