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CVE-2026-112894— Pillow: Quadratic-time DoS in PDF save_all (PdfParser.next_object_id)

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 5.1.0 到 13.0.0 版本之间，当启用选项保存多帧图像时，Pillow 在预留 PDF 对象标识符时会消耗二次方时间。其方法在为每个对象处理时，都会重复重建并扫描所有先前已预留的标识符。攻击者可向将图像转换为多页 PDF 的应用程序提交多帧图像（例如一个帧数声明值很大的小型 APNG 文件），从而引发过度 CPU 消耗并导致拒绝服务（DoS）。该问题已在 13.0.0 版本中修复。

CVSS 8.7 · High Updated Oct 20, 2026

Possible ATT&CK Techniques 2 AI

T1499.001 · OS Exhaustion Flood T1499.003 · Application Exhaustion Flood

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Vulnerability Information

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Vulnerability Title

Pillow: Quadratic-time DoS in PDF save_all (PdfParser.next_object_id)

Source: CVE Program / CVE List V5

Vulnerability Description

Pillow is a Python imaging library. From 5.1.0 until 13.0.0, Pillow takes quadratic time to reserve PDF object identifiers when saving many frames with save_all enabled. PdfParser.next_object_id() repeatedly rebuilds and scans all previously reserved identifiers for every object. An attacker can supply a multi-frame image, including a small APNG with a large declared frame count, to an application that converts it to a multipage PDF. This can consume excessive CPU and deny service. This issue is fixed in version 13.0.0.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Source: CVE Program / CVE List V5

Vulnerability Type

算法复杂性

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
python-pillow	Pillow	>= 5.1.0, < 13.0.0	-

II. Public POCs for CVE-2026-112894

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-112894

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Other References for CVE-2026-112894 (3)

https://github.com/python-pillow/Pillow/releases/tag/13.0.0 x_refsource_MISC
https://github.com/python-pillow/Pillow/security/advisories/GHSA-jg86-v3jv-hrpm x_refsource_CONFIRM
https://github.com/python-pillow/Pillow/commit/f6a852555f1a1bdff7781abf25f1a3b8bd6ce6cb x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2026-112894

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-2026-112403	9.2 CRITICAL	Pillow: Heap buffer overflow in ImagingJpegDecode
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-2026-112895	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-2026-112399	8.7 HIGH	Pillow: APNG background disposal allocates full canvas before decompression bomb check
CVE-2026-112397	8.7 HIGH	Pillow: Out-of-bounds access in _imagingmorph on a zero-width image
CVE-2026-112402	8.7 HIGH	Pillow: Double free in ImagingScaleAffine on calloc failure via Image.transform
CVE-2026-112400	8.7 HIGH	Pillow: GIF seek keeps rejected size after DecompressionBombError, allowing DoS
CVE-2026-112897	8.7 HIGH	Pillow: TiffDecode returns uninitialized memory as pixels for short JPEG strips
CVE-2026-112406	8.7 HIGH	Pillow: Infinite loop in PdfParser.rewrite_pages on page tree Parent cycle
CVE-2026-112893	8.2 HIGH	Pillow: Invalid free in FreeType glyph rendering when a stroker is active
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-2026-112898	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 → →

IV. Related Vulnerabilities

Same product: Pillow

Same vendor: python-pillow

Same weakness: CWE-407

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2026-112894— Pillow: Quadratic-time DoS in PDF save_all (PdfParser.next_object_id)

Quick assessment

Possible ATT&CK Techniques 2 AI

I. Basic Information for CVE-2026-112894

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-112894

III. Intelligence Information for CVE-2026-112894

Other References for CVE-2026-112894 (3)

Same Patch Batch · python-pillow · 2026-10-19 · 27 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2026-112894

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