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Fencer Vulns
high 7.7

CVE-2026-49853 json

Tornado: Authorization header forwarded across cross-origin redirects in SimpleAsyncHTTPClient

published 2026-06-15 4 mo ago modified 2026-10-24 15 d ago also EUVD-2026-44503 , GHSA-3x9g-8vmp-wqvf , PYSEC-2026-3387

cvss
7.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 38%
public exploits
0
none known

Summary

Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, SimpleAsyncHTTPClient shallow-copied redirected requests and removed only the Host header, leaving Authorization, auth_username, auth_password, and auth_mode in place when a redirect changed scheme, host, or port. This issue is fixed in version 6.5.6.

Patch / fix

  • pypi tornado 6.5.6
  • tornadoweb tornado 6.5.6
  • python-tornado RHEL 10.2 6.5.8-0.el10_2.1
  • python3-tornado RHEL 10.2 6.5.8-0.el10_2.1
  • python-tornado RHEL 9 6.5.8-0.el9_8.1
  • python3-tornado RHEL 9 6.5.8-0.el9_8.1
  • python-tornado enterprise linux eus 10.0 6.5.8-0.el10_0.1
  • python3-tornado enterprise linux eus 10.0 6.5.8-0.el10_0.1

red hat advisories RHSA-2026:80741RHSA-2026:67147RHSA-2026:67146

  • grafana Multi Linux Manager Tools SLE-15 12.4.10-150002.4.27.1
  • mgr-push Multi Linux Manager Tools SLE-15 5.2.5-150002.3.12.1
  • spacecmd Multi Linux Manager Tools SLE-15 5.2.10-150002.3.15.1
  • uyuni-tools Multi Linux Manager Tools SLE-Micro-5, Multi Linux Manager Tools SLE-15 5.2.17-150002.3.20.1
  • venv-salt-minion Multi Linux Manager Tools SLE-Micro-5, Multi Linux Manager Tools SLE-15 3006.0-150002.5.22.1
  • spacewalk-client-tools Multi Linux Manager Tools SLE-15 5.2.7-150002.3.12.1
  • golang-github-prometheus-prometheus Multi Linux Manager Tools SLE-15 3.13.2-150002.3.19.1
  • mgr-push Multi Linux Manager Tools SLE-12 5.2.5-120002.3.12.1

suse advisories SUSE-SU-2026:4585-1SUSE-SU-2026:4584-1SUSE-SU-2026:4583-1SUSE-SU-2026:4582-1SUSE-SU-2026:4581-1SUSE-SU-2026:4580-1

  • python-tornado6 openSUSE Leap 16.0 6.5-160000.5.1
  • python-tornado6 openSUSE Tumbleweed 6.5.7-1.1

opensuse advisories openSUSE-SU-2026:21067-1openSUSE-SU-2026:11027-1

  • python3-tornado AlmaLinux 9 6.5.8-0.el9_8.1
  • python3-tornado AlmaLinux 10 6.5.8-0.el10_2.1

almalinux advisories ALSA-2026:67146ALSA-2026:67147

  • python-tornado Rocky Linux 9 6.5.8-0.el9_8.1
  • python-tornado Rocky Linux 10 6.5.8-0.el10_2.1

rocky linux advisories RLSA-2026:67146RLSA-2026:67147

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-49853 updated cvss 7.7

tornado: Tornado: Information disclosure via improper handling of credentials during HTTP redirects

  • Red Hat Enterprise Linux 9 keylime, keylime-base, keylime-tenant, keylime-selinux, python3-keylime, keylime-verifier, +2 more
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 9) python-tornado 6.5.8-0.el9_8.1, python3-tornado 6.5.8-0.el9_8.1
    fixed: vendor fix RHSA-2026:67146
  • Red Hat Enterprise Linux AppStream (v. 10) python-tornado 6.5.8-0.el10_2.1, python3-tornado 6.5.8-0.el10_2.1
    fixed: vendor fix RHSA-2026:67147
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) python-tornado 6.4.2-1.el9_4.3, python3-tornado 6.4.2-1.el9_4.3
    fixed: vendor fix RHSA-2026:90777
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) python-tornado 6.5.8-0.el10_0.1, python3-tornado 6.5.8-0.el10_0.1
    fixed: vendor fix RHSA-2026:80741
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) python-tornado 6.4.2-2.el9_6.7, python3-tornado 6.4.2-2.el9_6.7
    fixed: vendor fix RHSA-2026:90283
  • Red Hat Exploit Intelligence exploit-intelligence-tech-preview/vulnerability-analysis-rhel9 Red Hat Lightspeed Core lightspeed-core/rag-tool-cpu-rhel9, lightspeed-core/lightspeed-stack-rhel9, lightspeed-core/rag-tool-cuda-12.9-rhel9
    not affected: vulnerable code not present
  • Red Hat Migration Toolkit for Applications 8 mta/mta-solution-server-rhel9 Red Hat OpenShift Lightspeed openshift-lightspeed/lightspeed-ocp-rag-rhel9
    not affected: component not present
show 1 more
  • Red Hat Ansible Automation Platform 2 ansible-automation-platform-26/lightspeed-chatbot-rhel9, ansible-automation-platform-27/lightspeed-chatbot-rhel9 Red Hat Enterprise Linux 8 pcs, pcs-snmp Red Hat Enterprise Linux 10 keylime 7.14.1-5.el10_2.1 Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, rhelai3/bootc-gaudi-rhel9, rhelai3/disk-image-cuda-rhel9 Red Hat Enterprise Linux AppStream E4S (v.9.4) python3-tornado-debuginfo 6.4.2-1.el9_4.3 Red Hat OpenShift AI (RHOAI) rhoai/odh-feature-server-rhel9, rhoai/odh-llama-stack-core-rhel9, rhoai/odh-th06-cpu-torch210-py312-rhel9, rhoai/odh-th06-cpu-torch291-py312-rhel9, rhoai/odh-th06-rocm64-torch291-py312-rhel9, rhoai/odh-th06-cuda130-torch210-py312-rhel9, +20 more
    +2 more products
    Red Hat OpenShift Container Platform 4 python-pep517, python-tornado Red Hat OpenStack Platform 16.2 rhosp-rhel8/openstack-redis, rhosp-rhel8/openstack-haproxy, rhosp-rhel8/openstack-mariadb, rhosp-rhel8/openstack-rabbitmq, rhosp-rhel8/openstack-ovn-northd, rhosp-rhel8/openstack-manila-share, +2 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.45% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
GitHub 3.1 7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
OSV 3.1 7.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
pypi tornado
<6.5.6
6.5.6

Affected products

  • tornadoweb tornado

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.