Unbounded Memory Allocation Vulnerability in Quill by Anchore
CVE-2026-31961

5.5MEDIUM

Key Information:

Vendor

Anchore

Status
Quill
Vendor
CVE Published:
11 March 2026

What is CVE-2026-31961?

Quill, a tool developed by Anchore for macOS binary signing and notarization, contains an unbounded memory allocation vulnerability affecting versions prior to v0.7.1. This vulnerability arises when the tool processes attacker-controlled Mach-O binaries. Exploiting this vulnerability can result in memory exhaustion, leading to denial of service. The issue stems from the way Quill parses size and count fields from the LC_CODE_SIGNATURE load command and other embedded structures without proper validation, allowing an attacker to craft a malicious binary with absurdly large field values. As a result, excessive memory allocation can occur, potentially crashing the host process during the parsing of untrusted Mach-O files. The vulnerability has been addressed in version 0.7.1.

Affected Version(s)

quill < 0.7.1

References

https://github.com/anchore/quill/security/advisories/GHSA...
x_refsource_CONFIRM

CVSS V3.1

Score:
5.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.