Detections
Analytics

Echo: expat: security update to 2.8.4-2+e3

high Tenable Cloud Security Plugin ID 473644

Description

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

 - libexpat before commit 13c5f63 contains a heap buffer over-read vulnerability in xmlparse.c.
 XML_ParseBuffer advances the parse buffer end with parser->m_bufferEnd += len using a caller-supplied
 length that is not validated against the allocated buffer size, so repeated XML_ParseBuffer calls move
 m_bufferEnd past the end of the heap allocation and subsequent parsing reads out of bounds. Reaching this
 path requires a parse buffer to already be present; otherwise XML_ParseBuffer returns XML_ERROR_NO_BUFFER.
 A buffer is present after a prior call to XML_GetBuffer, either directly (the common case) or indirectly
 through a prior XML_Parse call that allocates the buffer internally. The over-read discloses adjacent heap
 memory to the calling application, recovering heap pointers, libc function pointers, and code pointers
 sufficient to defeat ASLR and build further exploitation primitives. (CVE-2026-77214)

Solution

Update the expat library and its related packages to version 2.8.4-2+e3 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-77214

Plugin Details

Severity: High

ID: 473644

Version: Revision 1.1

Type: Local

Published: 10/7/2026

Updated: 10/7/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.41

CVSS v2

Risk Factor: High

Base Score: 8.5

Temporal Score: 6.3

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

CVSS Score Source: CVE-2026-77214

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.1

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

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

CVSS v4

Risk Factor: High

Base Score: 8.3

Threat Score: 4.8

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 10/6/2026

Vulnerability Publication Date: 10/7/2026

Reference Information

CVE: CVE-2026-77214