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CVE-2026-31961— Unbounded memory allocation in Quill via unvalidated size fields in Mach-O binary parsing

Quick assessment

Affected
anchore quill
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.

Quill是Quill开源的一个应用软件。提供应用编辑器功能。 Quill 0.7.1之前版本存在安全漏洞，该漏洞源于解析Mach-O二进制文件时无限制内存分配，可能导致内存耗尽和拒绝服务攻击。

CVSS 5.5 · Medium EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-31961

Vulnerability Information
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Vulnerability Title
Unbounded memory allocation in Quill via unvalidated size fields in Mach-O binary parsing
Source: CVE Program / CVE List V5
Vulnerability Description
Quill provides simple mac binary signing and notarization from any platform. Quill before version v0.7.1 contains an unbounded memory allocation vulnerability when parsing Mach-O binaries. Exploitation requires that Quill processes an attacker-supplied Mach-O binary, which is most likely in environments such as CI/CD pipelines, shared signing services, or any workflow where externally-submitted binaries are accepted for signing. When parsing a Mach-O binary, Quill reads several size and count fields from the LC_CODE_SIGNATURE load command and embedded code signing structures (SuperBlob, BlobIndex) and uses them to allocate memory buffers without validating that the values are reasonable or consistent with the actual file size. Affected fields include DataSize, DataOffset, and Size from the load command, Count from the SuperBlob header, and Length from individual blob headers. An attacker can craft a minimal (~4KB) malicious Mach-O binary with extremely large values in these fields, causing Quill to attempt to allocate excessive memory. This leads to memory exhaustion and denial of service, potentially crashing the host process. Both the Quill CLI and Go library are affected when used to parse untrusted Mach-O files. This vulnerability is fixed in 0.7.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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
Vulnerability Title
Quill 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Quill是Quill开源的一个应用软件。提供应用编辑器功能。 Quill 0.7.1之前版本存在安全漏洞，该漏洞源于解析Mach-O二进制文件时无限制内存分配，可能导致内存耗尽和拒绝服务攻击。
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
anchore quill < 0.7.1 -

II. Public POCs for CVE-2026-31961

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III. Intelligence Information for CVE-2026-31961

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Vendor Advisories for CVE-2026-31961 (1)

Same Patch Batch · anchore · 2026-03-11 · 3 CVEs total

CVE-2026-31959 5.3 MEDIUM SSRF in Quill via unvalidated URL from Apple notarization log retrieval
CVE-2026-31960 5.3 MEDIUM DoS in Quill via unbounded read of HTTP response body during notarization

IV. Related Vulnerabilities

Same product: quill
Same vendor: anchore
Same weakness: CWE-770

V. Comments for CVE-2026-31961

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