CVE-2026-115774

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Source
https://cve.org/CVERecord?id=CVE-2026-115774
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-115774.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-115774
Aliases
Downstream
Published
2026-10-23T20:14:07Z
Modified
2026-10-25T02:45:47Z
Severity
  • 4.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Twisted: Denial of Service in the Twisted IMAP4 Server via a Negative Literal Size in SEARCH
Details

Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, twisted.mail.imap4.IMAP4Server reaches twisted.mail.imap4.parseNestedParens with a negative literal size in an authenticated SEARCH command after the client enters the selected mailbox state. The negative size moves the parser cursor below zero, and Python's negative indexing prevents the synchronous scanning loop from terminating. The loop freezes the single-threaded reactor, stopping other IMAP connections and any SMTP or POP3 services hosted in the same process until restart. This issue is fixed in version 26.10.0rc1.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-400",
        "CWE-835"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115774.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "fixed":  "26.10.0rc1"
                        }
                    ],
                    "source":  "AFFECTED_FIELD",
                    "strategy":  "StringRangeExpression"
                }
            ]
        },
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "introduced":  "3.6+"
                        },
                        {
                            "fixed":  "26.10.0rc1"
                        },
                        {
                            "fixed":  "26.10.0rc1"
                        }
                    ],
                    "source":  "DESCRIPTION"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/twisted/twisted

Affected ranges

Type
GIT
Repo
https://github.com/twisted/twisted
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
3d125548bcbe955007cb97f480bb699a5e074741
Fixed
875d118c9a82a4f55a92ff399bd31f8928a52ad3
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "fixed":  "3d125548bcbe955007cb97f480bb699a5e074741"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "twisted-26.10.0rc1",
            "range":  [
                {
                    "fixed":  "875d118c9a82a4f55a92ff399bd31f8928a52ad3"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

Other
before-black

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-115774.json"