CVE-2026-94029
published 2026-09-30CVE-2026-94029: Server-side memory exhaustion in Apache MINA SSHD 1.0.0 to 2.19.0 and 3.0.0-M1 to 3.0.0-M5, component sshd-sftp, in the SFTP v6…
PriorityP337medium6.5CVSS 3.1
AVNACLPRLUINSUCNINAH
EPSS
0.38%
30.9th percentile
Server-side memory exhaustion in Apache MINA SSHD 1.0.0 to 2.19.0 and 3.0.0-M1 to 3.0.0-M5, component sshd-sftp, in the SFTP v6 check-file-name/check-file-handle extension. Apache MINA SSHD is a Java library for client-side and server-side SSH.
Using a very small "block size" (for instance 256, which is the minimum) on a huge file generates many (file size / block size) hashes. The resulting SFTP reply message was accumulated fully in memory server-side, which could, with a suitably large (possibly sparse) file exhaust the server-side memory, taking down the server.
Users are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue by imposing a maximum limit on the size of the reply. Many SFTP implementations have a general limit on the size of SFTP messages anyway; typically 256kB as in OpenSSH or also in Apache MINA SSHD.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| apache_software_foundation | apache_mina_sshd | >= 1.0.0 < 2.20.0 | 2.20.0 |
| apache_software_foundation | apache_mina_sshd | >= 3.0.0-M1 < 3.0.0-M6 | 3.0.0-M6 |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vendor_redhat6.5MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
GHSA
Server-side memory exhaustion in Apache MINA SSHD 1.0.0 to 2.19.0 and 3.0.0-M1 to 3.0.0-M5, component sshd-sftp, in the SFTP v6 check-file-name/check-file-handle extension.
ghsa_unreviewed·2026-09-30
CVE-2026-94029 [MEDIUM] CWE-770 Server-side memory exhaustion in Apache MINA SSHD 1.0.0 to 2.19.0 and 3.0.0-M1 to 3.0.0-M5, component sshd-sftp, in the SFTP v6 check-file-name/check-file-handle extension.
Server-side memory exhaustion in Apache MINA SSHD 1.0.0 to 2.19.0 and 3.0.0-M1 to 3.0.0-M5, component sshd-sftp, in the SFTP v6 check-file-name/check-file-handle extension. Apache MINA SSHD is a Java library for client-side and server-side SSH.
Using a very small "block size" (for instance 256, which is the minimum) on a huge file generates many (file size / block size) hashes. The resulting SFTP reply message was accumulated fully in memory server-side, which could, with a suitably large (possibly sparse) file exhaust the server-side memory, taking down the server.
Users are recommended to upgrade to version 2.20.0 or 3.0.0-M6, which fix this issue by imposing a maximum limit on the size of the reply. Many SFTP implementations have a general limit on the size of SFTP messages anyway;
Red Hat
org.apache.sshd/sshd-sftp: Apache MINA SSHD: Denial of Service via memory exhaustion in SFTP check-file extension
vendor_redhat·2026-09-30·CVSS 6.5
CVE-2026-94029 [MEDIUM] CWE-770 org.apache.sshd/sshd-sftp: Apache MINA SSHD: Denial of Service via memory exhaustion in SFTP check-file extension
org.apache.sshd/sshd-sftp: Apache MINA SSHD: Denial of Service via memory exhaustion in SFTP check-file extension
A flaw was found in Apache MINA SSHD. When processing SSH File Transfer Protocol (SFTP) check-file extensions, the server accumulates file hash verification responses entirely in memory without enforcing a size limit. An authenticated remote attacker can exploit this vulnerability by requesting file verification with a minimal block size on a large file, leading to memory exhaustion and a Denial of Service (DoS).
Statement: A flaw was found in Apache MINA SSHD's SFTP v6 check-file-name and check-file-handle extension implementation. When an authenticated SFTP user specifies a very small block size (for instance 256 bytes, which is the minimum) on a large file, the server gene
No detection rules found.
No public exploits indexed.
2026-09-30
Published