[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
tornado (source)	6.6 → 6.6.1

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Tornado: Open redirect via triple-slash redirect paths

CVE-2026-126347 / GHSA-5cjw-f85j-cv6r

More information

Details

Summary

Due to differences in the way browsers and Python's urllib parse urls, browsers treat a string starting with three or more slashes as a protocol-level redirect, while urllib does not. This means that the 6.6.0 fix for the RedirectHandler open redirect (CVE-2026-116578, commit cc75ab0e) is incomplete. Tornado 6.6.1 improves the open-redirect detection to handle this case correctly, as well as fixing a regression in the 6.6.0 implementation.

Severity

• CVSS Score: 3.1 / 10 (Low)
• Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

References

• https://github.com/tornadoweb/tornado/security/advisories/GHSA-5cjw-f85j-cv6r
• https://nvd.nist.gov/vuln/detail/CVE-2026-126347
• https://github.com/tornadoweb/tornado/commit/c503241622c0efe7c40110d89834ce8b7fead1e4
• https://github.com/tornadoweb/tornado/releases/tag/v6.6.1
• https://github.com/advisories/GHSA-5cjw-f85j-cv6r

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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Tornado: Open redirect via triple-slash redirect paths

CVE-2026-126347 / GHSA-5cjw-f85j-cv6r

More information

Details

Summary

Due to differences in the way browsers and Python's urllib parse urls, browsers treat a string starting with three or more slashes as a protocol-level redirect, while urllib does not. This means that the 6.6.0 fix for the RedirectHandler open redirect (CVE-2026-116578, commit cc75ab0e) is incomplete. Tornado 6.6.1 improves the open-redirect detection to handle this case correctly, as well as fixing a regression in the 6.6.0 implementation.

Severity

• CVSS Score: 3.1 / 10 (Low)
• Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

References

• https://github.com/tornadoweb/tornado/security/advisories/GHSA-5cjw-f85j-cv6r
• https://nvd.nist.gov/vuln/detail/CVE-2026-126347
• https://github.com/tornadoweb/tornado/commit/c503241622c0efe7c40110d89834ce8b7fead1e4
• https://github.com/tornadoweb/tornado
• https://github.com/tornadoweb/tornado/releases/tag/v6.6.1

This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).

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Release Notes

tornadoweb/tornado (tornado)

v6.6.1

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