Detections
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Alpine: expat: security update to 2.9.0-r0

high Tenable Self-Hosted Container Security Plugin ID 476120

Description

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

 - libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc()
 function on 32-bit platforms when computing allocation sizes. Attackers supplying malicious XML to
 applications parsing with vulnerable libexpat can cause heap buffer overflow, memory corruption, or denial
 of service. (CVE-2026-102633)

 - 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 2.9.0-r0 or later.

See Also

https://security.alpinelinux.org/vuln/CVE-2026-102633

https://security.alpinelinux.org/vuln/CVE-2026-77214

Plugin Details

Severity: High

ID: 476120

Version: Revision 1.1

Type: Local

Published: 10/17/2026

Updated: 10/17/2026

Supported Sensors: Agentless Assessment

Risk Information

VPR

Risk Factor: Low

Score: 3.5

Percentile: 51.52

CVSS v2

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4

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

CVSS Score Source: CVE-2026-102633

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 Score Source: CVE-2026-77214

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

CVSS Score Source: CVE-2026-77214

Vulnerability Information

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 9/29/2026

Reference Information

CVE: CVE-2026-102633, CVE-2026-77214

IAVA: 2026-A-1100