CVE-2026-112396— Pillow: Heap use-after-free when encoding TIFF to an in-memory buffer
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 11.3.0 至 13.0.0 版本之间，当 libtiff 在将 TIFF 数据编码到内存缓冲区时拒绝某个标签（tag），Pillow 会触发堆释放后使用（heap use-after-free）漏洞。当应用程序将攻击者可控制的 TIFF 标签保存至 BytesIO 对象时，libtiff 可能在 函数的编码过程中拒绝该标签；随后的错误处理路径会释放输出缓冲区，却未关闭或清除 TIFF 句柄。之后，清理操作会通过写入回调函数向已被释放的内存写入数据，这可能导致进
Possible ATT&CK Techniques 2 AI
T1068 · Exploitation for Privilege Escalation T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-112396
Vulnerability Information
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Vulnerability Title
Pillow: Heap use-after-free when encoding TIFF to an in-memory buffer
Source: CVE Program / CVE List V5
Vulnerability Description
Pillow is a Python imaging library. From 11.3.0 until 13.0.0, Pillow has a heap use-after-free when libtiff rejects a tag while encoding TIFF data to an in-memory buffer. When an application saves attacker-influenced TIFF tags to BytesIO, libtiff can reject a tag during encoding in ImagingLibTiffEncode; the error path then frees the output buffer without closing or clearing the TIFF handle, and later cleanup flushes through the write callback into freed memory, which can crash the process and may enable code execution. This issue is fixed in version 13.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| python-pillow | Pillow | >= 11.3.0, < 13.0.0 | - |
|
II. Public POCs for CVE-2026-112396
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-112396 (1)
Vendor Advisories for CVE-2026-112396 (1)
Vendor Pages for CVE-2026-112396 (1)
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🔗 Release 13.0.0 · python-pillow/Pillow · GitHub x_refsource_MISC
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-2026-112398 | 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-2026-112400 | 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-2026-112892 | 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-2026-112894 | 8.7 HIGH | Pillow: Quadratic-time DoS in PDF save_all (PdfParser.next_object_id) |
| 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 |
Showing top 20 of 27 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Pillow
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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-416
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CVE-2026-112261
Gimp: gimp: use-after-free in xcf loader via prop_selected_p -
CVE-2026-112258
Gimp: gimp: use-after-free in xcf loader via prop_linked and -
CVE-2026-112402
Pillow: Double free in ImagingScaleAffine on calloc failure -
CVE-2026-110686
Cpanel::JSON::XS versions before 4.80 for Perl use freed fil -
CVE-2026-110681
Cpanel::JSON::XS versions before 4.80 for Perl use the paren
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