DEBIAN-CVE-2026-40684

See a problem?
Please try reporting it to the source first.
Source
https://security-tracker.debian.org/tracker/CVE-2026-40684
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40684.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-40684
Upstream
  • CVE-2026-40684
Published
2026-04-30T22:16:25Z
Modified
2026-09-14T17:03:33Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

In Exim before 4.99.2, on systems using musl libc (not glibc), an attacker can crash the connection instance when malformed DNS data is present in PTR records. This is caused by a dn_expand oddity in octal printing.

References

Affected packages

Debian:12 / exim4

Package

Name
exim4
Purl
pkg:deb/debian/exim4?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.96-15+deb12u9

Affected versions

4.*
4.96-15
4.96-15+deb12u1
4.96-15+deb12u2
4.96-15+deb12u3
4.96-15+deb12u4
4.96-15+deb12u5
4.96-15+deb12u6
4.96-15+deb12u7
4.96-15+deb12u8

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40684.json"

Debian:13 / exim4

Package

Name
exim4
Purl
pkg:deb/debian/exim4?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.98.2-1+deb13u2

Affected versions

4.*
4.98.2-1
4.98.2-1+deb13u1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40684.json"

Debian:14 / exim4

Package

Name
exim4
Purl
pkg:deb/debian/exim4?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.99.2-1

Affected versions

4.*
4.98.2-1
4.98.2-1+hurd.1
4.98.2-2
4.99~RC1-1
4.99~RC2-1
4.99~RC3-1
4.99~RC3-2
4.99-1
4.99-2
4.99-3
4.99-4~bpo13+1
4.99-4
4.99-5
4.99-6~bpo13+1
4.99-6
4.99-7~bpo13+1
4.99-7
4.99.1-1~bpo13+1
4.99.1-1
4.99.1-2
4.99.1-3
4.99.1-4
4.99.1-5
4.99.1-6
4.99.2-1~bpo13+1

Ecosystem specific 

{
    "urgency": "unimportant"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-40684.json"