CVE-2026-31958
HIGH7.5EPSS 0.03%Tornado is vulnerable to DoS due to too many multipart parts
發布日:2026/3/12修改日:2026/5/20
描述
Tornado is a Python web framework and asynchronous networking library. In versions of Tornado prior to 6.5.5, the only limit on the number of parts in multipart/form-data is the max_body_size setting (default 100MB). Since parsing occurs synchronously on the main thread, this creates the possibility of denial-of-service due to the cost of parsing very large multipart bodies with many parts. This vulnerability is fixed in 6.5.5.
受影響套件(3)
- Debian/python-tornadofrom 0, < 6.1.0-1+deb11u4
- PyPI/tornadofrom 0, < 6.5.5
- PyPI/tornadofrom 0, < 6.5.5
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
參考連結(7)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-31958
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-31958
- PATCHhttps://github.com/tornadoweb/tornado
- WEBhttps://github.com/tornadoweb/tornado/commit/119a195e290c43ad2d63a2cf012c29d43d6ed839
- WEBhttps://github.com/tornadoweb/tornado/releases/tag/v6.5.5
- WEBhttps://github.com/tornadoweb/tornado/security/advisories/GHSA-qjxf-f2mg-c6mc
- WEBhttps://lists.debian.org/debian-lts-announce/2026/04/msg00000.html