| Package | Affected versions | Patched versions |
|---|---|---|
| fast-uri | < 3.1.1 | 3.1.1 |
| fast-uri | ≥ 3.0.0, < 3.1.1< 2.4.1 | 3.1.12.4.1 |
fast-uri v3.1.0 and earlier decodes percent-encoded path separators (%2F) and dot segments (%2E) before applying dot-segment removal in normalize() and equal(). This makes encoded path data behave like real / and .., so distinct URIs collapse onto the same normalized path.
For example, http://example.com/public/%2e%2e/admin normalizes to http://example.com/admin, and equal() considers them the same URI.
Applications that normalize or compare attacker-controlled URLs to enforce path-based policy can be bypassed. A path that looks confined under an allowed prefix can normalize to a different location.
Upgrade to fast-uri >= 3.1.1, or if you are in the v2.x release line, v2.4.1
None. Upgrade to the patched version.
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