ubuntu-cve-2026-40194
Vulnerability from osv_ubuntu
Published
2026-04-10 21:16
Modified
2026-09-15 17:45
Summary
Details
phpseclib is a PHP secure communications library. Starting in 0.1.1 and prior to 3.0.51, 2.0.53, and 1.0.28, phpseclib\Net\SSH2::get_binary_packet() uses PHP's != operator to compare a received SSH packet HMAC against the locally computed HMAC. != on equal-length binary strings in PHP uses memcmp(), which short-circuits on the first differing byte. This is a real variable-time comparison (CWE-208), proven by scaling benchmarks. This vulnerability is fixed in 3.0.51, 2.0.53, and 1.0.28.
Severity
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "php-phpseclib",
"binary_version": "2.0.1-1ubuntu0.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "php-phpseclib",
"purl": "pkg:deb/ubuntu/php-phpseclib@2.0.1-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.1-1",
"2.0.1-1build1",
"2.0.1-1ubuntu0.1~esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "php-seclib",
"binary_version": "1.0.1-3ubuntu0.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "phpseclib",
"purl": "pkg:deb/ubuntu/phpseclib@1.0.1-3ubuntu0.1+esm1?arch=source\u0026distro=esm-apps-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.3.10-3",
"1.0.0-2",
"1.0.0-3",
"1.0.1-1",
"1.0.1-3",
"1.0.1-3ubuntu0.1",
"1.0.1-3ubuntu0.1+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "php-phpseclib",
"binary_version": "2.0.9-1ubuntu0.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "php-phpseclib",
"purl": "pkg:deb/ubuntu/php-phpseclib@2.0.9-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.6-1",
"2.0.7-1",
"2.0.9-1",
"2.0.9-1ubuntu0.1~esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "php-seclib",
"binary_version": "1.0.9-1ubuntu0.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "phpseclib",
"purl": "pkg:deb/ubuntu/phpseclib@1.0.9-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.7-1",
"1.0.8-1",
"1.0.9-1",
"1.0.9-1ubuntu0.1~esm1",
"1.0.9-1ubuntu0.1~esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "php-phpseclib",
"binary_version": "2.0.23-2ubuntu0.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "php-phpseclib",
"purl": "pkg:deb/ubuntu/php-phpseclib@2.0.23-2ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.21-2",
"2.0.23-2",
"2.0.23-2ubuntu0.1~esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "php-seclib",
"binary_version": "1.0.18-2ubuntu0.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "phpseclib",
"purl": "pkg:deb/ubuntu/phpseclib@1.0.18-2ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.16-2",
"1.0.18-2",
"1.0.18-2ubuntu0.1~esm1",
"1.0.18-2ubuntu0.1~esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "php-phpseclib",
"binary_version": "2.0.36-1ubuntu0.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:22.04:LTS",
"name": "php-phpseclib",
"purl": "pkg:deb/ubuntu/php-phpseclib@2.0.36-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.30-2ubuntu1",
"2.0.34-1",
"2.0.35-1",
"2.0.36-1",
"2.0.36-1ubuntu0.1~esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "php-phpseclib3",
"binary_version": "3.0.13-1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:22.04:LTS",
"name": "php-phpseclib3",
"purl": "pkg:deb/ubuntu/php-phpseclib3@3.0.13-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.0.9-1",
"3.0.10-1",
"3.0.12-2",
"3.0.13-1",
"3.0.13-1ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "php-seclib",
"binary_version": "1.0.20-1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:22.04:LTS",
"name": "phpseclib",
"purl": "pkg:deb/ubuntu/phpseclib@1.0.20-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.19-3ubuntu2",
"1.0.19-3ubuntu3",
"1.0.20-1",
"1.0.20-1ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "php-phpseclib",
"binary_version": "2.0.47-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "php-phpseclib",
"purl": "pkg:deb/ubuntu/php-phpseclib@2.0.47-1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.44-1",
"2.0.45-1",
"2.0.46-1",
"2.0.47-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "php-phpseclib3",
"binary_version": "3.0.37-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "php-phpseclib3",
"purl": "pkg:deb/ubuntu/php-phpseclib3@3.0.37-1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.0.21-2",
"3.0.33-1",
"3.0.34-1",
"3.0.35-1",
"3.0.37-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "php-seclib",
"binary_version": "1.0.23-1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:24.04:LTS",
"name": "phpseclib",
"purl": "pkg:deb/ubuntu/phpseclib@1.0.23-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
},
"ranges": [
{
"events": [
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.21-2",
"1.0.22-1",
"1.0.23-1",
"1.0.23-1ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "php-phpseclib",
"binary_version": "2.0.48-3"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "php-phpseclib",
"purl": "pkg:deb/ubuntu/php-phpseclib@2.0.48-3?arch=source\u0026distro=questing"
},
"ranges": [
{
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},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "php-phpseclib3",
"binary_version": "3.0.43-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "php-phpseclib3",
"purl": "pkg:deb/ubuntu/php-phpseclib3@3.0.43-2?arch=source\u0026distro=questing"
},
"ranges": [
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]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "php-seclib",
"binary_version": "1.0.23-6"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "phpseclib",
"purl": "pkg:deb/ubuntu/phpseclib@1.0.23-6?arch=source\u0026distro=questing"
},
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]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "php-phpseclib",
"binary_version": "2.0.51-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "php-phpseclib",
"purl": "pkg:deb/ubuntu/php-phpseclib@2.0.51-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
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{
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"2.0.48-3",
"2.0.49-1",
"2.0.51-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "php-phpseclib3",
"binary_version": "3.0.49-1ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "php-phpseclib3",
"purl": "pkg:deb/ubuntu/php-phpseclib3@3.0.49-1ubuntu1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.0.43-2",
"3.0.44-1",
"3.0.47-1",
"3.0.49-1",
"3.0.49-1ubuntu1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "php-seclib",
"binary_version": "1.0.24-1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:26.04:LTS",
"name": "phpseclib",
"purl": "pkg:deb/ubuntu/phpseclib@1.0.24-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/resolute"
},
"ranges": [
{
"events": [
{
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}
],
"type": "ECOSYSTEM"
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],
"versions": [
"1.0.23-6",
"1.0.24-1",
"1.0.24-1ubuntu0.1~esm1"
]
}
],
"aliases": [],
"details": "phpseclib is a PHP secure communications library. Starting in 0.1.1 and prior to 3.0.51, 2.0.53, and 1.0.28, phpseclib\\Net\\SSH2::get_binary_packet() uses PHP\u0027s != operator to compare a received SSH packet HMAC against the locally computed HMAC. != on equal-length binary strings in PHP uses memcmp(), which short-circuits on the first differing byte. This is a real variable-time comparison (CWE-208), proven by scaling benchmarks. This vulnerability is fixed in 3.0.51, 2.0.53, and 1.0.28.",
"id": "UBUNTU-CVE-2026-40194",
"modified": "2026-09-15T17:45:15Z",
"published": "2026-04-10T21:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-40194"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-40194"
},
{
"type": "REPORT",
"url": "https://github.com/phpseclib/phpseclib/security/advisories/GHSA-r854-jrxh-36qx"
},
{
"type": "REPORT",
"url": "https://github.com/phpseclib/phpseclib/commit/ffe48b6b1b1af6963327f0a5330e3aa004a194ac"
},
{
"type": "REPORT",
"url": "https://github.com/phpseclib/phpseclib/releases/tag/1.0.28"
},
{
"type": "REPORT",
"url": "https://github.com/phpseclib/phpseclib/releases/tag/2.0.53"
},
{
"type": "REPORT",
"url": "https://github.com/phpseclib/phpseclib/releases/tag/3.0.51"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-40194"
]
}
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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