Libsoup: libsoup: heap buffer overflow during websocket client-frame masking
CVSS score
8.6
EPSS probability
%0.4
Risk score
0.0
Published
18 d ago
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Vulnerability description
DayBreach CVE AI Research
CVE-2026-102559 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.
A flaw was found in libsoup. When constructing a masked WebSocket client frame for a very large outgoing payload, size values passed to GByteArray allocation APIs could be truncated while the masking routine still used the full length, causing a heap buffer overflow.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-102559 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | Red Hat | Red Hat Enterprise Linux 10 | View |
| 2 | Red Hat | Red Hat Enterprise Linux 9 | View |
| 3 | Red Hat | Red Hat Enterprise Linux 6 | View |
| 4 | Red Hat | Red Hat Enterprise Linux 7 | View |
| 5 | Red Hat | Red Hat Enterprise Linux 8 | View |
| 6 | gnome | libsoup | View |
| 7 | redhat | enterprise linux | View |
| 8 | redhat | enterprise linux | View |
| 9 | redhat | enterprise linux | View |
| 10 | redhat | enterprise linux | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 8.6 | CVSS V3_1 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H | CVE CNA |
| 8.6 | CVSS V31 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H | NVD |
| 8.6 | CVSS 3.x | — | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H | Microsoft MSRC |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-102559 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-102559 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
Similar Vulnerabilities
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