libssh2 Heap Out-of-Bounds Read via publickey subsystem
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| libssh2 | libssh2 | affected |
|
| Package | CPE | Advisory | Released Date |
|---|---|---|---|
| Red Hat Hardened Images | |||
| libssh2-main-1.11.1-10.2.hum1 | cpe:/a:redhat:hummingbird:1 | RHSA-2026:46927 | 2026-07-27T00:00:00Z |
| Vendor | Product | Versions | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Libssh2 | Libssh2 |
|
| Source | ID | Title |
|---|---|---|
Debian DLA |
DLA-4773-1 | libssh2 security update |
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.416% probability within 30 days)
| Type | Values Removed | Values Added |
|---|---|---|
| References |
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| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:2.3:a:libssh2:libssh2:*:*:*:*:*:*:*:* |
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Redhat
Redhat hummingbird |
|
| CPEs | cpe:/a:redhat:hummingbird:1 | |
| Vendors & Products |
Redhat
Redhat hummingbird |
|
| References |
| |
| Metrics |
threat_severity
|
threat_severity
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| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Libssh2
Libssh2 libssh2 |
|
| Vendors & Products |
Libssh2
Libssh2 libssh2 |
| Type | Values Removed | Values Added |
|---|---|---|
| Description | libssh2 through 1.11.1, fixed in commit a13bb6c, contains a missing bounds check vulnerability that allows a malicious SSH server to trigger an arbitrary-length heap out-of-bounds read and a free of an uninitialized pointer via the publickey subsystem. In libssh2_publickey_list_fetch(), the version 1 response parser reads a server-controlled comment_len value and advances the parse pointer without verifying sufficient bytes remain in the buffer, causing the out-of-bounds read to leak heap pointers from adjacent allocations defeating ASLR, followed by heap allocator state corruption when the error cleanup path frees an uninitialized pointer from a non-zeroed realloc() region. | |
| Title | libssh2 Heap Out-of-Bounds Read via publickey subsystem | |
| Weaknesses | CWE-125 CWE-908 |
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| References |
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| Metrics |
cvssV3_1
|