Bug: Lemmy replaces direct image url with a proxied one in preformatted blocks (lemmy.ml)

submitted 2 weeks ago by ferric_carcinization@lemmy.ml to c/lemmy@lemmy.ml

6 comments fedilink hide all child comments

When a code block contains syntax for an image, lemmy seems to replace the image's url with a proxied one.

This instance's web UI's preview displays the original url correctly. The proxied url is also distributed trough federation, so users on other instances or for example Piefed should also see the lemmy.ml url in the example below.

This behavior is unexpected, as the contents of a code block should not be parsed as markdown, and thus no image should be displayed and no requests to the server should be made.

Example: I entered "https://media.piefed.zip/posts/bT/UD/bTUDGZRAcKZdXyO.png" as the url in the following code block in the web UI: ![alt text](https://lemmy.ml/api/v3/image_proxy?url=https%3A%2F%2Fmedia.piefed.zip%2Fposts%2FbT%2FUD%2FbTUDGZRAcKZdXyO.png)

Lemmy UI version: 0.19.17
Lemmy backend version: 0.19.18-beta.0

you are viewing a single comment's thread
view the rest of the comments

[-] ferric_carcinization@lemmy.ml 1 points 2 weeks ago

Does it really help that much? It's trivial to reverse and no requests are made to the server, by clients or instances, if it's in a code block.

Either way, this seems non-obvious and I can't remember seeing it documented anywhere.

[-] scrubbles@poptalk.scrubbles.tech 5 points 2 weeks ago* (last edited 2 weeks ago)

Yes it does.

Release notes

[-] ferric_carcinization@lemmy.ml 2 points 2 weeks ago

That doesn't explain why urls in code blocks are rewriten as well. When the image is surrounded by backticks, it shouldn't be parsed but rather displayed verbatim as the code block's content.

[-] scrubbles@poptalk.scrubbles.tech 4 points 2 weeks ago

That's a fair one, could write a bug for it on GitHub

[-] ferric_carcinization@lemmy.ml -2 points 2 weeks ago

Sorry, but could I ask you to file the issue? I would rather not associate my social accounts with my real identity.

I probably should have filed an issue to begin with.

this post was submitted on 05 Apr 2026

28 points (96.7% liked)

Lemmy

14580 readers

11 users here now

Everything about Lemmy; bugs, gripes, praises, and advocacy.

For discussion about the lemmy.ml instance, go to !meta@lemmy.ml.

founded 6 years ago

MODERATORS

nutomic@lemmy.ml