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TI-2023-23512 Aliases CVE-2023-43826GHSA-hhj4-xc5f-6f87

Apache Guacamole: Integer overflow in handling of VNC image buffers

Priority MEDIUM 42CWE-190Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-190 and the CVSS impact.

Summary

Apache Guacamole 1.5.3 and older do not consistently ensure that values received from a VNC server will not result in integer overflow. If a user connects to a malicious or compromised VNC server, specially-crafted data could result in memory corruption, possibly allowing arbitrary code to be executed with the privileges of the running guacd process. Users are recommended to upgrade to version 1.5.4, which fixes this issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0089 59th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ApacheApache Guacamoleup to 1.5.3—No fix listedCNA
  • Apache Guacamole VendorApache Affected up to 1.5.3 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:apache:guacamole:*:*:*:*:*:*:*:*up to 1.5.3VulnerableApache
  • cpe:2.3:a:apache:guacamole:*:*:*:*:*:*:*:* Versions up to 1.5.3 Vulnerable ·Apache

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-43826
  2. 2026-10-03 Alias added: GHSA-hhj4-xc5f-6f87

References

Advisory 2

  • TI-2019-14123 SQLite 3.30.1 mishandles certain SELECT statements with a nonexistent VIEW, leading to an application crash. CVSS 3.1HIGH 7.5
  • TI-2021-19751 Improper validation of SAML responses CVSS 3.1HIGH 8.8
  • TI-2023-14404 Apache Guacamole: Use-after-free in handling of RDP audio input buffer CVSS 3.1HIGH 8.1
  • TI-2017-02374 Race condition in Apache Guacamole CVSS 3.0HIGH 8.1
  • TI-2018-01241 Prior to 1.0.0, Apache Guacamole used a cookie for client-side storage of the user's… CVSS 3.0HIGH 7.5
  • TI-2024-23239 Apache Guacamole: Improper input validation of console codes CVSS 3.1HIGH 7.5
See all 12 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences