CVE-2026-42309— Pillow: Heap buffer overflow with nested list coordinates
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| python-pillow | Pillow | >= 11.2.1, < 12.2.0 | affected |
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I. Basic Information for CVE-2026-42309
Vulnerability Information
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Vulnerability Title
Pillow: Heap buffer overflow with nested list coordinates
Source: CVE Program / CVE List V5
Vulnerability Description
Pillow is a Python imaging library. From version 11.2.1 to before version 12.2.0, passing nested lists as coordinates to APIs that accept coordinates such as ImagePath.Path, ImageDraw.ImageDraw.polygon and ImageDraw.ImageDraw.line could cause a heap buffer overflow, as nested lists were recursively unpacked beyond the allocated buffer. Coordinate lists are now validated to contain exactly two numeric coordinates. This issue has been patched in version 12.2.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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
Vulnerability Title
Pillow 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Pillow是Pillow开源的一款基于Python的图像处理库。 Pillow 11.2.1版本至12.2.0之前版本存在安全漏洞，该漏洞源于将嵌套列表作为坐标传递给API时可能导致堆缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| python-pillow | Pillow | >= 11.2.1, < 12.2.0 | - |
II. Public POCs for CVE-2026-42309
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-42309 (1)
- 🔗 Release 12.2.0 · python-pillow/Pillow · GitHubx_refsource_MISC
Vendor Advisories for CVE-2026-42309 (1)
Same Patch Batch · python-pillow · 2026-05-09 · 4 CVEs total
| CVE-2026-42308 | Pillow: Integer overflow when processing fonts | |
| CVE-2026-42311 | Pillow: OOB Write with Invalid PSD Tile Extents (Integer Overflow) | |
| CVE-2026-42310 | Pillow: PDF Parsing Trailer Infinite Loop (DoS) |
IV. Related Vulnerabilities
Same product: Pillow
- CVE-2026-54058
Pillow: Out-of-bounds read via attacker-controlled row strid - CVE-2026-59197
Pillow: Heap out-of-bounds write in Pillow `ImageFilter.Rank - CVE-2026-59200
Pillow: Decompression Bomb DoS via PdfParser.PdfStream.decod - CVE-2026-59198
Pillow TGA RLE encoder can serialize up to ~57 KB of adjacen - CVE-2026-59205
Pillow: Controlled heap out-of-bounds write in `ImageCmsTran
Same vendor: python-pillow
- CVE-2026-54058
Pillow: Out-of-bounds read via attacker-controlled row strid - CVE-2026-59197
Pillow: Heap out-of-bounds write in Pillow `ImageFilter.Rank - CVE-2026-59200
Pillow: Decompression Bomb DoS via PdfParser.PdfStream.decod - CVE-2026-59198
Pillow TGA RLE encoder can serialize up to ~57 KB of adjacen - CVE-2026-59205
Pillow: Controlled heap out-of-bounds write in `ImageCmsTran
Same weakness: CWE-122
- CVE-2026-13072
MongoDB Improper Input Validation in Compute Mode External D - CVE-2026-64830
FFmpeg 2.1 - 8.1.2 Heap Buffer Overflow via VobSub Subtitle - CVE-2026-40691
Packet of death for DNSCrypt over TCP - CVE-2026-8987
Authenticated Heap Overflow - CVE-2026-44178
xrdp: Channel Data Forwarding Fixed-Size Buffer Overflow
V. Comments for CVE-2026-42309
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