'Survivor' Contestant Semhar Tadesse -- I Broke My Foot in Ugly Carpet Accident

She braved the wilderness ... but former "Survivor" contestant Semhar Tadesse was no match for the tacky carpet in her L.A. apartment ... snagging her heel and breaking her foot ... and now she's suing her landlord.

Making matters worse, sources tell TMZ the fall took place on the staircase back in August ... and we're told Semhar broke two bones in her foot.

Semhar filed a lawsuit in L.A. County Superior Court, claiming the injuries were so serious .... she couldn't work. Sources say her medical bills are already north of $20k.

Two months after the fall, Semhar was arrested for DUI -- she previously told TMZ, the only reason she bombed her field sobriety test was because of her injured foot, which prevented her from walking a straight line.