Detections
Analytics
TencentOS Server 4: python-pillow (TSSA-2026:1206)
critical Nessus Plugin ID 373423
Synopsis
The remote TencentOS Server 4 host is missing one or more security updates.Description
The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2026:1206 advisory.Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:
CVE-2026-112405:
A flaw was found in Pillow. A remote attacker can cause a Denial of Service (DoS) by supplying a specially crafted image file to an application that processes images with the library. This issue occurs because the Image.merge() function fails to properly validate the first input band, allowing mismatched image storage formats to trigger a null pointer dereference. Consequently, processing the malformed image causes the native application process to crash.
CVE-2026-112398:
Pillow is a Python imaging library. Prior to 13.0.0, Pillow's FlashPix JPEG-tile decoder can write decoded scanlines beyond the allocated tile buffer. FlashPix (FPX) JPEG decoding selects raw mode LA with two bytes per pixel, while an unrecognized JPEG mode can be decoded as JCS_UNKNOWN with four components, causing ImagingJpegDecode to write four-component scanlines into the two-byte tile buffer. An attacker can supply a crafted OLE2 FlashPix file to an application with the optional olefile dependency installed that opens or thumbnails untrusted input. This can corrupt heap memory and may allow arbitrary code execution.
This issue is fixed in version 13.0.0.
CVE-2026-112393:
Pillow is a Python imaging library. From 2.0.0 until 13.0.0, Pillow has a heap buffer overflow and stale- heap disclosure in _tiffWriteProc when saving compressed TIFF data through libtiff to a target without a usable fileno(), such as BytesIO. The callback sizes its allocation from the prior buffer size instead of the current write position, allowing an attacker-controlled out-of-line TIFF tag or retained ICC profile to be copied beyond the allocation after libtiff seeks forward. This overflow can crash the process and may allow code execution. Independently, unwritten alignment gaps in compressed TIFF output larger than 64 KiB can disclose stale heap bytes without a crafted tag. File paths and targets with real file descriptors are unaffected. This issue is fixed in version 13.0.0.
Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Update the affected packages.See Also
Plugin Details
Severity: Critical
ID: 373423
File Name: tencentos_TSSA_2026_1206.nasl
Version: 1.1
Type: Local
Family: Tencent Local Security Checks
Published: 10/28/2026
Updated: 10/28/2026
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.9
Percentile: 96.35
CVSS v2
Risk Factor: Critical
Base Score: 10
Temporal Score: 7.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2026-112398
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Temporal Score: 8.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
CVSS v4
Risk Factor: Critical
Base Score: 9.2
Threat Score: 8.2
Threat Vector: CVSS:4.0/E:P
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
CPE: cpe:/o:tencent:tencentos_server:4, p-cpe:/a:tencent:tencentos_server:python-pillow
Required KB Items: Host/local_checks_enabled, Host/etc/os-release, Host/TencentOS/rpm-list, Host/cpu
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 10/26/2026
Vulnerability Publication Date: 10/19/2026