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Back to active CVEs
Medium · CVSS 5.9CVE-2026-109833

Gnome-remote-desktop: heap buffer overflow in gnome-remote-desktop vnc tls peek buffer handling allows remote denial of serviceCVE-2026-109833

Answer in brief

CVE-2026-109833 records a Medium severity (CVSS 5.9) vulnerability in Gnome-remote-desktop: heap buffer overflow in gnome-remote-desktop vnc tls peek buffer handling allows remote denial of service. The current sources do not mark it as known exploited. The current feed maps Red Hat/gnome-remote-desktop (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 13, 2026Updated Oct 13, 2026Source checked Oct 13, 2026First seen by HOL Oct 13, 2026Material review Oct 13, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.9
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 5.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/gnome-remote-desktop (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/gnome-remote-desktopgeneric*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/gnome-remote-desktop.
  2. 2Review the reported fix. Source-reported workaround: If VNC is not required, disable the gnome-remote-desktop VNC service. If it must remain enabled, restrict the VNC listener to trusted hosts or management networks using host-based firewall rules.

Evidence timeline and material changes

  1. Published upstream

    Oct 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 13, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • QAPI stack-based buffer overflowAlso CWE-121
  • UEFI OOB Write and Buffer Overflow VulnerabilitiesSame generic ecosystem
  • UEFI OOB Write and Buffer Overflow VulnerabilitiesSame generic ecosystem
  • UEFI OOB Write and Buffer Overflow VulnerabilitiesSame generic ecosystem
  • UEFI OOB Write and Buffer Overflow VulnerabilitiesSame generic ecosystem
  • Uncleared Password Keystrokes VulnerabilitySame generic ecosystem

Record context

Vulnerability class
Buffer Overflow
EPSS
Not reported
CWE IDs
CWE-121
Source
CVE List V5
Source checked
Oct 13, 2026
References
2 linked sources
Open source record