CVE-2026-128321 Tight JPEG decoding in TightVNC and UltraVNC viewers contains a heap-based buffer overflow vulnerability

Tight JPEG decoding in TightVNC and UltraVNC viewers contains a heap-based buffer overflow because an attacker-controlled framebuffer rectangle width is not validated against a fixed-size decoding buffer. A malicious VNC server can cause an out-of-bounds heap write when a user connects, resulting...

CVE-2026-128321

The TightVNC and UltraVNC viewers are susceptible to a heap-based buffer overflow within the Tight JPEG decoding component. The vulnerability exists because the software fails to validate an attacker-controlled framebuffer rectangle width against a fixed-size decoding buffer. A malicious VNC serv...

PT-2026-146110

Tight JPEG decoding in TightVNC and UltraVNC viewers contains a heap-based buffer overflow because an attacker-controlled framebuffer rectangle width is not validated against a fixed-size decoding buffer. A malicious VNC server can cause an out-of-bounds heap write when a user connects, resulting...

Critical: Red Hat Security Advisory: python-pillow security update

An update for python-pillow is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service. Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability Scorin...

pillow: Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution

A flaw was found in Pillow. A remote attacker can achieve arbitrary code execution by supplying a specially crafted FlashPix FPX image file to an application that processes untrusted inputs. Due to improper handling of image tile data during JPEG decoding, the library writes pixel data beyond the...

pillow: Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution

A flaw was found in Pillow. A remote attacker can achieve arbitrary code execution by supplying a specially crafted FlashPix FPX image file to an application that processes untrusted inputs. Due to improper handling of image tile data during JPEG decoding, the library writes pixel data beyond the...

Critical: Red Hat Security Advisory: python-pillow security update

An update for python-pillow is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On. Red Hat Product Security has rated this update as having a security impact of Critical. A Common...

pillow: Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution

A flaw was found in Pillow. A remote attacker can achieve arbitrary code execution by supplying a specially crafted FlashPix FPX image file to an application that processes untrusted inputs. Due to improper handling of image tile data during JPEG decoding, the library writes pixel data beyond the...

RHEL 8 : python-pillow (RHSA-2026:98109)

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:98109 advisory. Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level...

RHEL 8 : python-pillow (RHSA-2026:98111)

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:98111 advisory. Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level...

pillow: Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution

A flaw was found in Pillow. A remote attacker can achieve arbitrary code execution by supplying a specially crafted FlashPix FPX image file to an application that processes untrusted inputs. Due to improper handling of image tile data during JPEG decoding, the library writes pixel data beyond the...

pillow: Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution

A flaw was found in Pillow. A remote attacker can achieve arbitrary code execution by supplying a specially crafted FlashPix FPX image file to an application that processes untrusted inputs. Due to improper handling of image tile data during JPEG decoding, the library writes pixel data beyond the...

pillow: Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution

A flaw was found in Pillow. A remote attacker can achieve arbitrary code execution by supplying a specially crafted FlashPix FPX image file to an application that processes untrusted inputs. Due to improper handling of image tile data during JPEG decoding, the library writes pixel data beyond the...

Oracle Linux 8 : python-pillow (ELSA-2026-93077)

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-93077 advisory. - CVE-2026-112900 python-pillow: Pillow: Argument Injection in Ghostscript call, potentially leading into RCE Resolves: RHEL-295960 - CVE-2026-112398...

MiracleLinux 8 : python-pillow-5.1.1-36.el8_10 (AXSA:2026-2231:03)

The remote MiracleLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2026-2231:03 advisory. pillow: Pillow: Heap buffer overflow in tiffWriteProc when saving TIFF to BytesIO CVE-2026-112393 pillow: Pillow: Heap buffer overflow in FlashPix F...

pillow: Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution

A flaw was found in Pillow. A remote attacker can achieve arbitrary code execution by supplying a specially crafted FlashPix FPX image file to an application that processes untrusted inputs. Due to improper handling of image tile data during JPEG decoding, the library writes pixel data beyond the...

CVE-2026-112398

A flaw was found in Pillow. A remote attacker can achieve arbitrary code execution by supplying a specially crafted FlashPix FPX image file to an application that processes untrusted inputs. Due to improper handling of image tile data during JPEG decoding, the library writes pixel data beyond the...

pillow: Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution

A flaw was found in Pillow. A remote attacker can achieve arbitrary code execution by supplying a specially crafted FlashPix FPX image file to an application that processes untrusted inputs. Due to improper handling of image tile data during JPEG decoding, the library writes pixel data beyond the...

BIT-PILLOW-2026-112398 Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution

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 JCSUNKNOWN with four...

Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution

Credits Researcher: Alex Bouffard [email protected] Summary A heap buffer overflow in Pillow's FlashPix FPX JPEG-tile decoder lets an attacker achieve arbitrary code execution by getting an application to open a single crafted file with Image.open. The file is recognized by content the OLE2...