CVE-2026-109833

Status: Awaiting AnalysisMedium (5.9)—

Severity5.9Medium · CVSS 3.1

Exploitation probability0.37 %higher than 29% of CVEs

Active exploitationNonot in the CISA catalog

Public exploitNot knownno public code found

A flaw was found in gnome-remote-desktop as shipped in Red Hat Enterprise Linux. In the VNC TLS read path, partial consumption of the internal peek buffer incorrectly moves remaining peeked bytes into the caller-supplied buffer instead of compacting the peek buffer. A remote attacker who can reach an enabled VNC TLS listener and trigger a peek/read size mismatch can cause an out-of-bounds write, leading to denial of service.

CVSS

Base score: 5.9
Version: 3.1
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.37 %
Percentile among all scored CVEs: 29
Score date: 10/20/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1190 Exploit Public-Facing Applicationinitial access75 %
Primary impactT1499.004 Application or System Exploitationimpact80 %

Vulnerabilidad de escritura fuera de límites (CWE-121) en VNC TLS accesible remotamente sin autenticación (AV:N, PR:N). Causa DoS por corrupción de memoria (peek buffer). Vector CVSS apunta a red sin privilegios; impacto es negación de servicio (A:H).

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

ATT&CK mitigations that cover these techniques

Filter Network Traffic Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Application Isolation and Sandboxing

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Gnome — Gnome Remote Desktop^AI

CWEs

CWE-121

References

Show 2 references

Raw JSON (NVD)

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{
  "id": "CVE-2026-109833",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
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          "options": [
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            {
              "automatable": "no"
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              "technicalImpact": "partial"
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          "version": "2.0.3",
          "timestamp": "2026-10-14T13:58:30.966963Z"
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          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
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          "cpes": [
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          "packageName": "gnome-remote-desktop",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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  "published": "2026-10-13T13:17:29.430",
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      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2550367",
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    {
      "lang": "en",
      "value": "A flaw was found in gnome-remote-desktop as shipped in Red Hat Enterprise Linux. In the VNC TLS read path, partial consumption of the internal peek buffer incorrectly moves remaining peeked bytes into the caller-supplied buffer instead of compacting the peek buffer. A remote attacker who can reach an enabled VNC TLS listener and trigger a peek/read size mismatch can cause an out-of-bounds write, leading to denial of service."
    }
  ],
  "lastModified": "2026-10-15T16:33:26.290",
  "sourceIdentifier": "secalert@redhat.com"
}