Packages
- python-tornado - scalable, non-blocking web server and tools
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)
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 | ||
|---|---|---|---|
| 25.10 questing | python3-tornado – 6.4.2-3ubuntu0.3 | ||
| 24.04 LTS noble | python3-tornado – 6.4.0-1ubuntu0.5 | ||
| 22.04 LTS jammy | python3-tornado – 6.1.0-3ubuntu0.1~esm5 | ||
| 20.04 LTS focal | python3-tornado – 6.0.3+really5.1.1-3ubuntu0.1~esm5 | ||
| 18.04 LTS bionic | python-tornado – 4.5.3-1ubuntu0.2+esm3 | ||
| python3-tornado – 4.5.3-1ubuntu0.2+esm3 | |||
| 16.04 LTS xenial | python-tornado – 4.2.1-1ubuntu3.1+esm3 | ||
| python3-tornado – 4.2.1-1ubuntu3.1+esm3 | |||
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