CVE-2025-11463

Code execution via XE parser integer overflow

Published Oct 29, 2025 · Updated Oct 29, 2025

Integer overflow in Ashlar-Vellum Cobalt 12.2.1204.97 allows remote attackers to execute code by opening a crafted XE file. The XE file parser fails to validate user-supplied size data, allowing an integer overflow before buffer allocation. Exploitation requires a user to visit a malicious page or open the file, after which code runs with the privileges of the current process.

CVSS severity7.8
High
EPSS probability0.19%
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 Ashlar-Vellum Cobalt 12.2.1204.97 allows remote attackers to execute code by opening a crafted XE file. The XE file parser fails to validate user-supplied size data, allowing an integer overflow before buffer allocation. Exploitation requires a user to visit a malicious page or open the file, after which code runs with the privileges of the current process.

The record

CVE
CVE-2025-11463
Published
Oct 29, 2025
Updated
Oct 29, 2025
Vendor
Ashlar-Vellum
Product
Cobalt
Classifications
CWE-190, T1203, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 29, 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=1204.97

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Ashlar-Vellum · Cobaltversion=1204.97

Published CVSS scores

7.8Zero Day InitiativeCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1203Exploitation for Client Execution
T1204.002User Execution: Malicious File

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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