CVE-2026-102559
Public on 2026-09-29
Modified on 2026-10-01
Description
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.
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 2 - Core | libsoup | 2026-10-12 | ALAS2-2026-3998 | Fixed |
| Amazon Linux 2023 | libsoup | 2026-10-12 | ALAS2023-2026-3212 | Fixed |
| Amazon Linux 2023 | libsoup3 | Pending Fix | ||
| Amazon Linux 2027 Preview | libsoup3 | 2026-10-21 | ALAS2027-2026-209 | Fixed |
CVSS Scores
| Score Type | Score | Vector | |
|---|---|---|---|
| Amazon Linux | CVSSv3 | 6.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H |
| NVD | CVSSv3 | 8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H |