How severe is GHSA-66m8-c62j-h6v5?

GHSA-66m8-c62j-h6v5 has a CVSS score of 6.2/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by GHSA-66m8-c62j-h6v5?

GHSA-66m8-c62j-h6v5 affects the following packages: jxl-oxide (crates.io). Ecosystems affected: crates.io.

How do I fix GHSA-66m8-c62j-h6v5?

Update jxl-oxide to 0.12.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-66m8-c62j-h6v5 is resolved across your whole dependency graph.

How do I detect GHSA-66m8-c62j-h6v5 in my crates.io dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for jxl-oxide, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-66m8-c62j-h6v5 if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is GHSA-66m8-c62j-h6v5 actively exploited in the wild?

No public exploit code has been indexed for GHSA-66m8-c62j-h6v5 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

When was GHSA-66m8-c62j-h6v5 published, and has it been updated?

GHSA-66m8-c62j-h6v5 was published on July 2, 2026 and was last updated on July 2, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🦀

🦀 crates.io

Not in CISA KEV

MEDIUM severity

jxl-oxide: `FrameBuffer::new` creates out-of-bounds slices on overflowGHSA-66m8-c62j-h6v5

MEDIUM

GHSA-66m8-c62j-h6v5 is a medium-severity (CVSS 6.2) vulnerability in jxl-oxide. A fix is available for jxl-oxide — see the affected versions and patch details below.

Published

Jul 2, 2026

Updated

Jul 2, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Jul 2, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

🦀jxl-oxide

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

Summary

jxl-oxide exposes a public safe API that can construct an undersized FrameBuffer due to unchecked usize multiplication, which immediately trigger panic while initializing the buffer in normal decoding path.

Additionally, calling the safe grouped buffer accessors afterward can create invalid oversized slices from a much smaller allocation, causing undefined behavior; however normal decoding path never reaches UB, because these methods are never used within jxl-oxide.

Impact

On 32-bit platforms this can cause panic by accessing out-of-range indices, making it a DoS vulnerability.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🦀crates.io	`jxl-oxide`	all versions	0.12.6`cargo update -p jxl-oxide --precise 0.12.6`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for jxl-oxide, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update jxl-oxide to 0.12.6 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-66m8-c62j-h6v5 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

### Summary `jxl-oxide` exposes a public safe API that can construct an undersized `FrameBuffer` due to unchecked `usize` multiplication, which immediately trigger panic while initializing the buffer in normal decoding path. Additionally, calling the safe grouped buffer accessors afterward can create invalid oversized slices from a much smaller allocation, causing undefined behavior; however normal decoding path never reaches UB, because these methods are never used within `jxl-oxide`. ### Impact On 32-bit platforms this can cause panic by accessing out-of-range indices, making it a DoS vuln

O3 Security · Impact-Aware SCA

Is GHSA-66m8-c62j-h6v5 in your dependencies?

Find it across crates.io, including transitive dependencies.

Scan my dependencies How O3 SCA works