CVE-2025-40914

Code execution or crash via negative growth size

Published Jun 11, 2025 · Updated Jun 11, 2025

Integer overflow in bundled LibTomMath in CryptX 0.002 through 0.086 allows attackers to execute arbitrary code or crash a process. LibTomMath's mp_grow routine fails to reject a negative requested size before calculating and reallocating the digit buffer. Reachability depends on a consuming Perl program passing attacker-influenced values into affected big-integer operations; the CryptX advisory identifies no exposed API path.

CVSS severity9.8
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

Integer overflow in bundled LibTomMath in CryptX 0.002 through 0.086 allows attackers to execute arbitrary code or crash a process. LibTomMath's mp_grow routine fails to reject a negative requested size before calculating and reallocating the digit buffer. Reachability depends on a consuming Perl program passing attacker-influenced values into affected big-integer operations; the CryptX advisory identifies no exposed API path.

The record

CVE
CVE-2025-40914
Published
Jun 11, 2025
Updated
Jun 11, 2025
Vendor
DCIT, a.s.
Product
CryptX
Classifications
CWE-1395
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jun 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 11, 2025Record 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=0.002 <=0.086

What conditions does exploitation require?

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

What is affected?

DCIT, a.s. · CryptXversion=0.002 <=0.086

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1395Dependency on Vulnerable Third-Party Component

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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