DEBIAN-CVE-2026-50722

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Source
https://security-tracker.debian.org/tracker/CVE-2026-50722
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-50722.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-50722
Upstream
  • CVE-2026-50722
Published
2026-07-02T22:16:43.550Z
Modified
2026-07-03T12:00:07.932260950Z
Severity
  • 8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

Libreswan, via the function RSAauthenticatehashsignaturepkcs115rsa(), did not correctly verify the DER encoding of the ASN.1 digest when the IKEv2 AUTH payload was encoded using RSASSA-PKCS1-v15 (RFC 8017). A remote attacker can use a variation on the Bleichenbacher attack to forge the AUTH payload when small public exponents are used (e.g., e=3), leading to impersonation. Additionally, a remote attacker, by encoding a shorter than expected hash in the AUTH payload, could trigger an assertion leading to denial-of-service. The daemon aborts and restarts; continued exploitation causes sustained denial of service. Remote code execution is not possible. X.509 certificate verifications of the remote IKE peer are not affected.

References

Affected packages

Debian:11 / libreswan

Package

Name
libreswan
Purl
pkg:deb/debian/libreswan?arch=source&distro=bullseye

Affected ranges

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

Affected versions

4.*
4.3-1
4.3-1+deb11u1
4.3-1+deb11u3
4.3-1+deb11u4
4.5-1
4.5-2
4.6-1
4.7-1
4.9-1
4.9-2
4.10-1
4.10-2
4.11-1
4.12-1
4.12-2
4.12-3
4.14-1
4.14-1.1
4.15-1
5.*
5.0~rc2-1
5.0~rc2-2
5.2-1
5.2-2
5.2-2.1
5.2-2.2
5.2-2.3
5.2-2.4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-50722.json"

Debian:12 / libreswan

Package

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

Affected ranges

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

Affected versions

4.*
4.10-2
4.10-2+deb12u1
4.11-1
4.12-1
4.12-2
4.12-3
4.14-1
4.14-1.1
4.15-1
5.*
5.0~rc2-1
5.0~rc2-2
5.2-1
5.2-2
5.2-2.1
5.2-2.2
5.2-2.3
5.2-2.4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-50722.json"

Debian:13 / libreswan

Package

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

Affected ranges

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

Affected versions

5.*
5.2-2.2
5.2-2.3
5.2-2.4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-50722.json"

Debian:14 / libreswan

Package

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

Affected ranges

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

Affected versions

5.*
5.2-2.2
5.2-2.3
5.2-2.4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-50722.json"