RHSA-2026:30132
Vulnerability from csaf_redhat - Published: 2026-06-25 20:59 - Updated: 2026-06-27 08:45Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
libssh2:
* libssh2-1.11.1-9.hum1 (aarch64, x86_64)
* libssh2-devel-1.11.1-9.hum1 (aarch64, x86_64)
* libssh2-docs-1.11.1-9.hum1 (noarch)
* libssh2-1.11.1-9.hum1.src (src)
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's sftp_symlink() function allows a malicious SSH server or man-in-the-middle attacker to trigger an out-of-bounds heap read via a crafted SSH_FXP_NAME response. This can disclose heap memory contents or crash the application, causing a denial of service (DoS).
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
13 references
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"text": "This update includes the following RPMs:\n\nlibssh2:\n * libssh2-1.11.1-9.hum1 (aarch64, x86_64)\n * libssh2-devel-1.11.1-9.hum1 (aarch64, x86_64)\n * libssh2-docs-1.11.1-9.hum1 (noarch)\n * libssh2-1.11.1-9.hum1.src (src)",
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"title": "Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update",
"tracking": {
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"relates_to_product_reference": "Red Hat Hardened Images"
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"vulnerabilities": [
{
"cve": "CVE-2025-15661",
"cwe": {
"id": "CWE-125",
"name": "Out-of-bounds Read"
},
"discovery_date": "2026-06-18T21:00:57.881542+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2490586"
}
],
"notes": [
{
"category": "description",
"text": "A flaw in libssh2\u0027s sftp_symlink() function allows a malicious SSH server or man-in-the-middle attacker to trigger an out-of-bounds heap read via a crafted SSH_FXP_NAME response. This can disclose heap memory contents or crash the application, causing a denial of service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libssh2: libssh2: Information disclosure and denial of service via crafted SFTP response",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Moderate-impact out-of-bounds heap read flaw in libssh2 allows a malicious SSH server or man-in-the-middle attacker to crash the application (DoS) or disclose heap memory by sending a crafted SFTP response.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"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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"url": "https://access.redhat.com/security/cve/CVE-2025-15661"
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"summary": "RHBZ#2490586",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2490586"
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{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-15661",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-15661"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-15661",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-15661"
},
{
"category": "external",
"summary": "https://github.com/libssh2/libssh2/commit/2dae3024897e1898d389835151f4e9606227721d",
"url": "https://github.com/libssh2/libssh2/commit/2dae3024897e1898d389835151f4e9606227721d"
},
{
"category": "external",
"summary": "https://github.com/libssh2/libssh2/pull/1705",
"url": "https://github.com/libssh2/libssh2/pull/1705"
},
{
"category": "external",
"summary": "https://github.com/libssh2/libssh2/pull/1717",
"url": "https://github.com/libssh2/libssh2/pull/1717"
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{
"category": "external",
"summary": "https://www.vulncheck.com/advisories/libssh2-heap-buffer-over-read-via-sftp-symlink-in-sftp-c",
"url": "https://www.vulncheck.com/advisories/libssh2-heap-buffer-over-read-via-sftp-symlink-in-sftp-c"
}
],
"release_date": "2026-06-18T20:18:29.475000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-25T20:59:04+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"
],
"restart_required": {
"category": "none"
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"url": "https://access.redhat.com/errata/RHSA-2026:30132"
},
{
"category": "workaround",
"details": "Implement strict network egress filtering to allow outbound SSH/SFTP traffic only to known, trusted endpoints. Additionally, enforce strict SSH host key checking in your libssh2 client applications to reject unknown servers and prevent Man-in-the-Middle (MitM) attacks.",
"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: Information disclosure and denial of service via crafted SFTP 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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