SUSE-SU-2026:22364-1
Vulnerability from csaf_suse - Published: 2026-06-25 11:50 - Updated: 2026-06-25 11:50Summary
Security update for libssh2_org
Severity
Important
Notes
Title of the patch: Security update for libssh2_org
Description of the patch: This update for libssh2_org fixes the following issues
- CVE-2026-55199: pre-Authentication DoS via SSH_MSG_EXT_INFO Handler (bsc#1268530).
- CVE-2026-55200: out-of-Bounds write via Unchecked packet_length in transport.c (bsc#1268531).
Patchnames: SUSE-SLES-16.0-1078
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
5.9 (Medium)
Affected products
Recommended
16 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise Server 16.0:libssh2-1-1.11.1-160000.4.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 16.0:libssh2-1-1.11.1-160000.4.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 16.0:libssh2-1-1.11.1-160000.4.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 16.0:libssh2-1-1.11.1-160000.4.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 16.0:libssh2-devel-1.11.1-160000.4.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 16.0:libssh2-devel-1.11.1-160000.4.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 16.0:libssh2-devel-1.11.1-160000.4.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 16.0:libssh2-devel-1.11.1-160000.4.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP applications 16.0:libssh2-1-1.11.1-160000.4.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP applications 16.0:libssh2-1-1.11.1-160000.4.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP applications 16.0:libssh2-1-1.11.1-160000.4.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP applications 16.0:libssh2-1-1.11.1-160000.4.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP applications 16.0:libssh2-devel-1.11.1-160000.4.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP applications 16.0:libssh2-devel-1.11.1-160000.4.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP applications 16.0:libssh2-devel-1.11.1-160000.4.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP applications 16.0:libssh2-devel-1.11.1-160000.4.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
moderate
8.1 (High)
Affected products
Recommended
16 products, the same list as for
CVE-2026-55199
Threats
Impact
important
References
12 references
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"vulnerabilities": [
{
"cve": "CVE-2026-55199",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-55199"
}
],
"notes": [
{
"category": "general",
"text": "libssh2 through 1.11.1, fixed in commit 1762685, contains a pre-authentication denial of service vulnerability in the SSH_MSG_EXT_INFO handler in src/packet.c that allows a malicious SSH server to cause a client CPU exhaustion loop by sending a crafted extension count value. A malicious server can set nr_extensions to 0xFFFFFFFF during key exchange, causing the client to spin in a tight CPU loop for over 60 seconds because return values from _libssh2_get_string() are unchecked and the session timeout does not apply to CPU-bound loops.",
"title": "CVE description"
}
],
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"summary": "SUSE Bug 1268530 for CVE-2026-55199",
"url": "https://bugzilla.suse.com/1268530"
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"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
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}
],
"scores": [
{
"cvss_v3": {
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
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]
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],
"threats": [
{
"category": "impact",
"date": "2026-06-25T11:50:54Z",
"details": "moderate"
}
],
"title": "CVE-2026-55199"
},
{
"cve": "CVE-2026-55200",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-55200"
}
],
"notes": [
{
"category": "general",
"text": "libssh2 through 1.11.1, fixed in commit 7acf3df contains an out-of-bounds write vulnerability in ssh2_transport_read() that fails to enforce upper bounds on packet_length field. Remote attackers can send crafted SSH packets with excessively large packet_length values to corrupt heap memory and achieve remote code execution.",
"title": "CVE description"
}
],
"product_status": {
"recommended": [
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},
"references": [
{
"category": "external",
"summary": "CVE-2026-55200",
"url": "https://www.suse.com/security/cve/CVE-2026-55200"
},
{
"category": "external",
"summary": "SUSE Bug 1268531 for CVE-2026-55200",
"url": "https://bugzilla.suse.com/1268531"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
"product_ids": [
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],
"scores": [
{
"cvss_v3": {
"baseScore": 8.1,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"date": "2026-06-25T11:50:54Z",
"details": "important"
}
],
"title": "CVE-2026-55200"
}
]
}
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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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