DEBIAN-CVE-2026-67194

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Source
https://security-tracker.debian.org/tracker/CVE-2026-67194
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-67194.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-67194
Upstream
Published
2026-07-29T17:16:54Z
Modified
2026-09-14T17:03:29Z
Severity
  • 7.1 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator
Summary
[none]
Details

Courier IMAP before 6.0.1 and Courier Mail Server before 2.0.2 allow authenticated IMAP users to crash the imapd process via deeply nested parenthesized SEARCH queries. The SEARCH command parser (alloc_search_key in searchinfo.C) recursively descends on nested parenthesized groups through a mutual recursion chain with alloc_search_andlist() and alloc_search_notkey(), with no depth limit. Courier IMAP has no overall command line length limit, making exploitation trivial. A single IMAP command with ~2500 nested parentheses overflows the 8MB default stack, causing SIGSEGV.

References

Affected packages

Debian:12 / courier

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.0.16-3
1.0.16-3.1
1.0.16-3.2
1.3.13-1
1.3.13-2
1.3.13-3
1.3.13-4
1.3.13-5
1.3.13-6
1.3.13-7
1.3.13-8
1.3.13-9
1.3.13-10
1.3.13-11
1.4.1-1
1.4.1-2
1.4.1-3
1.4.1-4
1.4.1-5
1.4.1-6
1.4.1-7
1.4.1-8
1.4.1-9
1.4.1-10
1.5.1-1
1.5.1-2
1.5.1-3
1.5.1-4
2.*
2.0.2-1
2.0.2-2
2.0.2-3
2.0.2-4
2.0.3-1
2.0.3-2
2.0.6-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-67194.json"

Debian:13 / courier

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.4.1-3
1.4.1-3+deb13u1
1.4.1-3+deb13u2
1.4.1-4
1.4.1-5
1.4.1-6
1.4.1-7
1.4.1-8
1.4.1-9
1.4.1-10
1.5.1-1
1.5.1-2
1.5.1-3
1.5.1-4
2.*
2.0.2-1
2.0.2-2
2.0.2-3
2.0.2-4
2.0.3-1
2.0.3-2
2.0.6-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-67194.json"

Debian:14 / courier

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.0.3-1

Affected versions

1.*
1.4.1-3
1.4.1-4
1.4.1-5
1.4.1-6
1.4.1-7
1.4.1-8
1.4.1-9
1.4.1-10
1.5.1-1
1.5.1-2
1.5.1-3
1.5.1-4
2.*
2.0.2-1
2.0.2-2
2.0.2-3
2.0.2-4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-67194.json"