Users of several NFT marketplaces see porn, Big Bang Theory stills appearing instead of their NFT images

A grid of Goonie NFTs from the RetroGoons project. Most are illustrations of monkey figures, but one has been replaced with a photograph of a nude woman.A collection on Magic Eden during the compromise (attribution)
Users of NFT marketplaces and explorer applications including Magic Eden, NFT Explorer, and Rand Gallery were briefly shown pornographic images and still frames from the Big Bang Theory television show instead of the expected NFT images after someone compromised a third-party image caching service. The affected NFTs used images stored on the decentralized storage system IPFS, and the NFTs themselves were not impacted. However, a third-party caching service used by the NFT platforms caused in some cases very unexpected images to display instead.

"What the fuck is happening, why my 5 years old kid watching porn JPEGs on [Magic Eden's] website" tweeted one shocked user.

The issue was resolved fairly quickly, although some visitors continued to see the unsavory images for a while longer due to browser caching.