CVE-2026-59844: Memory Allocation with Excessive Size Value in Red Hat Red Hat Enterprise Linux 10
A flaw was found in libssh. A remote authenticated client can issue SSH_FXP_READ requests with an arbitrarily large length, causing a libssh SFTP server to allocate excessive memory and potentially exhaust it through repeated requests.
AI Analysis
Technical Summary
This vulnerability in libssh allows a remote authenticated client to issue SSH_FXP_READ requests with arbitrarily large length values, causing the libssh SFTP server to allocate excessive memory. Repeated exploitation can exhaust system memory, resulting in denial of service. The issue affects Red Hat Hardened Images and is tracked as CVE-2026-59844. Red Hat has released updated libssh RPM packages (version 0.12.1-4.hum1) that fix this issue. The vulnerability has a CVSS v3.1 base score of 6.5, indicating a medium severity with high impact on availability but no impact on confidentiality or integrity.
Potential Impact
The vulnerability can cause denial of service by exhausting server memory due to excessive memory allocation triggered by crafted SFTP read requests. There is no impact on confidentiality or integrity. The attack requires network access and low privileges (authenticated client), with no user interaction needed. This can disrupt availability of the affected SFTP service.
Mitigation Recommendations
Red Hat has released fixed libssh packages (version 0.12.1-4.hum1) for Red Hat Hardened Images. Applying these updates will remediate the vulnerability. No workaround is available, so updating to the fixed packages is the recommended mitigation.
CVE-2026-59844: Memory Allocation with Excessive Size Value in Red Hat Red Hat Enterprise Linux 10
Description
A flaw was found in libssh. A remote authenticated client can issue SSH_FXP_READ requests with an arbitrarily large length, causing a libssh SFTP server to allocate excessive memory and potentially exhaust it through repeated requests.
CVSS v3.1
Score 6.5medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in libssh allows a remote authenticated client to issue SSH_FXP_READ requests with arbitrarily large length values, causing the libssh SFTP server to allocate excessive memory. Repeated exploitation can exhaust system memory, resulting in denial of service. The issue affects Red Hat Hardened Images and is tracked as CVE-2026-59844. Red Hat has released updated libssh RPM packages (version 0.12.1-4.hum1) that fix this issue. The vulnerability has a CVSS v3.1 base score of 6.5, indicating a medium severity with high impact on availability but no impact on confidentiality or integrity.
Potential Impact
The vulnerability can cause denial of service by exhausting server memory due to excessive memory allocation triggered by crafted SFTP read requests. There is no impact on confidentiality or integrity. The attack requires network access and low privileges (authenticated client), with no user interaction needed. This can disrupt availability of the affected SFTP service.
Mitigation Recommendations
Red Hat has released fixed libssh packages (version 0.12.1-4.hum1) for Red Hat Hardened Images. Applying these updates will remediate the vulnerability. No workaround is available, so updating to the fixed packages is the recommended mitigation.
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-2026-59844","vendor":"Red Hat"}]
Threat ID: 6a5f622e2a4a8d598918bddd
Added to database: 07/21/2026, 12:12:30 UTC
Last enriched: 08/13/2026, 13:19:07 UTC
Last updated: 08/31/2026, 10:52:10 UTC
Views: 72
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.