Buffer overflow in Red Hat Enterprise Linux 10
CVE-2026-59691
A heap buffer overflow vulnerability was found in GStreamer's rfbsrc plugin. When a client connects to a malicious RFB/VNC server that advertises a 16bpp framebuffer and sends Hextile-encoded updates, the Hextile background fill path writes 32-bit pixel values into a buffer allocated for 16-bit pixels. This type mismatch causes an out-of-bounds heap write that can lead to denial of service (process crash) and potential memory corruption.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H.
EPSS exploit prediction
EPSS: 0.006 (46.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.006 · change: +0.003
Affected products
- Red Hat Enterprise Linux 10 — versions 0:1.26.7-2.el10_2.6
- Red Hat Enterprise Linux 10.0 Extended Update Support — versions 0:1.24.11-3.el10_0.6
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 7 Extended Lifecycle Support — versions 0:1.10.4-7.el7_9
- Red Hat Enterprise Linux 8 — versions 0:1.16.1-9.el8_10.1
- Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support — versions 0:1.16.1-4.el8_6.4
- Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On — versions 0:1.16.1-4.el8_6.4
- Red Hat Enterprise Linux 8.8 Telecommunications Update Service — versions 0:1.16.1-4.el8_8.4
- Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions — versions 0:1.16.1-4.el8_8.4
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-59691 (vdb-entry)
- RHBZ#2497343 (issue-tracking)
- gitlab.freedesktop.org/gstreamer/gstreamer-security/-/merge_requests/100
- gitlab.freedesktop.org/gstreamer/gstreamer/-/work_items/5173
- RHSA-2026:47180 (vendor-advisory)
- RHSA-2026:47731 (vendor-advisory)
- RHSA-2026:47179 (vendor-advisory)
- RHSA-2026:54658 (vendor-advisory)
- RHSA-2026:54660 (vendor-advisory)
- RHSA-2026:54659 (vendor-advisory)
Frequently asked questions
- What is CVE-2026-59691?
- CVE-2026-59691 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Out-of-bounds Write. CVSS score: 7.1/10. Published 2026-07-09.
- How severe is CVE-2026-59691?
- High severity. CVSS v3 base score is 7.1 out of 10.