CVE-2022-4996Public exploitNetwork attack vector

Interpreter crash via incorrect udiv comparison

Published Aug 19, 2026 · Updated Aug 21, 2026

Floating-point comparison error in mruby 3.1.0 allows remote attackers to crash an exposed interpreter through crafted BigInt division. The udiv function in bigint.c applies an incorrect comparison operator while processing attacker-controlled large-integer division, provoking a floating-point exception. No privileges or user interaction are required, but network reachability depends on an embedding application passing remote input into the affected arithmetic path.

CVSS severity5.3
Medium
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Floating-point comparison error in mruby 3.1.0 allows remote attackers to crash an exposed interpreter through crafted BigInt division. The udiv function in bigint.c applies an incorrect comparison operator while processing attacker-controlled large-integer division, provoking a floating-point exception. No privileges or user interaction are required, but network reachability depends on an embedding application passing remote input into the affected arithmetic path.

The record

CVE
CVE-2022-4996
Published
Aug 19, 2026
Updated
Aug 21, 2026
Vendor
mruby
Product
mruby
Classifications
CWE-1077, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 2026Record 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=3.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

mruby · mrubyversion=3.1.0

Published CVSS scores

5.0NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
5.5UbuntuCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
5.3UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1077Floating Point Comparison with Incorrect Operator
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

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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