SUSE-SU-2026:3803-1
Vulnerability from csaf_suse - Published: 2026-08-25 18:48 - Updated: 2026-09-17 16:43Summary
Security update for LibVNCServer
Severity
Important
Notes
Title of the patch: Security update for LibVNCServer
Description of the patch: This update for LibVNCServer fixes the following issue:
- CVE-2026-50538: a malicious (or man-in-the-middle) VNC server can force a connecting `libvncclient` to write attacker-
controlled data past the end of its framebuffer (bsc#1276218).
Patchnames: SUSE-2026-3803,SUSE-SLE-Module-Packagehub-Subpackages-15-SP7-2026-3803
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
8.8 (High)
Affected products
Recommended
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise Module for Package Hub 15 SP7:libvncserver0-0:0.9.10-150000.4.41.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Module for Package Hub 15 SP7:libvncserver0-0:0.9.10-150000.4.41.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Module for Package Hub 15 SP7:libvncserver0-0:0.9.10-150000.4.41.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Module for Package Hub 15 SP7:libvncserver0-0:0.9.10-150000.4.41.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
important
References
8 references
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"text": "This update for LibVNCServer fixes the following issue:\n\n- CVE-2026-50538: a malicious (or man-in-the-middle) VNC server can force a connecting `libvncclient` to write attacker-\n controlled data past the end of its framebuffer (bsc#1276218).\n",
"title": "Description of the patch"
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},
{
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"url": "https://lists.suse.com/pipermail/sle-security-updates/2026-August/028571.html"
},
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"vulnerabilities": [
{
"cve": "CVE-2026-50538",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-50538"
}
],
"notes": [
{
"category": "general",
"text": "LibVNCClient is a library for easy implementation of a VNC client. In versions 0.9.12 through 0.9.15, a malicious (or man-in-the-middle) VNC server can force a connecting `libvncclient` to write attacker-controlled data past the end of its framebuffer. This is an out-of-bounds heap write with attacker-controlled length, contents, and offset. It needs no authentication (the attacker\nis the server), works in a default build with default settings, and fires from a single `FramebufferUpdate` the moment the victim connects. It crashes any client unconditionally (denial of service); we also demonstrated it overwriting an application callback pointer and redirecting execution to attacker-chosen code (code execution) under the default configuration. Commit 540332be3e0acc566fa64da6f1b4680c72c724dd patches the issue.",
"title": "CVE description"
}
],
"product_status": {
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"references": [
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"summary": "CVE-2026-50538",
"url": "https://www.suse.com/security/cve/CVE-2026-50538"
},
{
"category": "external",
"summary": "SUSE Bug 1276218 for CVE-2026-50538",
"url": "https://bugzilla.suse.com/1276218"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
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]
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"products": [
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]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-25T18:48:49Z",
"details": "important"
}
],
"title": "CVE-2026-50538"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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