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Vulnerabilities

Vulnerability · CVE-2026-103262

Tornado before 6.5.9 Denial of Service via CurlAsyncHTTPClient

Published Oct 1, 2026 · catalog updated Oct 6, 2026 · Tornado before 6.5.9 Denial

Check if you run it

No confirmed exploitation is on record for CVE-2026-103262. EPSS is 0.53%. Act only if a listed version of Tornado before 6.5.9 Denial is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Tornado before 6.5.9 Denial).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.53%
Remediation
Advisory link
Affected products
vendor tornadoweb tornado

Tornado versions before 6.5.9 contain an unbounded memory accumulation vulnerability in CurlAsyncHTTPClient that allows remote attackers to cause denial of service by sending a compressed response. Attackers can send a gzip-encoded decompression bomb that accumulates in memory without size limits, causing the application process to be killed by out-of-memory conditions.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor tornadoweb tornadoversion unspecified

How to fix CVE-2026-103262

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-103262. EPSS is 0.53%. Act only if a listed version of Tornado before 6.5.9 Denial is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-409. EPSS 0.53%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Ubuntu security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 6, 2026 · CVE.org

    Updated

    Tornado versions before 6.5.9 contain an unbounded memory accumulation vulnerability in CurlAsyncHTTPClient that allows remote attackers to cause denial of service by sending a compressed response. Attackers can send a gzip-encoded decompression bomb that accumulates in memory without size limits, causing the application process to be killed by out-of-memory conditions.

  2. Oct 22, 2026 · Ubuntu Security Notices

    Detected

    CVE-2026-103262 is listed by USN-8952-1: Tornado vulnerabilities.

Sources

  • CVE.orgVulnerability recordCVE-2026-103262

    Tornado versions before 6.5.9 contain an unbounded memory accumulation vulnerability in CurlAsyncHTTPClient that allows remote attackers to cause denial of service by sending a compressed response. Attackers can send a gzip-encoded decompression bomb that accumulates in memory wi

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-103262

    30-day exploitation probability 0.53%

    first.org
  • Ubuntu Security NoticesVendor advisoryCVE-2026-103262

    It was discovered that Tornado did not properly handle certain HTTP requests and network inputs. An attacker could possibly use these issues to cause a denial of service, expose sensitive information, or bypass access controls. (CVE-2023-54397, CVE-2024-14029, CVE-2026-91990, CVE

    ubuntu.com

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.