OSV-2021-871 Heap-use-after-free in jxl::ImageBlender::PrepareBlending
A heap-use-after-free in the JPEG XL library allows attackers to execute arbitrary code or cause denial of service via crafted images.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is OSV-2021-871?
OSV-2021-871 is an use after free vulnerability in libjxl, published on 18 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35293
Crash type: Heap-use-after-free READ 8
Crash state:
jxl::ImageBlender::PrepareBlending
jxl::FinalizeFrameDecoding
jxl::FrameDecoder::Flush
Which versions are affected by OSV-2021-871?
1 open source package ship an affected version, including libjxl.
| Package | Affected | Fixed in |
|---|---|---|
libjxl OSS-Fuzz | All versions | None |
How do I fix OSV-2021-871?
No fix has been published for OSV-2021-871 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is OSV-2021-871 being exploited?
There is no known exploitation of OSV-2021-871 in the wild and no public exploit code.