VulnerabilityPublished 11 Nov 2026

CVE-2026-115927: python-tornado security update

Affects python-tornadoSource GCVE Database

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Authoritative record:CVE-2026-115927· Medium 5.3

Not known to be exploited · CVSS 5.3 Medium : upgrade to 6.6-1.oe2403sp1 when convenient.

Data as of 11 Nov 2026, 14:48 UTC

CVSS 3.1 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none

CVSS scores by source
CNA (GitHub_M)	CVSS 3.1	5.3

Patch: Available – fixed in 6.6-1.oe2403sp1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: Low

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the impacted component are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 26 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade python-tornado to 6.6-1.oe2403sp1.

Affected software

Product	Affected	Fixed in
openEuler 24.03-LTS-SP1python-tornado`pkg:rpm/openEuler/python-tornado&distro=openEuler-24.03-LTS-SP1`Other threats	Affected <6.6-1.oe2403sp1	Fixed in 6.6-1.oe2403sp1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A security update is available in Tornado version 6.6.0 that fixes all described vulnerabilities. Users should upgrade to version 6.6.0 or later to remediate these issues. No additional mitigations are specified or required beyond applying the official patch.

Description

Multiple security vulnerabilities were identified in the Tornado Python web framework prior to version 6.6.0. These include a denial-of-service condition caused by inefficient processing of HTTP/1.1 chunked transfer encoding, a CPU exhaustion issue due to obsolete HTTP header line folding, and an open redirect vulnerability in the RedirectHandler URL templates. These flaws allow unauthenticated remote attackers to stall the event loop, block other connections, or perform phishing attacks via crafted redirects. All issues are fixed in Tornado version 6.6.0.

Impact

The vulnerabilities impact availability and integrity. The chunked transfer encoding and header parsing issues can cause denial of service by stalling or blocking the event loop, affecting all connections served by the process. The open redirect vulnerability can be exploited for phishing attacks by redirecting users to attacker-controlled destinations while appearing to originate from the legitimate domain. Confidentiality impact is limited (partial information disclosure possible via phishing). No known exploitation in the wild has been reported.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 11 Nov 2026, 14:48 UTC

Technical details

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