CVE-2026-88341

Application termination via zero-buffer compiled rule arena

Published Sep 22, 2026 · Updated Sep 22, 2026

A reachable assertion failure in YARA 4.5.8 allows attackers to terminate an application by supplying a crafted compiled rule file. The yr_arena_load_stream() path accepts a .yrc arena header with num_buffers set to zero, after which yr_arena_get_ptr() asserts that a requested buffer index is below the empty arena's buffer count. The application must load the attacker-supplied compiled rules; successful triggering aborts that process without establishing code execution or data access.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A reachable assertion failure in YARA 4.5.8 allows attackers to terminate an application by supplying a crafted compiled rule file. The yr_arena_load_stream() path accepts a .yrc arena header with num_buffers set to zero, after which yr_arena_get_ptr() asserts that a requested buffer index is below the empty arena's buffer count. The application must load the attacker-supplied compiled rules; successful triggering aborts that process without establishing code execution or data access.

The record

CVE
CVE-2026-88341
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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