Detections
Analytics

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

critical Tenable Cloud Security Plugin ID 474346

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) indexes the per-character
 encoding[] array using num_chars from the FS_QueryXBitmaps16 reply, but that array was allocated with a
 size derived from num_extents in the separate FS_QueryXExtents16 reply. The two CARD32 fields are never
 cross-checked. A malicious or compromised font server can send a small num_extents (e.g. 1) in the extents
 reply, then a large num_chars (e.g. 100000) in the bitmaps reply. This causes attacker-controlled out-of-
 bounds heap read and writes. (CVE-2026-59679)

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-2026-59679

Plugin Details

Severity: Critical

ID: 474346

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-2026-59679

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: 9.2

Threat Score: 7.2

Threat Vector: CVSS:4.0/E:U

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

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-2026-59679

IAVA: 2026-A-0817