python3-tornado: Tornado versions before 6.5.9 contain an unbounded memory accumulation vulnerability in CurlAsyncHTTPClient that allo...
CVE-2026-103262 is fixed in 9 products on 1 platform, first by python3-tornado 6.5.4-0.1ubuntu0.2, released October 1, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| python-tornado · RHEL 10 | 6.5.10-0.el10_0.1 | RHSA-2026:91583 | Oct 13, 2026 |
| python-tornado · Ubuntu 18.04.6 LTS (bionic) | 4.5.3-1ubuntu0.2+esm4 | python-tornado 4.5.3-1ubuntu0.2+esm4 | Oct 24, 2026 |
| python-tornado · rocky 10 | 0:6.5.10-1.el10_2.1 | RLSA-2026:82041 | Nov 7, 2026 |
| python-tornado · rocky 9 | 0:6.5.10-1.el9_8.1 | RLSA-2026:82040 | Nov 7, 2026 |
| python-tornado-debugsource · amzn 2023 | 6.1.0-2.amzn2023.0.12 | ALAS2023-2026-3292 | Nov 7, 2026 |
| python-tornado-doc · amzn 2023 | 6.1.0-2.amzn2023.0.12 | ALAS2023-2026-3292 | Nov 7, 2026 |
| python3-tornado · RHEL 9 | 0:6.5.10-1.el9_8.1 | RHSA-2026:82040 | Oct 13, 2026 |
| python3-tornado · Ubuntu 18.04.6 LTS (bionic) | 4.5.3-1ubuntu0.2+esm4 | python3-tornado 4.5.3-1ubuntu0.2+esm4 | Oct 24, 2026 |
| python3-tornado · Ubuntu 24.04.5 LTS (noble) | 6.4.0-1ubuntu0.6 | python3-tornado 6.4.0-1ubuntu0.6 | Oct 24, 2026 |
| python3-tornado · Ubuntu 26.04.1 LTS (resolute) | 6.5.4-0.1ubuntu0.2 | python3-tornado 6.5.4-0.1ubuntu0.2 | Oct 1, 2026 |
| python3-tornado · almalinux 10 | 6.5.10-1.el10_2.1 | ALSA-2026:82041 | Nov 7, 2026 |
| python3-tornado · almalinux 9 | 6.5.10-1.el9_8.1 | ALSA-2026:82040 | Nov 7, 2026 |
| python3-tornado · amzn 2023 | 6.1.0-2.amzn2023.0.12 | ALAS2023-2026-3292 | Nov 7, 2026 |
| python3-tornado · ol 10 | 0:6.5.10-1.el10_2.1 | ELSA-2026-82041 | Nov 7, 2026 |
| python3-tornado · ol 9 | 0:6.5.10-1.el9_8.1 | ELSA-2026-82040 | Nov 7, 2026 |
| python3-tornado-debuginfo · amzn 2023 | 6.1.0-2.amzn2023.0.12 | ALAS2023-2026-3292 | Nov 7, 2026 |
| python3.13-tornado · amzn 2023 | 6.4.2-1.amzn2023.0.7 | ALAS2023-2026-3293 | Nov 7, 2026 |
| python3.13-tornado-debuginfo · amzn 2023 | 6.4.2-1.amzn2023.0.7 | ALAS2023-2026-3293 | Nov 7, 2026 |
| python3.13-tornado-debugsource · amzn 2023 | 6.4.2-1.amzn2023.0.7 | ALAS2023-2026-3293 | Nov 7, 2026 |
| python3.13-tornado-doc · amzn 2023 | 6.4.2-1.amzn2023.0.7 | ALAS2023-2026-3293 | Nov 7, 2026 |
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