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CVE-2026-63501— ag-psd: Uncontrolled Memory Allocation in PSD Layer Decoding (totalMemoryLimit bypass)

Quick assessment

Affected
Agamnentzar ag-psd
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.

是一个用于读写 Photoshop 文档（PSD）文件的 JavaScript 库。在 31.0.3 版本之前， 函数接受 参数以解析不可信的 PSD 文件，但 函数期望的是名为 的属性，因此会向 传递一个未定义的（undefined）限制值。若攻击者能够向启用了图层解码功能的应用程序提供恶意构造的 PSD 文件，便可利用其控制的图层尺寸，触发超出配置限制的内存分配，从而导致进程内存耗尽并引发拒绝服务（DoS）攻击。 该安全公告还指出， 在解压 ZIP 编码的通道数据时未设置输出大小上限，同样可能因无限制的解压操作

CVSS 7.5 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
Agamnentzar ag-psd < 31.0.1 affected
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I. Basic Information for CVE-2026-63501

Vulnerability Information
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Vulnerability Title
ag-psd: Uncontrolled Memory Allocation in PSD Layer Decoding (totalMemoryLimit bypass)
Source: CVE Program / CVE List V5
Vulnerability Description
ag-psd is a JavaScript library for reading and writing Photoshop Document files. Prior to 31.0.3, readPsd() accepts a totalMemoryLimit for parsing untrusted PSD files, but decodeLayerImageData expects a differently named memoryLimit property and therefore passes an undefined limit to createImageDataBitDepth. An attacker who can supply a PSD to an application with layer decoding enabled can use attacker-controlled layer dimensions to trigger an allocation larger than the configured limit, causing process memory exhaustion and denial of service. The advisory also identifies inflateSync(compressed) decompressing ZIP-encoded channel data without an output-size cap, which can cause a similar denial of service through unbounded decompression. This vulnerability is fixed in 31.0.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Agamnentzar ag-psd < 31.0.1 -

II. Public POCs for CVE-2026-63501

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III. Intelligence Information for CVE-2026-63501

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Other References for CVE-2026-63501 (3)

IV. Related Vulnerabilities

Same product: ag-psd
Same vendor: Agamnentzar
Same weakness: CWE-770