CVE-2026-79590

Application crash via NULL parser string pointer

Published Sep 10, 2026 · Updated Sep 10, 2026

NULL pointer dereference in the Prism parser in mruby 4.0.0 allows attackers to crash an application via crafted Ruby source. The parser passes a NULL pointer derived from malformed source to string-handling functions whose contracts require a non-NULL argument. The crash requires an application to parse the crafted source and interrupts that application without a reported data-access impact.

CVSS severityUnavailable
Unscored
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Prism parser in mruby 4.0.0 allows attackers to crash an application via crafted Ruby source. The parser passes a NULL pointer derived from malformed source to string-handling functions whose contracts require a non-NULL argument. The crash requires an application to parse the crafted source and interrupts that application without a reported data-access impact.

The record

CVE
CVE-2026-79590
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

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Technologies

Your stack

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Your stack

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