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CVE-2026-48840

29
FAUCET Score

Exim 4.88 before 4.99.4, in some proxy configurations, mishandles certain short payloads, leading to disclosure of uninitialized stack memory values to a client.

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

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.88, < 4.99.4CPE matchmatch criteria
cpe:2.3:a:exim:exim:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.26%
Probability of exploitation in next 30 days
EPSS Percentile
18.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0026 is in the 9th percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 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: 4.95-4ubuntu2.9
ubuntupatch availablevia ubuntu_usn
Product: exim4 (noble)Fixed in: 4.97-4ubuntu4.6
ubuntupatch availablevia ubuntu_usn
Product: exim4 (questing)Fixed in: 4.98.2-1ubuntu2.3
ubuntupatch availablevia ubuntu_usn
Product: exim4 (resolute)Fixed in: 4.99.1-1ubuntu1.3

Vendor Advisories (1)

ubuntuUSN-8353-1

Exim vulnerability

Jun 1, 2026

References

lists.debian.org / debian-lts-announce/2026/06/msg00004.html
openwall.com / lists/oss-security/2026/05/29/3
Mailing ListMitigationThird Party Advisory
exim.org / static/doc/security/EXIM-Security-2026-05-19.1
Vendor Advisory
openwall.com / lists/oss-security/2026/05/29/3
Mailing ListMitigationThird Party Advisory