CVE-2026-112898— Pillow: Image.quantize() with empty palette leaks uninitialized stack memory
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 9.1.0 到 13.0.0 版本之间，当 方法使用空调色板时，Pillow 可能会泄露未初始化的栈内存。具体而言， 函数在调色板条目数为零时，会留下一个未初始化的本地缓存数组；而后续的转换路径会将这些字节作为输出像素索引直接输出。如果攻击者能够控制调色板图像，即可通过返回的 PNG 或 GIF 文件获取栈内存内容。该漏洞可在不触发越界访问、内存破坏或进程崩溃的情况下，泄露内存地址及栈保护（stack canary）数据。此问题已在 13.0.0 版本中修复。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-112898
Vulnerability Information
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Vulnerability Title
Pillow: Image.quantize() with empty palette leaks uninitialized stack memory
Source: CVE Program / CVE List V5
Vulnerability Description
Pillow is a Python imaging library. From 9.1.0 until 13.0.0, Pillow can disclose uninitialized stack memory when Image.quantize() uses an empty palette. ImagingPaletteCacheUpdate() leaves a local cache array uninitialized when the palette has zero entries, and the conversion path emits those bytes as output pixel indices. An attacker who controls the palette image can obtain stack contents from a returned PNG or GIF. This can disclose addresses and stack-canary data without an out-of-bounds access, memory corruption, or process crash. 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:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用未经初始化的变量
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| python-pillow | Pillow | >= 9.1.0, < 13.0.0 | - |
|
II. Public POCs for CVE-2026-112898
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-112898 (3)
-
https://github.com/python-pillow/Pillow/releases/tag/13.0.0 x_refsource_MISC
-
https://github.com/python-pillow/Pillow/security/advisories/GHSA-rfgq-q3w2-pmv2 x_refsource_CONFIRM
Same Patch Batch · python-pillow · 2026-10-19 · 27 CVEs total
| CVE-2026-112403 | 9.2 CRITICAL | Pillow: Heap buffer overflow in ImagingJpegDecode |
| 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-2026-112397 | 8.7 HIGH | Pillow: Out-of-bounds access in _imagingmorph on a zero-width image |
| 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-2026-112897 | 8.7 HIGH | Pillow: TiffDecode returns uninitialized memory as pixels for short JPEG strips |
| 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-2026-112892 | 8.7 HIGH | Pillow: MSP RLE decoder expands a tiny file into unbounded memory |
| CVE-2026-112405 | 8.7 HIGH | Pillow: NULL pointer dereference in Image.merge via an unvalidated band 0 |
| CVE-2026-112895 | 8.7 HIGH | Pillow: Unbounded recursion parsing a PDF page tree or trailer chain (incomplete fix for C |
| 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-2026-112901 | 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
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CVE-2026-112900
Pillow: Argument Injection in Ghostscript call, potentially -
CVE-2026-112897
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CVE-2026-112896
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CVE-2026-112896
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CVE-2026-112895
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Same weakness: CWE-457
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