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Graph/blob-upload-path-prefix-misrouting

Pattern

Blob Upload Path Prefixing

blob-upload-path-prefix-misrouting

A recurring upload-shape where manual pathname reconstruction and misused prefix settings cause stored objects to land in the blob root or unexpected pseudo-folders, even while uploads succeed, creating messy storage and token/path drift.

Node Details

Public graph metadata

Updated5/1/2026

Connections

30 linked nodes

the image is not loading — whenever the email is delivered to an inbox. Tension: the `src` of the image goes to a `404` page. Outcome: To serve the images better you should look at a service like Vercel blob.

in `onUploadProgress` and `onSuccess` callback. Tension: the `files` variable is not updated properly.

it uploads the file successfully, but just dumps the file on the "root" directory in Vercel blob storage — upload an image for example via the Payload admin upload feature. Tension: This makes my blob storage explorer in Vercel look very messy. Outcome: I would therefore very much like a folder for each project.

Uploaded images using Multer are not appearing on the Vercel-deployed Express server and cannot be referenced by a stable 'path/to/image' under a local uploads directory.

EROFS: read-only file system, open '/var/task/public/bb17ad93-017f-4fdf-a2db-713d9a390143.webp' — When i try to upload file to public folder on vercel. Tension: works perfectly fine in my dev environment(local computer) but after deploying to vercel it throws that error. Outcome: you want to persist the file then better to store somewhere, probably in S3.

This code works but is not in production. — upload files using an API and then store them inside the public folder of Nuxt. Tension: the file directory will change in production. Outcome: you CANNOT use public folder for serving dynamic images.

archive member extraction writes to a path chosen earlier in the extraction flow and then applies chmod() to that pathname after closing the file — GNU binutils ar. Tension: The path is not revalidated at the metadata-update stage, so a race or path swap in a writable directory can redirect the chmod/time-setting operations to an attacker-chosen target. Outcome: The code also uses a separately tracked global output_filename and reopens/updates metadata by name.

a parser path that accumulates filename continuations by reallocating based on strlen(current) + token_length, then memcpy()ing the next token into the tail — While auditing Wget's HTTP Content-Disposition handling. Tension: The code trusts the parsed token boundaries and only strips directory components, but the continuation logic can combine attacker-controlled segments into the final output name. Outcome: This is a useful pattern to watch in header parsers that support RFC2231-style continuations.

trying to get an object from my S3 bucket using pre-signed URLs. Tension: I've tried encoding the slashes `%2f` with no change. Outcome: upgrade to the latest SDK, in your case boto3.

using pre-signed-url, I can't check the file size of each part — multipart upload in my application. Tension: all the options I thought do not appear to be good one. Outcome: I really would not like to get the file in any endpoint of my application.

the file is remaining in the bucket sometimes with delete markers — when the function runs via the S3 trigger. Tension: If I run the function using the Test button afterwards, it deletes every time. Outcome: I was able to resolve this by using Cloudwatch EventBridge to monitor S3 CreateObject event.

S3 blocking requests (403 Forbidden, no response body) if the filename is constructed from Unicode codepoints — Upload via presigned request - 403 forbidden for Unicode Filename. Tension: filename is constructed from Unicode codepoints. Outcome: Using `x-amz-meta-filename` suggests that the user-provided meta-data is transferred via HTTP request headers.

All of the put/upload functions want a set content length. Tension: Building the zip locally is not an option, because the end size of the zip can be tens of GB. Outcome: I essentially need a zip "placeholder" on S3 that I can stream to.

facing throttling issues (503 errors) — writing to S3, and facing throttling issues (503 errors). Tension: our ingestion service still encounters 503 errors. Outcome: the files are showing right under my bucket at the root level.

pre-sign the URL to upload a file in Flask. Outcome: The problem is that you created a pre-signed URL that includes a Content-Type header but you didn't indicate that header later when you used the URL.

Uploading to S3 via a presigned PUT URL does not apply the desired object tags even when the server-side PutObjectCommand includes the Tagging parameter.

Minio upload with a stream blocks until the file stream is closed

aws s3 ls s3://bucketname > out.txt does not efficiently export 10m S3 objects as file URLs

when I try uploading from mobile browsers, the upload just loads forever — I'm building a document uploader using Supabase Storage. Outcome: I've tried using different networks, browsers and devices, but it's still the same problem.

Accessing /admin in a NextJS app using the PayloadCMS S3Storage plugin fails with the error: "useUploadHandlers must be used within UploadHandlersProvider".

There is upload property for the collection, it is not a field.

Redux Toolkit reports that a non-serializable value was detected in an action payload when dispatching/store updates involving a downloaded File/Blob.

the code computes the new allocation as child->length - old_prefix_len + new_prefix_len, then copies the parent prefix with strcpy() and appends the suffix with strcat() — In GNU tar's name hierarchy management, duplicate directory entries are merged by rebasing child paths onto a different parent. Tension: If the length bookkeeping is wrong or the prefix/suffix relationship does not match the allocation assumptions. Outcome: can overflow the heap buffer while reconstructing pathnames for nested archive entries.

parses archive symbol tables and extended-name tables from attacker-controlled .a files — gold linker. Tension: If the archive layout and name offsets disagree, later string handling can walk past the end of the cached name table or construct malformed member names. Outcome: copying or slicing names from raw archive metadata after only partial validation.

the path always ends up being `null` or an empty string — file drag and drop. Tension: capture and display the file names, but the path always ends up being `null` or an empty string.

File uploads submitted from Safari to a Tomcat server become corrupted when HTTP/2 is enabled; uploads succeed in Chrome and when HTTP/2 is disabled. The issue affects multiple medium-sized files (a few MB).

Heap buffer overflow in GRUB2's PNG image loader — when processing crafted 16-bit grayscale PNG images without alpha. Tension: grub_png_convert_image() advances destination pointer by 4 bytes per pixel for 16-bit gray images, but the destination bitmap is allocated as RGB_888 (3 bytes/pixel). Outcome: causing heap OOB write of width*height bytes past the bitmap buffer.

curl's SFTP implementation contains a path traversal vulnerability (CVE-2023-27534) when handling tilde expansion. — When processing SFTP URLs with paths beginning with '/~/'. Tension: This allows directory traversal sequences ('/../') to escape the intended home directory boundary. Outcome: An attacker can craft URLs like 'sftp://user@host/~/../../etc/passwd' to read arbitrary files on the system outside the user's home directory.

non-bootstrap .md files in workspace root get injected into every turn's system prompt — OpenClaw workspace bootstrap files. Tension: causing massive token waste ($30-480/month).

subtracting 4 bytes from the end and writing "orig" — when saving .orig backups during HTML-extension adjustment. Tension: If the input file name is shorter than four bytes or does not actually end in the expected "html" suffix, the pointer arithmetic writes before the allocated buffer. Outcome: causing stack memory corruption.

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