GHSA-78cv-mqj4-43f7

ghsaUSosv

Tornado has incomplete validation of cookie attributes

view advisory published 2026-03-11Licence: CC-BY-4.0

Values passed to the `domain`, `path`, and `samesite` arguments of `RequestHandler.set_cookie` were not completely validated in versions of Tornado prior to 6.5.5. In particular, semicolons would be allowed, which could be used to inject attacker-controlled values for other cookie attributes.

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-35536US	medium5.3	0.24% (15th)	—	2026-04-03
In Tornado before 6.5.5, cookie attribute injection could occur because the domain, path, and samesite arguments to .RequestHandler.set_cookie were not checked for crafted characte…

references

External citations — patches, advisories, analysis.

https://github.com/tornadoweb/tornadoPACKAGE
https://github.com/tornadoweb/tornado/commit/24a2d96ea115f663b223887deb0060f13974c104WEB
https://github.com/tornadoweb/tornado/releases/tag/v6.5.5WEB
https://github.com/tornadoweb/tornado/security/advisories/GHSA-78cv-mqj4-43f7WEB

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