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CVE-2026-40687

35
FAUCET Score

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.

First published: Apr 30, 2026Last modified: May 1, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 0, < 4.99.2CPE match
cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*
< 4.99.2CPE matchmatch criteria
cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.8MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
2.2
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.37%
Probability of exploitation in next 30 days
EPSS Percentile
29.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0037 is in the 7th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

ubuntupatch availablevia ubuntu_usn
Product: exim4 (jammy)Fixed in: 4.95-4ubuntu2.7
ubuntupatch availablevia ubuntu_usn
Product: exim4 (noble)Fixed in: 4.97-4ubuntu4.4
ubuntupatch availablevia ubuntu_usn
Product: exim4 (questing)Fixed in: 4.98.2-1ubuntu2.1
ubuntupatch availablevia ubuntu_usn
Product: exim4 (resolute)Fixed in: 4.99.1-1ubuntu1.1

Vendor Advisories (1)

ubuntuUSN-8228-1

Exim vulnerabilities

May 4, 2026

References

code.exim.org / exim/exim/commit/68b963b9f75ca27b38e1c0f8c87037990199f505
Patch
exim.org / static/doc/security/cve-2026-04.1/CVE2026-40687.assessment
Vendor Advisory
exim.org / static/doc/security/CVE-2026-40687.txt
Broken Link
openwall.com / lists/oss-security/2026/04/30/21
Mailing ListThird Party Advisory