CVE-2026-112393— Pillow: Heap buffer overflow in _tiffWriteProc when saving TIFF to BytesIO
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。从 2.0.0 版本到 13.0.0 版本，Pillow 在通过 libtiff 将压缩的 TIFF 数据保存到不支持可用 的目标（例如 ）时，其 函数存在堆缓冲区溢出和旧堆数据泄露漏洞。该回调函数根据先前的缓冲区大小而非当前写入位置来确定分配大小，导致攻击者可控制的非行内 TIFF 标签或保留的 ICC 配置文件在 libtiff 向前 seek 后，被复制到超出分配区域的内存中。此溢出可能导致进程崩溃，并可能允许攻击者执行任意代码。此外，独立地，在压缩 TIFF
Possible ATT&CK Techniques 2 AI
T1068 · Exploitation for Privilege Escalation T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-112393
Vulnerability Information
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Vulnerability Title
Pillow: Heap buffer overflow in _tiffWriteProc when saving TIFF to BytesIO
Source: CVE Program / CVE List V5
Vulnerability Description
Pillow is a Python imaging library. From 2.0.0 until 13.0.0, Pillow has a heap buffer overflow and stale-heap disclosure in _tiffWriteProc when saving compressed TIFF data through libtiff to a target without a usable fileno(), such as BytesIO. The callback sizes its allocation from the prior buffer size instead of the current write position, allowing an attacker-controlled out-of-line TIFF tag or retained ICC profile to be copied beyond the allocation after libtiff seeks forward. This overflow can crash the process and may allow code execution. Independently, unwritten alignment gaps in compressed TIFF output larger than 64 KiB can disclose stale heap bytes without a crafted tag. File paths and targets with real file descriptors are unaffected. 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:P/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 | >= 2.0.0, < 13.0.0 | - |
|
II. Public POCs for CVE-2026-112393
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-112393 (3)
-
https://github.com/python-pillow/Pillow/releases/tag/13.0.0 x_refsource_MISC
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https://github.com/python-pillow/Pillow/security/advisories/GHSA-332p-7hrc-92wf 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-2026-112398 | 9.2 CRITICAL | Pillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution |
| CVE-2026-112900 | 9.2 CRITICAL | Pillow: Argument Injection in Ghostscript call, potentially leading into RCE |
| 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-2026-112399 | 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-2026-112897 | 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-2026-112894 | 8.7 HIGH | Pillow: Quadratic-time DoS in PDF save_all (PdfParser.next_object_id) |
| CVE-2026-112406 | 8.7 HIGH | Pillow: Infinite loop in PdfParser.rewrite_pages on page tree Parent cycle |
| 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-2026-112392 | 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 → →
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-2026-112393
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