USN-8198-2: Tornado vulnerabilities
Publication date
28 April 2026
Overview
Several security issues were fixed in Tornado.
Releases
Packages
- python-tornado - scalable, non-blocking web server and tools
Details
USN-8198-1 fixed vulnerabilities in Tornado. This update provides the
corresponding updates for Ubuntu 26.04 LTS.
Original advisory details:
It was discovered that Tornado incorrectly handled parsing of large
multipart request bodies. An attacker could possibly use this issue to
cause a denial of service. (CVE-2026-31958)
It was discovered that Tornado did not properly validate characters in
cookie values. An attacker could possibly use this issue to inject
arbitrary cookie attributes. (CVE-2026-35536)
USN-8198-1 fixed vulnerabilities in Tornado. This update provides the
corresponding updates for Ubuntu 26.04 LTS.
Original advisory details:
It was discovered that Tornado incorrectly handled parsing of large
multipart request bodies. An attacker could possibly use this issue to
cause a denial of service. (CVE-2026-31958)
It was discovered that Tornado did not properly validate characters in
cookie values. An attacker could possibly use this issue to inject
arbitrary cookie attributes. (CVE-2026-35536)
Update instructions
In general, a standard system update will make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 26.04 LTS resolute | python3-tornado – 6.5.4-0.1ubuntu0.1 | ||
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