CVE-2026-45185

CRITICAL EPSS 65.1%
Published May 12, 20261mo ago · Modified Jun 17, 20262w ago
9.8 CVSS 3.1
Critical
Find Similar
Published May 12, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
65.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 1

VendorProductVersionRange
eximexim*≥4.97  –  <4.99.3

References 8

  • openwall.com http://www.openwall.com/lists/oss-security/2026/05/12/25
    Mailing ListThird Party Advisory
  • code.exim.org https://code.exim.org/exim/wiki/wiki/EximSecurity
    Vendor Advisory
  • exim.org https://exim.org
    Product
  • exim.org https://exim.org/static/doc/security/CVE-2026-45185.txt
    Broken Link
  • exim.org https://exim.org/static/doc/security/EXIM-Security-2026-05-01.1/
    Release Notes
  • news.ycombinator.com https://news.ycombinator.com/item?id=48111748
    Issue Tracking
  • openwall.com https://www.openwall.com/lists/oss-security/2026/05/12/4
    Mailing ListThird Party Advisory
  • xbow.com https://xbow.com/blog/dead-letter-cve-2026-45185-xbow-found-rce-exim
    Third Party Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.