CVE-2026-88340

Application crash via invalid external-variable pointers

Published Sep 22, 2026 · Updated Sep 22, 2026

Memory corruption in YARA 4.5.8 allows attackers to crash applications by supplying a crafted compiled .yrc rule file. During deserialization, insufficient validation leaves external-variable pointers able to reach yr_rules_destroy() as invalid allocations or yr_object_create() as wild references. Exploitation requires an application to load the attacker-supplied compiled rules; the documented consequence is memory corruption followed by an application crash.

CVSS severityUnavailable
Unscored
EPSS probability0.25%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in YARA 4.5.8 allows attackers to crash applications by supplying a crafted compiled .yrc rule file. During deserialization, insufficient validation leaves external-variable pointers able to reach yr_rules_destroy() as invalid allocations or yr_object_create() as wild references. Exploitation requires an application to load the attacker-supplied compiled rules; the documented consequence is memory corruption followed by an application crash.

The record

CVE
CVE-2026-88340
Published
Sep 22, 2026
Updated
Sep 22, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 22, 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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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