> CVE-2026-49853 [HIGH]

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PUBLISHED
2026-07-14 21:17
MODIFIED
2026-07-14 21:17
CVSS_SCORE V3
7.7
EPSS (Prob. Exploit)
0.45%
Top 61.2%
DATA SOURCES:
NVD đź”— 2026-07-14 CWE MITRE đź”— 2026-11-01 FIRST EPSS đź”— 2026-11-01 GITHUB đź”— 2026-11-05 OSV đź”— 2026-11-02

> DESCRIPTION

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.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> CVSS V3 METRICS

CVSS_VECTOR
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
EXPLOITABILITY
3.1
IMPACT
4.0

> MÉTRIQUES CVSS DÉTAILLÉES

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Métrique Valeur Interprétation
AV (Vecteur d'Attaque)
Attack Vector
Network (N)
Exploit possible à distance via réseau (HTTP, API, etc.)
AC (Complexité d'Attaque)
Attack Complexity
Low (L)
Peu de conditions requises pour exploiter
PR (Privilèges Requis)
Privileges Required
Low (L)
Authentifié avec compte utilisateur basique
UI (Interaction Utilisateur)
User Interaction
None (N)
Aucune interaction utilisateur nécessaire
S (Périmètre)
Scope
Changed (C)
Impact s'Ă©tend au-delĂ  du composant compromis
C (Impact Confidentialité)
Confidentiality Impact
High (H)
Divulgation totale d'informations
I (Impact Intégrité)
Integrity Impact
None (N)
Aucune modification de données possible
A (Impact Disponibilité)
Availability Impact
None (N)
Aucune interruption de service

> RÉSUMÉ DES IMPACTS

Confidentialité
High
Divulgation totale d'informations
Intégrité
None
Aucune modification de données possible
Disponibilité
None
Aucune interruption de service

> WEAKNESSES

CWE-200

> CWE DETAILED DESCRIPTIONS

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor - The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

> RED HAT SECURITY ADVISORIES

Red Hat Security Advisory: python-tornado security update
An update for python-tornado is now available for Red Hat Enterprise Linux 9. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring S...
Red Hat Security Advisory: python-tornado security update
An update for python-tornado is now available for Red Hat Enterprise Linux 10. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring...
Red Hat Security Advisory: python-tornado security update
An update for python-tornado is now available for Red Hat Enterprise Linux 10.0 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Com...
Red Hat Security Advisory: python-tornado security update
An update for python-tornado is now available for Red Hat Enterprise Linux 9.6 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Comm...
Red Hat Security Advisory: python-tornado security update
An update for python-tornado is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Importa...

> GITHUB SECURITY ADVISORY

GHSA-3x9g-8vmp-wqvf HIGH

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

AFFECTED PACKAGES:
PIP / tornado
< 6.5.6
Fixed in: 6.5.6

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

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

AFFECTED PACKAGES:
Unknown / Unknown
54 versions affected
ALIASES:
GHSA-3x9g-8vmp-wqvf, PYSEC-2026-3387

> HISTORIQUE DES MODIFICATIONS

Première apparition
14/07/2026 21:17
Source: NVD
đź“Š ENRICHISSEMENT 01/08/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-200: Exposure of Sensitive Information to an Unauthorized Actor - The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
Total des modifications: 1 Dernière mise à jour: 3 months ago

> REFERENCES

https://github.com/tornadoweb/tornado/commit/aba2569f7ed7a6bdbef816658fb6b718253...
https://github.com/tornadoweb/tornado/pull/3626
https://github.com/tornadoweb/tornado/releases/tag/v6.5.6
https://github.com/tornadoweb/tornado/security/advisories/GHSA-3x9g-8vmp-wqvf
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