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CVE-2026-61908

Cyrus IMAP · Vulnerability

CVSS 3.1 3.1 LOWCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-61908

Published

An issue was discovered in Cyrus IMAP before 3.12.4. A JMAP email-header blob ID can reference an out-of-bounds index. An authenticated user could attempt to download a crafted JMAP blob ID of the form H<emailid>-<index>, which could read past the end of the internal blob_headers array during download, exposing adjacent heap memory.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-61908

Published

Cyrus IMAP

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "product": "Cyrus IMAP",
                    "vendor": "cyrusimap",
                    "versions": [
                        {
                            "lessThan": "3.8.8",
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver"
                        },
                        {
                            "lessThan": "3.10.4",
                            "status": "affected",
                            "version": "3.9.0",
                            "versionType": "semver"
                        },
                        {
                            "lessThan": "3.12.4",
                            "status": "affected",
                            "version": "3.11.0",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON