8.2

CVE-2026-91992: tornadoweb tornado

CVSS: 8.2v4.0HighDeferred
AliasesGHSA-pw6j-qg29-8w7fUBUNTU-CVE-2026-91992DEBIAN-CVE-2026-91992
Published 15-09-2026Last modified 17-09-2026
Open JSON

Vulnerability summary

CVE-2026-91992 is a high (CVSS 8.2) vulnerability in tornadoweb tornado. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 16.9% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.2/10
010
High · v4.0 (CVE.org)
EPSS score
0.26%
0%100%
Low · +0.06 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 15-09-2026
    PublishedVulnerability first disclosed.
  2. 17-09-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

8 scores · 5 sources · 2 versions

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

17%

Versus all other CVEs

30-day change

+0.06 pp

From 0.21% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.26%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • python-tornadoAll versions (No fix recorded)
PyPI1 product
  • tornado< 6.5.7
Tornadoweb1 product
Ubuntu1 product
  • python-tornadoAll versions (No fix recorded)

4 vendors · 4 products

References

6 links