DEBIAN-CVE-2026-70368

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Source
https://security-tracker.debian.org/tracker/CVE-2026-70368
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-70368.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-70368
Upstream
Published
2026-08-04T14:16:32Z
Modified
2026-10-05T01:00:08Z
Severity
  • 6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L CVSS Calculator
Summary
[none]
Details

A stack-based out-of-bounds read vulnerability exists in the "s_vlog" function of stunnel, when handling oversized log messages via "vsnprintf". A remote attacker with network access to a stunnel service can send protocol inputs that trigger a log message longer than 1024 bytes, leading to an out-of-bounds stack read and a potential crash. In certain corner cases, the same vulnerability could be used to replace a series of trailing "\n" characters with "\0".

References

Affected packages

Debian:14 / stunnel

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3:5.80-1

Affected versions

3.*
3.10-0potato1
3.22-1
2:3.*
2:3.26-2
2:3.26-2.1
2:3.26-3
2:3.26-4
2:3.26-5
2:3.26-6
2:3.26-7
2:3.26-8
2:3.26-9
2:3.26-10
2:3.26-11
2:3.26-dfsg-1
2:3.26-dfsg-2
3:5.*
3:5.78-3
3:5.78-4
3:5.78-5
3:5.79-1
3:5.79-2

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-70368.json"

Debian:12 / stunnel4

Package

Name
stunnel4
Purl
pkg:deb/debian/stunnel4?arch=source&distro=bookworm

Affected ranges

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

Affected versions

3:5.*
3:5.68-2
3:5.68-2+deb12u1
3:5.70-1
3:5.70-2
3:5.72-1
3:5.72-2
3:5.72-3
3:5.72-4
3:5.73-1
3:5.74-1
3:5.74-2
3:5.76-1
3:5.77-1
3:5.78-1
3:5.78-2

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-70368.json"

Debian:13 / stunnel4

Package

Name
stunnel4
Purl
pkg:deb/debian/stunnel4?arch=source&distro=trixie

Affected ranges

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

Affected versions

3:5.*
3:5.74-2
3:5.76-1
3:5.77-1
3:5.78-1
3:5.78-2

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-70368.json"