CVE-2021-22563: Memory Overread in libjxl

Severity: medium (CVSS 4.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-11-01 · updated 2026-06-17
Weakness: CWE-126

Description

Invalid JPEG XL images using libjxl can cause an out of bounds access on a std::vector<std::vector<T>> when rendering splines. The OOB read access can either lead to a segfault, or rendering splines based on other process memory. It is recommended to upgrade past 0.6.0 or patch with https://github.com/libjxl/libjxl/pull/757

Affected products

libjxl: before 0.6.0 — fixed in 0.6.0

How to fix

Upgrade to a fixed version: libjxl 0.6.0. Check the vendor advisory for mitigations.

References

https://github.com/libjxl/libjxl/issues/735
https://github.com/libjxl/libjxl/pull/757
https://github.com/libjxl/libjxl/issues/735
https://github.com/libjxl/libjxl/pull/757

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