CVE-2026-3257Public exploit

Application crash via bundled heap buffer over-read

Published Mar 5, 2026 · Updated Mar 5, 2026

Vulnerable dependency use in Tokuhiro Matsuno UnQLite 0.06 and earlier leaves applications with a bundled heap-based overflow. The linked upstream flaw makes jx9MemObjStore read four bytes before its allocated operand-stack region while processing a crafted JX9 script. The reproducer requires local script execution, and the Perl binding omits document-store features, so reachability through the binding remains unverified.

CVSS severity9.8
Critical
EPSS probability0.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Vulnerable dependency use in Tokuhiro Matsuno UnQLite 0.06 and earlier leaves applications with a bundled heap-based overflow. The linked upstream flaw makes jx9MemObjStore read four bytes before its allocated operand-stack region while processing a crafted JX9 script. The reproducer requires local script execution, and the Perl binding omits document-store features, so reachability through the binding remains unverified.

The record

CVE
CVE-2026-3257
Published
Mar 5, 2026
Updated
Mar 5, 2026
Vendor
Tokuhiro Matsuno
Product
UnQLite
Classifications
CWE-1395
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 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=0 <=0.06

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Tokuhiro Matsuno · UnQLiteversion=0 <=0.06

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

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No observations available

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

Weakness, pattern, technique

CWE-1395Dependency on Vulnerable Third-Party Component

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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