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CVE-2023-42447: blurhash panics on parsing crafted inputs

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-09-19 · updated 2026-06-17
• Weakness: CWE-248

Description

blurhash-rs is a pure Rust implementation of Blurhash, software for encoding images into ASCII strings that can be turned into a gradient of colors representing the original image. In version 0.1.1, the blurhash parsing code may panic due to multiple panic-guarded out-of-bounds accesses on untrusted input. In a typical deployment, this may get triggered by feeding a maliciously crafted blurhashes over the network. These may include UTF-8 compliant strings containing multi-byte UTF-8 characters. A patch is available in version 0.2.0, which requires user intervention because of slight API churn. No known workarounds are available.

Affected products

• whisperfish blurhash-rs: 0.1.1

References

• https://github.com/whisperfish/blurhash-rs/security/advisories/GHSA-cxvp-82cq-57h2
• https://github.com/whisperfish/blurhash-rs/security/advisories/GHSA-cxvp-82cq-57h2

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