CVE-2026-59140

Memory disclosure and crash via unchecked node indices

Published Jul 21, 2026 · Updated Jul 21, 2026

Out-of-bounds reads in Data::SortedSet::Shared before 0.03 allow local users to disclose adjacent memory or crash a process via a crafted backing file. The attach-time ss_validate_header check bounds only root, while rank and min/max paths trust children[], leftmost, and rightmost indices from the mapped file without checking node_capacity. Exploitation requires write access to a backing file; files default to owner-only mode 0600, and cross-user exposure requires an explicitly permissive mode.

CVSS severity9.1
Critical
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds reads in Data::SortedSet::Shared before 0.03 allow local users to disclose adjacent memory or crash a process via a crafted backing file. The attach-time ss_validate_header check bounds only root, while rank and min/max paths trust children[], leftmost, and rightmost indices from the mapped file without checking node_capacity. Exploitation requires write access to a backing file; files default to owner-only mode 0600, and cross-user exposure requires an explicitly permissive mode.

The record

CVE
CVE-2026-59140
Published
Jul 21, 2026
Updated
Jul 21, 2026
Vendor
Yegor Korablev
Product
Data::SortedSet::Shared
Classifications
CWE-125, T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 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?

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  1. Affected versionversion=0 <0.03

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Yegor Korablev · Data::SortedSet::Sharedversion=0 <0.03

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation

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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