CVE-2023-40359

Unspecified impact via malformed ReGIS character-set names

Published Aug 14, 2023 · Updated Oct 9, 2024

A pointer/overflow issue in xterm before 380 allows local users to cause unspecified impact via malformed ReGIS character-set names. The ReGIS reporting path accepts character-set names containing characters outside the alphanumeric-and-underscore allowlist, creating the pointer/overflow condition. The path exists only in builds compiled with the experimental ReGIS feature; public sources do not specify the concrete runtime consequence.

CVSS severity9.8
Critical
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A pointer/overflow issue in xterm before 380 allows local users to cause unspecified impact via malformed ReGIS character-set names. The ReGIS reporting path accepts character-set names containing characters outside the alphanumeric-and-underscore allowlist, creating the pointer/overflow condition. The path exists only in builds compiled with the experimental ReGIS feature; public sources do not specify the concrete runtime consequence.

The record

CVE
CVE-2023-40359
Published
Aug 14, 2023
Updated
Oct 9, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 9, 2024Record 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 vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.3SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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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