CVE-2024-11498

What it actually does

Stack buffer overflow in JPEG XL decoder allows a crafted file to allocate up to 256 MB (possibly 512 MB) on the stack, exhausting available stack space and causing crashes or excessive memory consumption.

Why it matters to the business

Applications that decode JPEG XL images can crash or become unresponsive when processing attacker-supplied files, leading to service disruption and potential loss of availability for image-handling workflows; low exploit maturity and absence from known exploited lists reduce immediate widespread risk but still require prompt patching of the widely used library.

How an attack unfolds

An attacker crafts a malicious JPEG XL file designed to trigger excessive stack allocations during decoding. The file is delivered to a target application or service that uses libjxl, causing the decoder to consume large amounts of stack memory and potentially crash the process.

How to fix it

Upgrade libjxl to commit aa2df30120b92078ab7b172fadf97dd7a937f51a or later; rebuild and redeploy all dependent applications; test image processing pipelines with the updated library.

How to confirm the fix worked

Confirm the installed libjxl commit is aa2df30120b92078ab7b172fadf97dd7a937f51a or newer; run decoder unit tests against known large-stack test vectors; monitor process memory usage during image decoding.

Typical attack path

1. Identify or compromise a target that processes JPEG XL images using libjxl
2. Craft a JPEG XL file that forces large stack allocations in the decoder
3. Deliver the file via upload, download, email attachment, or web content
4. Trigger decoding to exhaust stack resources and induce denial of service

How to detect it

Search application and system logs for sudden crashes or out-of-memory errors during JPEG XL decoding; monitor for processes consuming unusually high stack memory when handling image files; review any available crash dumps or stack traces for decoder entry points.

What your security team should do

• Prioritize upgrade of libjxl in all image-processing services within the next maintenance window
• Inventory all products and containers that depend on libjxl and schedule updates
• Add memory-usage monitoring for image decoders to detect anomalous stack growth
• Review and restrict untrusted JPEG XL file sources until patched