CVE-2026-59848: Allocation of Resources Without Limits or Throttling in Red Hat Red Hat Enterprise Linux 10
A flaw was found in libssh. A malicious SFTP server can send responses for unknown request IDs that libssh clients keep queued indefinitely, causing unbounded memory growth and client-side denial of service.
AI Analysis
Technical Summary
This vulnerability in libssh allows a malicious SFTP server to send responses for unknown request IDs, which libssh clients keep queued indefinitely. This behavior leads to unbounded memory consumption on the client side, resulting in a denial of service condition. The issue is classified under CWE-770 (Allocation of Resources Without Limits or Throttling). Red Hat has released updated libssh packages (version 0.12.1-4.hum1) for Red Hat Hardened Images to fix this flaw. The vulnerability has a CVSS v3.1 base score of 5.3 (medium severity) with network attack vector, low attack complexity, no privileges required, no user interaction, and impacts availability only.
Potential Impact
The vulnerability causes client-side denial of service due to unbounded memory growth when connecting to a malicious SFTP server. There is no impact on confidentiality or integrity. The attack requires no privileges or user interaction and can be executed remotely over the network.
Mitigation Recommendations
Red Hat has released updated libssh packages (libssh-0.12.1-4.hum1) for Red Hat Hardened Images that fix this vulnerability. Users should apply these updates promptly. Until patched, users are advised to avoid connecting to untrusted SFTP servers to mitigate the risk.
CVE-2026-59848: Allocation of Resources Without Limits or Throttling in Red Hat Red Hat Enterprise Linux 10
Description
A flaw was found in libssh. A malicious SFTP server can send responses for unknown request IDs that libssh clients keep queued indefinitely, causing unbounded memory growth and client-side denial of service.
CVSS v3.1
Score 5.3medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in libssh allows a malicious SFTP server to send responses for unknown request IDs, which libssh clients keep queued indefinitely. This behavior leads to unbounded memory consumption on the client side, resulting in a denial of service condition. The issue is classified under CWE-770 (Allocation of Resources Without Limits or Throttling). Red Hat has released updated libssh packages (version 0.12.1-4.hum1) for Red Hat Hardened Images to fix this flaw. The vulnerability has a CVSS v3.1 base score of 5.3 (medium severity) with network attack vector, low attack complexity, no privileges required, no user interaction, and impacts availability only.
Potential Impact
The vulnerability causes client-side denial of service due to unbounded memory growth when connecting to a malicious SFTP server. There is no impact on confidentiality or integrity. The attack requires no privileges or user interaction and can be executed remotely over the network.
Mitigation Recommendations
Red Hat has released updated libssh packages (libssh-0.12.1-4.hum1) for Red Hat Hardened Images that fix this vulnerability. Users should apply these updates promptly. Until patched, users are advised to avoid connecting to untrusted SFTP servers to mitigate the risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-07-07T15:40:24.561Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-59848","vendor":"Red Hat"}]
Threat ID: 6a5f7ac92a4a8d598939c052
Added to database: 07/21/2026, 13:57:29 UTC
Last enriched: 08/13/2026, 13:19:52 UTC
Last updated: 09/04/2026, 12:35:13 UTC
Views: 81
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