CVE-2023-42447Network attack vector

Process interruption via unchecked UTF-8 byte slicing

Published Sep 19, 2023 · Updated Sep 24, 2024

Uncaught panic in Whisperfish blurhash-rs 0.1.1 allows remote attackers to interrupt a consuming process via a crafted blurhash. The decode function validates the UTF-8 byte length but then slices the input at fixed byte offsets that can fall inside a multibyte character. No authentication or user interaction is required when a network-facing consumer passes attacker-controlled hashes to the library; the consequence is limited to that process's availability.

CVSS severity8.6
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncaught panic in Whisperfish blurhash-rs 0.1.1 allows remote attackers to interrupt a consuming process via a crafted blurhash. The decode function validates the UTF-8 byte length but then slices the input at fixed byte offsets that can fall inside a multibyte character. No authentication or user interaction is required when a network-facing consumer passes attacker-controlled hashes to the library; the consequence is limited to that process's availability.

The record

CVE
CVE-2023-42447
Published
Sep 19, 2023
Updated
Sep 24, 2024
Vendor
Whisperfish
Product
blurhash-rs
Classifications
CWE-392, CWE-1284, CWE-248, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion== 0.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Whisperfish · blurhash-rsversion== 0.1.1

Published CVSS scores

8.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-392Missing Report of Error Condition
CWE-1284Improper Validation of Specified Quantity in Input
CWE-248Uncaught Exception
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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