CVE-2026-103262
published 2026-10-01CVE-2026-103262: Tornado versions before 6.5.9 contain an unbounded memory accumulation vulnerability in CurlAsyncHTTPClient that allows remote attackers to cause denial of…
PriorityP340high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.53%
43.7th percentile
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.
Affected
64 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| ansible-automation-platform-26 | lightspeed-chatbot-rhel9 | — | — |
| ansible-automation-platform-27 | lightspeed-chatbot-rhel9 | — | — |
| clusterlabs | pcs | — | — |
| debian | python-tornado | — | — |
| lightspeed-core | lightspeed-stack-rhel9 | — | — |
| lightspeed-core | rag-tool-cpu-rhel9 | — | — |
| lightspeed-core | rag-tool-cuda-12.9-rhel9 | — | — |
| mta | mta-solution-server-rhel9 | — | — |
| openshift-lightspeed | lightspeed-ocp-rag-rhel9 | — | — |
| openshift | ose-rhel-coreos-9 | — | — |
| rhel10 | keylime-registrar | — | — |
| rhel10 | keylime-verifier | — | — |
| rhel9 | keylime-registrar | — | — |
| rhel9 | keylime-verifier | — | — |
| rhelai3 | bootc-cuda-rhel9 | — | — |
| rhelai3 | bootc-gaudi-rhel9 | — | — |
| rhelai3 | bootc-rocm-rhel9 | — | — |
| rhelai3 | disk-image-cuda-rhel9 | — | — |
| rhoai | odh-feature-server-rhel9 | — | — |
| rhoai | odh-llama-stack-core-rhel9 | — | — |
| rhoai | odh-pipeline-runtime-datascience-cpu-py312-rhel9 | — | — |
| rhoai | odh-pipeline-runtime-minimal-cpu-py312-rhel9 | — | — |
| rhoai | odh-pipeline-runtime-pytorch-cuda-py312-rhel9 | — | — |
| rhoai | odh-pipeline-runtime-pytorch-llmcompressor-cuda-py312-rhel9 | — | — |
| rhoai | odh-pipeline-runtime-pytorch-rocm-py312-rhel9 | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv4.08.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat7.5HIGH
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Red Hat
tornado: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient
vendor_redhat·2026-10-01·CVSS 7.5
CVE-2026-103262 [HIGH] CWE-409 tornado: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient
tornado: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient
A flaw was found in Tornado. A remote malicious server can cause a Denial of Service (DoS) when an application using the CurlAsyncHTTPClient component fetches an untrusted web address. Because the client fails to enforce limits on incoming response sizes, the attacker can return a small, highly compressed payload (a decompression bomb) that expands to an enormous size. This unbounded memory consumption exhausts system resources and crashes the application.
Statement: This vulnerability has been rated as Important because an untrusted remote server can remotely terminate an application process through memory exhaustion without requiring credentials. By default, Tornado deploys the SimpleAsyncHTTPClient imple
VulDB
TornadoWeb Tornado up to 6.5.8 CurlAsyncHTTPClient denial of service (Nessus ID 365616)
vuldb·2026-10-14·CVSS 7.5
CVE-2026-103262 [HIGH] TornadoWeb Tornado up to 6.5.8 CurlAsyncHTTPClient denial of service (Nessus ID 365616)
A vulnerability, which was classified as problematic, has been found in TornadoWeb Tornado up to 6.5.8. This issue affects some unknown processing of the component CurlAsyncHTTPClient. Performing a manipulation results in denial of service.
This vulnerability is identified as CVE-2026-103262. The attack can be initiated remotely. There is not any exploit available.
It is advisable to upgrade the affected component.
GHSA
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.
ghsa_unreviewed·2026-10-01
CVE-2026-103262 [HIGH] CWE-409 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.
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.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-103262 python-pep517: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient [epel-all]
bugzilla·2026-10-07·CVSS 7.5
CVE-2026-103262 [HIGH] CVE-2026-103262 python-pep517: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient [epel-all]
CVE-2026-103262 python-pep517: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-103262 python-flit: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient [epel-all]
bugzilla·2026-10-07·CVSS 7.5
CVE-2026-103262 [HIGH] CVE-2026-103262 python-flit: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient [epel-all]
CVE-2026-103262 python-flit: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-103262 python-flit: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient [fedora-all]
bugzilla·2026-10-07·CVSS 7.5
CVE-2026-103262 [HIGH] CVE-2026-103262 python-flit: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient [fedora-all]
CVE-2026-103262 python-flit: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-103262 tornado: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient
bugzilla·2026-10-01·CVSS 7.5
CVE-2026-103262 [HIGH] CVE-2026-103262 tornado: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient
CVE-2026-103262 tornado: Tornado: Denial of Service via decompression bomb in CurlAsyncHTTPClient
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.
https://github.com/tornadoweb/tornado/commit/e412435febba4569c552c5c9054f1bf92bd171a9https://github.com/tornadoweb/tornado/security/advisories/GHSA-chx6-46f5-w4vphttps://www.vulncheck.com/advisories/tornado-before-6.5.9-denial-of-service-via-curlasynchttpclienthttps://github.com/tornadoweb/tornado/security/advisories/GHSA-chx6-46f5-w4vp
2026-10-01
Published