High
libnet-oauth-perl — security advisory
Net::OAuth versions before 0.33 for Perl check HMAC-SHA1, HMAC-SHA256 and PLAINTEXT signatures with a non-constant-time comparison in verify. Each of the three compares the signature carried in the message against the locally computed one with the eq operator, which returns as soon as the two strings differ. The time taken to reject a signature varies with the length of the matching prefix. RSA-SHA1 is not affected, as it verifies through the RSA key object rather than by comparing strings. A client that can submit messages and time the replies may recover a valid signature one byte at a time rather than searching the whole signature space. Under PLAINTEXT the value compared against is the signature key itself, so the search recovers consumer_secret and token_secret.
- Products
- libnet-oauth-perl
- Affected versions
- 0.28-2, 0.28-3, 0.28-4, 0.31-1, 0.33-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-75589
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:16 UTC · Revision 1
Source evidence
Net::OAuth versions before 0.33 for Perl check HMAC-SHA1, HMAC-SHA256 and PLAINTEXT signatures with a non-constant-time comparison in verify. Each of the three compares the signature carried in the message against the locally computed one with the eq operator, which returns as soon as the two strings differ. The time taken to reject a signature varies with the length of the matching prefix. RSA-SHA1 is not affected, as it verifies through the RSA key object rather than by comparing strings. A client that can submit messages and time the replies may recover a valid signature one byte at a time rather than searching the whole signature space. Under PLAINTEXT the value compared against is the signature key itself, so the search recovers consumer_secret and token_secret.
osv:UBUNTU-CVE-2026-75589
libnet-oauth-perl
Fixed versions: Not specified
libnet-oauth-perl
Fixed versions: Not specified
libnet-oauth-perl
Fixed versions: Not specified
libnet-oauth-perl
Fixed versions: Not specified
libnet-oauth-perl
Fixed versions: Not specified
libnet-oauth-perl
Fixed versions: Not specified
libnet-oauth-perl
Fixed versions: Not specified
Complete source record
{
"id": "67e42456eb6109203de132ddcd1e592faf4594e58ed6e84a3d553f9ac6fd644a",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-75589",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-75589",
"summary": "Net::OAuth versions before 0.33 for Perl check HMAC-SHA1, HMAC-SHA256 and PLAINTEXT signatures with a non-constant-time comparison in verify. Each of the three compares the signature carried in the message against the locally computed one with the eq operator, which returns as soon as the two strings differ. The time taken to reject a signature varies with the length of the matching prefix. RSA-SHA1 is not affected, as it verifies through the RSA key object rather than by comparing strings. A client that can submit messages and time the replies may recover a valid signature one byte at a time rather than searching the whole signature space. Under PLAINTEXT the value compared against is the signature key itself, so the search recovers consumer_secret and token_secret.",
"evidence": "osv:UBUNTU-CVE-2026-75589",
"products": [
{
"name": {
"value": "libnet-oauth-perl",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.28-2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
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},
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{
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{
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{
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"affected_versions": [
{
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"evidence": "/affected/3/versions"
}
]
},
{
"name": {
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"evidence": "/affected/4/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "0.28-4",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
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"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.31-1",
"evidence": "/affected/5/versions"
},
{
"value": "0.33-1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "libnet-oauth-perl",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.31-1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-75589",
"aliases": [
"UBUNTU-CVE-2026-75589"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "libnet-oauth-perl",
"purl": "pkg:deb/ubuntu/libnet-oauth-perl?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"0.28-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75589.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-oauth-perl",
"binary_version": "0.28-2"
}
]
}
},
{
"ranges": [
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],
"package": {
"name": "libnet-oauth-perl",
"purl": "pkg:deb/ubuntu/libnet-oauth-perl?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"0.28-2"
],
"database_specific": {
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},
"ecosystem_specific": {
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{
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"package": {
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"purl": "pkg:deb/ubuntu/libnet-oauth-perl?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
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],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75589.json"
},
"ecosystem_specific": {
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},
{
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],
"package": {
"name": "libnet-oauth-perl",
"purl": "pkg:deb/ubuntu/libnet-oauth-perl?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"0.28-3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75589.json"
},
"ecosystem_specific": {
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]
}
},
{
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"package": {
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"purl": "pkg:deb/ubuntu/libnet-oauth-perl?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"0.28-4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75589.json"
},
"ecosystem_specific": {
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{
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"package": {
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"purl": "pkg:deb/ubuntu/libnet-oauth-perl?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"0.31-1",
"0.33-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75589.json"
},
"ecosystem_specific": {
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{
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"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"0.31-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-75589.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-oauth-perl",
"binary_version": "0.31-1"
}
]
}
}
],
"modified": "2026-10-17T13:01:05.370962453Z",
"provider": "osv",
"upstream": [
"CVE-2026-75589"
],
"references": [
"https://ubuntu.com/security/CVE-2026-75589",
"https://www.cve.org/CVERecord?id=CVE-2026-75589",
"https://lists.security.metacpan.org/cve-announce/msg/42818763/",
"https://github.com/vurtdev/Net-OAuth/security/advisories/GHSA-g8xr-69p3-gw56",
"https://github.com/vurtdev/Net-OAuth/commit/a1a16b58add85668ef4fcda642a486ceed098eba.patch",
"https://metacpan.org/release/RRWO/Net-OAuth-0.33/changes"
]
},
"related_cves": [
{
"value": "CVE-2026-75589",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360951,
"published_at": "2026-08-19T08:17:00+00:00"
}