CVE-2025-8277
Low
Description
A flaw was found in libssh's handling of key exchange (KEX) processes when a client repeatedly sends incorrect KEX guesses. The library fails to free memory during these rekey operations, which can gradually exhaust system memory. This issue can lead to crashes on the client side, particularly when using libgcrypt, which impacts application stability and availability.
SeverityLow
CVSS3.1
Exploit probability—
Product
Libssh
PublishedSep 9, 2025
First seenSep 9, 2025
Weakness typeCWE-401CWE-401
How to fix
Update
- libssh0.11.3 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| libssh | 0.6.0 ≤ v < 0.11.3 | 0.11.3 |
| enterprise_linux 9 | No range specified | — |
| Red Hat Red Hat Enterprise Linux 10 | No range specified | — |
| Red Hat Red Hat Enterprise Linux 7 | No range specified | — |
| Red Hat Red Hat Enterprise Linux 8 | No range specified | — |
| Red Hat Red Hat OpenShift Container Platform 4 | No range specified | — |
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