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CVE-2026-112403— Pillow: Heap buffer overflow in ImagingJpegDecode

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 JPEG 解码器可能将整行扫描数据写入一个仅按请求的草稿缩放比例（draft scale）分配大小的缓冲区中。ImagingJpegDecode 在请求缩放后，未验证 libjpeg 实际输出的图像宽度及分量数量。因此，当使用链接了 libjpeg-turbo 3.x 构建的 Pillow 解码一个 8 位无损 SOF3 格式的 JPEG 文件时，该文件可能忽略请求的下采样几何尺寸。攻击者可向使用了 draft() 或 t

CVSS 9.2 · Critical
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I. Basic Information for CVE-2026-112403

Vulnerability Information
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Vulnerability Title
Pillow: Heap buffer overflow in ImagingJpegDecode
Source: CVE Program / CVE List V5
Vulnerability Description
Pillow is a Python imaging library. Prior to 13.0.0, Pillow's JPEG decoder can write a full-width scanline into a buffer sized for a requested draft scale. ImagingJpegDecode does not verify libjpeg's actual output width and component count after scaling is requested, and an 8-bit lossless SOF3 JPEG decoded by a build linked to libjpeg-turbo 3.x can ignore the requested downscaling geometry. An attacker can supply such a JPEG to an application that uses draft() or thumbnail() to request downscaling. This can corrupt heap memory, crash the process, or potentially allow code execution. Older libjpeg-turbo 2.x and IJG builds reject the SOF3 input. 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-2026-112403

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III. Intelligence Information for CVE-2026-112403

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Patches & Fixes for CVE-2026-112403 (1)

Vendor Pages for CVE-2026-112403 (1)

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-2026-112398 9.2 CRITICAL Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution
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-2026-112894 8.7 HIGH Pillow: Quadratic-time DoS in PDF save_all (PdfParser.next_object_id)
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-2026-112897 8.7 HIGH Pillow: TiffDecode returns uninitialized memory as pixels for short JPEG strips
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-2026-112898 6.9 MEDIUM Pillow: Image.quantize() with empty palette leaks uninitialized stack memory
CVE-2026-112901 6.9 MEDIUM Pillow: ReDoS in XbmImagePlugin: 512-byte file stalls Image.open() for minutes

Showing top 20 of 27 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Pillow
Same vendor: python-pillow
Same weakness: CWE-122

V. Comments for CVE-2026-112403

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