CVE-2026-112398— Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution
Quick assessment
Affected
python-pillow Pillow
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Pillow 是一个 Python 图像处理库。在 13.0.0 版本之前，Pillow 的 FlashPix JPEG 分块（tile）解码器在解码扫描行时，可能将数据写入到已分配的分块缓冲区之外。具体而言，FlashPix（FPX）JPEG 解码会选用每像素 2 字节的原始模式 LA；然而，当遇到无法识别的 JPEG 模式时，系统可能将其解码为包含四个分量的 JCS_UNKNOWN 模式，导致 ImagingJpegDecode 将四分量扫描行写入原本仅为 2 字节设计的分块缓冲区。攻击者可构造一个 OLE2
Possible ATT&CK Techniques 1 AI
T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-112398
Vulnerability Information
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Vulnerability Title
Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| python-pillow | Pillow | < 13.0.0 | - |
|
II. Public POCs for CVE-2026-112398
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-112398 (1)
Vendor Advisories for CVE-2026-112398 (1)
Vendor Pages for CVE-2026-112398 (1)
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🔗 Release 13.0.0 · python-pillow/Pillow · GitHub x_refsource_MISC
Same Patch Batch · python-pillow · 2026-10-19 · 27 CVEs total
| CVE-2026-112393 | 9.2 CRITICAL | Pillow: Heap buffer overflow in _tiffWriteProc when saving TIFF to BytesIO |
| CVE-2026-112900 | 9.2 CRITICAL | Pillow: Argument Injection in Ghostscript call, potentially leading into RCE |
| CVE-2026-112403 | 9.2 CRITICAL | Pillow: Heap buffer overflow in ImagingJpegDecode |
| CVE-2026-112896 | 8.8 HIGH | Pillow: TIFF encoder ColorMap plane-size mismatch causes a heap out-of-bounds read |
| CVE-2026-112404 | 8.8 HIGH | Pillow: OOB read in TiffDecode.c tile and RGBA paths leaks heap memory into pixels |
| CVE-2026-112897 | 8.7 HIGH | Pillow: TiffDecode returns uninitialized memory as pixels for short JPEG strips |
| CVE-2026-112895 | 8.7 HIGH | Pillow: Unbounded recursion parsing a PDF page tree or trailer chain (incomplete fix for C |
| CVE-2026-112405 | 8.7 HIGH | Pillow: NULL pointer dereference in Image.merge via an unvalidated band 0 |
| CVE-2026-112892 | 8.7 HIGH | Pillow: MSP RLE decoder expands a tiny file into unbounded memory |
| CVE-2026-112406 | 8.7 HIGH | Pillow: Infinite loop in PdfParser.rewrite_pages on page tree Parent cycle |
| CVE-2026-112894 | 8.7 HIGH | Pillow: Quadratic-time DoS in PDF save_all (PdfParser.next_object_id) |
| CVE-2026-112400 | 8.7 HIGH | Pillow: GIF seek keeps rejected size after DecompressionBombError, allowing DoS |
| CVE-2026-112402 | 8.7 HIGH | Pillow: Double free in ImagingScaleAffine on calloc failure via Image.transform |
| CVE-2026-112397 | 8.7 HIGH | Pillow: Out-of-bounds access in _imagingmorph on a zero-width image |
| CVE-2026-112399 | 8.7 HIGH | Pillow: APNG background disposal allocates full canvas before decompression bomb check |
| CVE-2026-112392 | 8.2 HIGH | Pillow: NULL dereference in ImagingExpand via rank filters on zero-size images |
| CVE-2026-112390 | 8.2 HIGH | Pillow: Infinite loop in MIC n_frames when the embedded TIFF |
| CVE-2026-112893 | 8.2 HIGH | Pillow: Invalid free in FreeType glyph rendering when a stroker is active |
| CVE-2026-112901 | 6.9 MEDIUM | Pillow: ReDoS in XbmImagePlugin: 512-byte file stalls Image.open() for minutes |
| CVE-2026-112898 | 6.9 MEDIUM | Pillow: Image.quantize() with empty palette leaks uninitialized stack memory |
Showing top 20 of 27 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Pillow
-
CVE-2026-112901
Pillow: ReDoS in XbmImagePlugin: 512-byte file stalls Image. -
CVE-2026-112900
Pillow: Argument Injection in Ghostscript call, potentially -
CVE-2026-112898
Pillow: Image.quantize() with empty palette leaks uninitiali -
CVE-2026-112897
Pillow: TiffDecode returns uninitialized memory as pixels fo -
CVE-2026-112896
Pillow: TIFF encoder ColorMap plane-size mismatch causes a h
Same vendor: python-pillow
-
CVE-2026-112901
Pillow: ReDoS in XbmImagePlugin: 512-byte file stalls Image. -
CVE-2026-112900
Pillow: Argument Injection in Ghostscript call, potentially -
CVE-2026-112898
Pillow: Image.quantize() with empty palette leaks uninitiali -
CVE-2026-112897
Pillow: TiffDecode returns uninitialized memory as pixels fo -
CVE-2026-112896
Pillow: TIFF encoder ColorMap plane-size mismatch causes a h
Same weakness: CWE-122
V. Comments for CVE-2026-112398
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