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CVE-2026-112391— Pillow: PdfParser can recurse without limit in get_value() and linearize_page_tree()

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，Pillow 的方法在读取嵌套 PDF 对象时可能无限制地进行递归。当以“追加”模式打开现有 PDF 文件时，解析器会跟随攻击者控制的数组和字典进行解析。攻击者可以向启用了 PDF 追加保存功能的应用程序提交一个深度嵌套的 PDF 文件，从而触发未捕获的或导致工作进程终止，造成拒绝服务（DoS）。该问题已在 13.0.0 版本中修复。

CVSS 6.3 · Medium Updated Oct 20, 2026

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

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Vulnerability Information

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Vulnerability Title

Pillow: PdfParser can recurse without limit in get_value() and linearize_page_tree()

Source: CVE Program / CVE List V5

Vulnerability Description

Pillow is a Python imaging library. From 5.1.0 until 13.0.0, Pillow's PdfParser.get_value() can recurse without a limit while reading nested PDF objects. The parser follows attacker-controlled arrays and dictionaries when an existing PDF is opened for append. An attacker can provide a deeply nested PDF to an application that saves an image with PDF append enabled. This can raise an uncaught RecursionError or terminate the worker, causing denial of 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:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Source: CVE Program / CVE List V5

Vulnerability Type

不可达退出条件的循环(无限循环)

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-2026-112391

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-112391

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Other References for CVE-2026-112391 (3)

https://github.com/python-pillow/Pillow/releases/tag/13.0.0 x_refsource_MISC
https://github.com/python-pillow/Pillow/security/advisories/GHSA-254f-3936-288h x_refsource_CONFIRM
https://github.com/python-pillow/Pillow/commit/94cb11c44ff7345414da17ebfea1598a529ad9cd x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2026-112391

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-2026-112398	9.2 CRITICAL	Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution
CVE-2026-112404	8.8 HIGH	Pillow: OOB read in TiffDecode.c tile and RGBA paths leaks heap memory into pixels
CVE-2026-112896	8.8 HIGH	Pillow: TIFF encoder ColorMap plane-size mismatch causes a heap out-of-bounds read
CVE-2026-112397	8.7 HIGH	Pillow: Out-of-bounds access in _imagingmorph on a zero-width image
CVE-2026-112897	8.7 HIGH	Pillow: TiffDecode returns uninitialized memory as pixels for short JPEG strips
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-2026-112400	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-2026-112399	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-2026-112893	8.2 HIGH	Pillow: Invalid free in FreeType glyph rendering when a stroker is active
CVE-2026-112390	8.2 HIGH	Pillow: Infinite loop in MIC n_frames when the embedded TIFF
CVE-2026-112891	6.9 MEDIUM	Pillow: Quadratic GIF comment copying during save

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

IV. Related Vulnerabilities

Same product: Pillow

Same vendor: python-pillow

Same weakness: CWE-835

V. Comments for CVE-2026-112391

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

CVE-2026-112391— Pillow: PdfParser can recurse without limit in get_value() and linearize_page_tree()

Quick assessment

Possible ATT&CK Techniques 1 AI

I. Basic Information for CVE-2026-112391

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-112391

III. Intelligence Information for CVE-2026-112391

Other References for CVE-2026-112391 (3)

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

IV. Related Vulnerabilities

V. Comments for CVE-2026-112391

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