Detections
Analytics

Echo: libxfont: security update to 1:2.0.6-1+deb13u1

critical Tenable Cloud Security Plugin ID 474350

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2026-44950)

Solution

Update the libxfont library and its related packages to version 1:2.0.6-1+deb13u1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-44950

Plugin Details

Severity: Critical

ID: 474350

Version: Revision 1.1

Type: Local

Published: 10/11/2026

Updated: 10/11/2026

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.41

CVSS v2

Risk Factor: High

Base Score: 7.6

Temporal Score: 5.6

Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-44950

CVSS v3

Risk Factor: Critical

Base Score: 9

Temporal Score: 7.8

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.5

Threat Score: 8.4

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 8/5/2026

Vulnerability Publication Date: 8/5/2026

Reference Information

CVE: CVE-2026-44950

IAVA: 2026-A-0817