DEBIAN-CVE-2026-54431

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Source
https://security-tracker.debian.org/tracker/CVE-2026-54431
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54431.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-54431
Upstream
Published
2026-07-02T11:16:17Z
Modified
2026-09-14T17:03:20Z
Severity
  • 5.1 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/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

In liboauth2 the Demonstrating Proof-of-Possession (DPoP) verifier accepts a proof whose JSON Web Key (jwk) header contains private key material. RFC 9449 section 4.3 step 7 requires the verifier to reject such a proof but oauth2_token_verify() function returns success for a malformed DPoP proof that embeds the private Elliptic Curve (EC) key in the header. This issue was fixed in version 2.3.0

References

Affected packages

Debian:12 / liboauth2

Package

Name
liboauth2
Purl
pkg:deb/debian/liboauth2?arch=source&distro=bookworm

Affected ranges

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

Affected versions

1.*
1.4.5.4-1
1.5.1-1
1.5.1-2
1.5.1-3
1.5.2-1
1.6.0-1
1.6.1-1
1.6.2-1
1.6.3-1
2.*
2.0.0-1
2.1.0-1
2.1.0-2
2.1.1-1
2.2.0-1
2.2.0-2
2.2.1-1
2.3.0-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54431.json"

Debian:13 / liboauth2

Package

Name
liboauth2
Purl
pkg:deb/debian/liboauth2?arch=source&distro=trixie

Affected ranges

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

Affected versions

2.*
2.1.0-2
2.1.1-1
2.2.0-1
2.2.0-2
2.2.1-1
2.3.0-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54431.json"

Debian:14 / liboauth2

Package

Name
liboauth2
Purl
pkg:deb/debian/liboauth2?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.3.0-1

Affected versions

2.*
2.1.0-2
2.1.1-1
2.2.0-1
2.2.0-2
2.2.1-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54431.json"