CVE-2026-91992
Publication date 15 September 2026
Last updated 22 October 2026
Ubuntu priority
Description
Tornado before 6.5.7 contains a credential leak vulnerability in CurlAsyncHTTPClient where pycurl handles are reused across requests without proper state clearing. Attackers can obtain sensitive credentials by issuing requests through the same client instance, allowing TLS certificates or proxy authentication to persist across unintended requests.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| python-tornado | 26.10 stonking |
Fixed in 6.5.5-5ubuntu1
|
| 26.04 LTS resolute |
Fixed in 6.5.4-0.1ubuntu0.2
|
|
| 24.04 LTS noble |
Fixed in 6.4.0-1ubuntu0.6
|
|
| 22.04 LTS jammy |
Fixed in 6.1.0-3ubuntu0.1~esm6
|
|
| 20.04 LTS focal |
Fixed in 6.0.3+really5.1.1-3ubuntu0.1~esm6
|
|
| 18.04 LTS bionic |
Fixed in 4.5.3-1ubuntu0.2+esm4
|
|
| 16.04 LTS xenial |
Fixed in 4.2.1-1ubuntu3.1+esm4
|
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CVSS version:
Base score
8.2 · High
Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Base score
5.9 · Medium
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
References
Related Ubuntu Security Notices (USN)
- USN-8952-1
- Tornado vulnerabilities
- 22 October 2026