RHSA-2026:46535
Vulnerability from csaf_redhat - Published: 2026-07-27 12:00 - Updated: 2026-08-03 04:07Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
libssh2:
* libssh2-1.11.1-10.1.hum1 (aarch64, x86_64)
* libssh2-devel-1.11.1-10.1.hum1 (aarch64, x86_64)
* libssh2-docs-1.11.1-10.1.hum1 (noarch)
* libssh2-1.11.1-10.1.hum1.src (src)
Security Fix(es):
libssh2:
* CVE-2026-58051
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw in libssh2 allows a malicious SSH server to send a malformed public key response, triggering an invalid memory cleanup. This can cause the connecting client application to crash or leak information.
6.5 (Medium)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:libssh2-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libssh2-main@noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libssh2-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:libssh2-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
References
12 references
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"text": "This update includes the following RPMs:\n\nlibssh2:\n * libssh2-1.11.1-10.1.hum1 (aarch64, x86_64)\n * libssh2-devel-1.11.1-10.1.hum1 (aarch64, x86_64)\n * libssh2-docs-1.11.1-10.1.hum1 (noarch)\n * libssh2-1.11.1-10.1.hum1.src (src)\n\nSecurity Fix(es):\n\nlibssh2:\n * CVE-2026-58051",
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"product_id": "Red Hat Hardened Images:libssh2-main@aarch64"
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"vulnerabilities": [
{
"cve": "CVE-2026-58051",
"cwe": {
"id": "CWE-824",
"name": "Access of Uninitialized Pointer"
},
"discovery_date": "2026-06-28T03:01:08.381727+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2493950"
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],
"notes": [
{
"category": "description",
"text": "A flaw in libssh2 allows a malicious SSH server to send a malformed public key response, triggering an invalid memory cleanup. This can cause the connecting client application to crash or leak information.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libssh2: libssh2: Denial of service or information disclosure via malformed SSH publickey response",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Moderate: This flaw in libssh2 can lead to a denial of service or information disclosure in client applications when connecting to a malicious SSH server. The vulnerability arises from improper handling of uninitialized memory during public key list processing, which an attacker can trigger with a specially crafted response. Exploitation requires active interaction with a compromised or malicious server, limiting the attack surface to untrusted connections.\n\nNote: Red Hat Enterprise Linux (RHEL) 8 and newer are not affected by this flaw, as they do not ship the libssh2 package.",
"title": "Statement"
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"title": "CVSS score applicability"
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"product_status": {
"fixed": [
"Red Hat Hardened Images:libssh2-main@aarch64",
"Red Hat Hardened Images:libssh2-main@noarch",
"Red Hat Hardened Images:libssh2-main@src",
"Red Hat Hardened Images:libssh2-main@x86_64"
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"summary": "Canonical URL",
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"summary": "RHBZ#2493950",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2493950"
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{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-58051",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-58051"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-58051",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-58051"
},
{
"category": "external",
"summary": "https://github.com/bikini/exploitarium/tree/main/libssh2-publickey-list-calc-poc",
"url": "https://github.com/bikini/exploitarium/tree/main/libssh2-publickey-list-calc-poc"
},
{
"category": "external",
"summary": "https://github.com/libssh2/libssh2/blob/master/src/publickey.c",
"url": "https://github.com/libssh2/libssh2/blob/master/src/publickey.c"
},
{
"category": "external",
"summary": "https://www.vulncheck.com/advisories/libssh2-free-of-uninitialized-pointer-in-publickey-list-cleanup",
"url": "https://www.vulncheck.com/advisories/libssh2-free-of-uninitialized-pointer-in-publickey-list-cleanup"
}
],
"release_date": "2026-06-28T01:32:54.283000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-27T12:00:59+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:libssh2-main@aarch64",
"Red Hat Hardened Images:libssh2-main@noarch",
"Red Hat Hardened Images:libssh2-main@src",
"Red Hat Hardened Images:libssh2-main@x86_64"
],
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{
"category": "workaround",
"details": "To mitigate this issue, ensure your applications connect only to trusted and verified SSH servers. For added protection, maintain standard system memory defenses to automatically intercept and safely terminate any processes corrupted by an unexpected server error.",
"product_ids": [
"Red Hat Hardened Images:libssh2-main@aarch64",
"Red Hat Hardened Images:libssh2-main@noarch",
"Red Hat Hardened Images:libssh2-main@src",
"Red Hat Hardened Images:libssh2-main@x86_64"
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:H",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:libssh2-main@aarch64",
"Red Hat Hardened Images:libssh2-main@noarch",
"Red Hat Hardened Images:libssh2-main@src",
"Red Hat Hardened Images:libssh2-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "libssh2: libssh2: Denial of service or information disclosure via malformed SSH publickey response"
}
]
}
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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.
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