CVE-2026-45185_CVE-2026-45185

9.8 / 10

CRITICAL

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

Description

Exim before 4.99.3, in certain GnuTLS configurations, has a remotely reachable use-after-free in the BDAT body parsing path. It is triggered when a client sends a TLS close_notify mid-body during a CHUNKING transfer, followed by a final cleartext byte on the same TCP connection. This can lead to heap corruption. An unauthenticated network attacker exploiting this vulnerability could execute arbitrary code.

Basic Information

ID CVE-2026-45185

Source mitre

Published May 12, 2026 at 00:00

Modified May 12, 2026 at 20:08

Affected Product

Vendor Exim

Product Exim

Version 4.97

Affected Versions Exim Exim 4.97

CWE Classification

CWE-416

References

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    "lastseen": "",
    "description": "Exim before 4.99.3, in certain GnuTLS configurations, has a remotely reachable use-after-free in the BDAT body parsing path. It is triggered when a client sends a TLS close_notify mid-body during a CHUNKING transfer, followed by a final cleartext byte on the same TCP connection. This can lead to heap corruption. An unauthenticated network attacker exploiting this vulnerability could execute arbitrary code.",
    "published": "2026-05-12T00:00:00.000Z",
    "modified": "2026-05-12T20:08:08.207Z",
    "type": "cve",
    "title": "CVE-2026-45185",
    "source": "mitre",
    "references": "https://exim.org\nhttps://code.exim.org/exim/wiki/wiki/EximSecurity\nhttps://exim.org/static/doc/security/CVE-2026-45185.txt\nhttps://xbow.com/blog/dead-letter-cve-2026-45185-xbow-found-rce-exim\nhttps://news.ycombinator.com/item?id=48111748\nhttps://www.openwall.com/lists/oss-security/2026/05/12/4\nhttps://exim.org/static/doc/security/EXIM-Security-2026-05-01.1/",
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    "sourceData": "Exim Exim 4.97",
    "sourceHref": "",
    "cvss": {
        "score": 9.8,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
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        "cvssV3": {
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