CVE-2026-40687_CVE-2026-40687

4.8 / 10

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

Description

In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can be an out-of-bounds write that crashes the connection instance, or erroneous data processing that divulges data from uninitialized heap memory.

Basic Information

ID CVE-2026-40687

Source mitre

Published Apr 30, 2026 at 00:00

Modified Apr 30, 2026 at 21:32

Affected Product

Vendor Exim

Product Exim

Affected Versions Exim Exim 0

CWE Classification

CWE-909

References

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    "lastseen": "",
    "description": "In Exim before 4.99.2, when the SPA authentication driver is used with an adversarial SPA resource, there can be an out-of-bounds write that crashes the connection instance, or erroneous data processing that divulges data from uninitialized heap memory.",
    "published": "2026-04-30T00:00:00.000Z",
    "modified": "2026-04-30T21:32:54.175Z",
    "type": "cve",
    "title": "CVE-2026-40687",
    "source": "mitre",
    "references": "https://exim.org/static/doc/security/CVE-2025-40687.txt\nhttps://www.openwall.com/lists/oss-security/2026/04/30/21\nhttps://exim.org/static/doc/security/cve-2026-04.1/CVE2026-40687.assessment\nhttps://code.exim.org/exim/exim/commit/68b963b9f75ca27b38e1c0f8c87037990199f505",
    "id": "CVE-2026-40687",
    "bulletinFamily": "",
    "cwe": [
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    "cvelist": null,
    "sourceData": "Exim Exim 0",
    "sourceHref": "",
    "cvss": {
        "score": 4.8,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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            "baseScore": 0,
            "baseSeverity": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Exim",
    "version": "0",
    "vendor": "Exim",
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}