CVE-2026-44950

Katalog CVE

CVSS 9.0 · Critical EPSS 0,44%

Kerentanan Heap-based Buffer Overflow. Skor CVSS 3.1 9.0 (Critical) menurut suse.de.

Deskripsi (NVD)

fs_read_glyphs() in the libXfont2 font-server client (src/fc/fserve.c) copies each glyph's bitmap into a single buffer. Existing checks validates only that the source slice (position, length) lies within the source bitmap buffer. It does not check whether the running destination cursor has exceeded the allocation. A malicious font server can send overlapping source offsets -- for example 1000 glyphs each referencing {position:0, length:64} with nbytes=64. Each individual source range passes the existing validation, but the cumulative writes total 64000 bytes into a 64-byte destination buffer. This is a heap buffer overflow with attacker-controlled content.

Rincian

Terbit di NVD

10 September 2026

Terakhir diubah

10 September 2026

Status NVD

Awaiting Analysis

CVSS 3.1

9.0 (Critical), sumber suse.de
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-122: Heap-based Buffer Overflow

EPSS (30 hari)

0,44% peluang dieksploitasi; lebih tinggi dari 36,7% CVE lain

Produk dan versi terdampak

NVD belum mencantumkan data produk (CPE) untuk CVE ini. Produk yang terdampak biasanya disebut di deskripsi dan di advisory vendor pada daftar referensi.

Referensi dan perbaikan

• https://bugzilla.suse.com/show_bug.cgi?id=CVE-2026-44950