DEBIAN-CVE-2026-54431
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
DEBIAN-CVE-2026-54431
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-54431
liboauth2
Source reference: /affected/0/package/name
- Affected versions
- 1.4.5.4-1
Source reference:
/affected/0/versions1.5.1-1Source reference:
/affected/0/versions1.5.1-2Source reference:
/affected/0/versions1.5.1-3Source reference:
/affected/0/versions1.5.2-1Source reference:
/affected/0/versions1.6.0-1Source reference:
/affected/0/versions1.6.1-1Source reference:
/affected/0/versions1.6.2-1Source reference:
/affected/0/versions1.6.3-1Source reference:
/affected/0/versions2.0.0-1Source reference:
/affected/0/versions2.1.0-1Source reference:
/affected/0/versions2.1.0-2Source reference:
/affected/0/versions2.1.1-1Source reference:
/affected/0/versions2.2.0-1Source reference:
/affected/0/versions2.2.0-2Source reference:
/affected/0/versions2.2.1-1Source reference:
/affected/0/versions2.3.0-1Source reference:
/affected/0/versions2.4.0-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
liboauth2
Source reference: /affected/1/package/name
- Affected versions
- 2.1.0-2
Source reference:
/affected/1/versions2.1.1-1Source reference:
/affected/1/versions2.2.0-1Source reference:
/affected/1/versions2.2.0-2Source reference:
/affected/1/versions2.2.1-1Source reference:
/affected/1/versions2.3.0-1Source reference:
/affected/1/versions2.4.0-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
liboauth2
Source reference: /affected/2/package/name
- Affected versions
- 2.1.0-2
Source reference:
/affected/2/versions2.1.1-1Source reference:
/affected/2/versions2.2.0-1Source reference:
/affected/2/versions2.2.0-2Source reference:
/affected/2/versions2.2.1-1Source reference:
/affected/2/versions - Fixed versions
- 2.3.0-1
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "liboauth2",
"purl": "pkg:deb/debian/liboauth2?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"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",
"2.0.0-1",
"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",
"2.4.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54431.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "liboauth2",
"purl": "pkg:deb/debian/liboauth2?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2.1.0-2",
"2.1.1-1",
"2.2.0-1",
"2.2.0-2",
"2.2.1-1",
"2.3.0-1",
"2.4.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54431.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.3.0-1"
}
]
}
],
"package": {
"name": "liboauth2",
"purl": "pkg:deb/debian/liboauth2?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2.1.0-2",
"2.1.1-1",
"2.2.0-1",
"2.2.0-2",
"2.2.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54431.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #57890 · Revision 1
- Added to Heist Feed
- Publisher date