ubuntu-cve-2026-75589
Vulnerability from osv_ubuntu
Published
2026-08-20 00:00
Modified
2026-08-20 00:00
Summary
Details
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.
Severity
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-oauth-perl",
"binary_version": "0.28-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "libnet-oauth-perl",
"purl": "pkg:deb/ubuntu/libnet-oauth-perl@0.28-2?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.28-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-oauth-perl",
"binary_version": "0.28-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "libnet-oauth-perl",
"purl": "pkg:deb/ubuntu/libnet-oauth-perl@0.28-2?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.28-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-oauth-perl",
"binary_version": "0.28-3"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "libnet-oauth-perl",
"purl": "pkg:deb/ubuntu/libnet-oauth-perl@0.28-3?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.28-3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-oauth-perl",
"binary_version": "0.28-3"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "libnet-oauth-perl",
"purl": "pkg:deb/ubuntu/libnet-oauth-perl@0.28-3?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.28-3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-oauth-perl",
"binary_version": "0.28-4"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "libnet-oauth-perl",
"purl": "pkg:deb/ubuntu/libnet-oauth-perl@0.28-4?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.28-4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnet-oauth-perl",
"binary_version": "0.31-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "libnet-oauth-perl",
"purl": "pkg:deb/ubuntu/libnet-oauth-perl@0.31-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.31-1"
]
}
],
"aliases": [],
"details": "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.",
"id": "UBUNTU-CVE-2026-75589",
"modified": "2026-08-20T00:00:00Z",
"published": "2026-08-20T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-75589"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-75589"
},
{
"type": "REPORT",
"url": "https://lists.security.metacpan.org/cve-announce/msg/42818763/"
},
{
"type": "REPORT",
"url": "https://github.com/vurtdev/Net-OAuth/security/advisories/GHSA-g8xr-69p3-gw56"
},
{
"type": "REPORT",
"url": "https://github.com/vurtdev/Net-OAuth/commit/a1a16b58add85668ef4fcda642a486ceed098eba.patch"
},
{
"type": "REPORT",
"url": "https://metacpan.org/release/RRWO/Net-OAuth-0.33/changes"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-75589"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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