CVE-2026-89021
MediumCVSS 6.9Exploitation Probability (EPSS)
Low risk29th percentile - higher than 29% of all known CVEs
Summary
MikroTik RouterOS before 7.24.2 contains a path traversal vulnerability in the container package OCI/tar image extraction. An attacker can write files outside the container root by supplying a crafted image with symlinks pointing to arbitrary paths. Via /container/add, this allows root-privileged file creation, directory creation, file deletion via overlayfs whiteout, and hardlink creation on the persistent data partition without starting the container. The 7.23.x long-term branch does not contain the fix.
Risk Assessment
An attacker can write, delete, and hardlink files with root privileges outside the container, potentially leading to full system compromise. The vulnerability also affects the 7.23.x long-term branch, which will not receive the fix.
Recommendation
Update RouterOS to version 7.24.2 or later from the stable branch. If using the 7.23.x long-term branch, plan migration to the stable branch as the fix will not be backported.
Other vulnerabilities in MikroTik RouterOS
See all- CVE-2026-67278Critical
MikroTik RouterOS (7.x) accepts malformed RSA/PKCS#1 v1.5 signatures across RSA-based services, including TLS/X.509 certificate validation and SSH host-key authentication. Because the trust store includes an e=3 root CA, an attacker controlling or redirecting outbound TLS can use the root's public certificate to forge a trusted intermediate and issue certificates for arbitrary hostnames, enabling TLS server impersonation. This also undermines RSA-based SSH authentication.
- CVE-2018-14847CriticalActively exploited
MikroTik RouterOS through 6.42 allows unauthenticated remote attackers to read arbitrary files and remote authenticated attackers to write arbitrary files due to a directory traversal vulnerability in the WinBox interface.
- CVE-2018-7445CriticalActively exploited
A buffer overflow was found in the MikroTik RouterOS SMB service when processing NetBIOS session request messages. A remote attacker with access to the service can exploit this vulnerability to gain code execution on the system, and the overflow occurs before authentication, so an unauthenticated remote attacker can exploit it.
- CVE-2026-89035High
MikroTik RouterOS through 7.24.5 contains a session token replay vulnerability in the WebFig interface that allows attackers to bypass authentication by replaying captured session tokens across new ECDH sessions. The makeSessionKey function in libucrypto.so generates tokens using fixed salts without channel- or session-specific input, and the user service validates tokens without verifying channel context, enabling stolen tokens to grant persistent administrative access until the token store is explicitly cleared.
- CVE-2026-112158Medium
A weakness has been identified in MikroTik RouterOS up to 6.40.5/6.44/7.20.8. The same_check function in ipt_SAME.ko can lead to an integer overflow. The attack may be launched remotely.
- CVE-2026-103903High
An incorrect authorization vulnerability in the WinBox authentication flow of MikroTik RouterOS allows a remote authenticated attacker with low-privilege credentials to obtain the authorization policy of a different account, such as admin, without knowing the password.
- CVE-2026-93345High
MikroTik RouterOS before 7.25beta4 contains an improper input validation vulnerability in the labelled-VPN NLRI iterators of the routing service. An unauthenticated on-path attacker can send a malformed MP_REACH_NLRI UPDATE message with a prefix-length value below the minimum valid for a labelled-VPN NLRI, which passes validation while describing a route with a negative-length address portion. The fix is carried only in 7.25beta4 (a development build); the current stable release 7.24.2 and the long-term release 7.23.5 both remain affected.
- CVE-2025-56566Medium
MikroTik firmware 7.19.4 stores sensitive authentication credentials and network state in cleartext within non-volatile storage. An attacker with physical access to the device can extract this material from an SPI flash dump without authenticating and without knowing the administrative password.
- CVE-2026-89028High
MikroTik RouterOS before 7.24 contains a heap memory corruption vulnerability in the userspace SMB daemon that allows remote attackers to corrupt adjacent heap memory by supplying a crafted uniPwdLen value in the SMB1 SessionSetupAndX handler. An attacker can send a malformed SMB1 request with a uniPwdLen field that triggers an integer underflow, causing the resulting value to be used as the copy length in a memory copy operation into a smaller heap buffer, corrupting adjacent heap memory.
- CVE-2026-89020Medium
MikroTik RouterOS before 7.23.4 (long-term) and 7.24.2 (stable) contains a stack-based buffer overflow vulnerability in the mtget binary's TFTP RRQ builder function, allowing authenticated users to crash the mtget worker process by supplying a URL path of 507 bytes or more to the /tool fetch command.
Original NVD description (English source)
MikroTik RouterOS before 7.24.2 contains a path traversal vulnerability in the container package OCI/tar image extraction that allows attackers to write files outside the container root by supplying a crafted container image with symlinks pointing to arbitrary paths. Attackers can exploit unsanitized tar member path extraction during container import via /container/add to achieve root-privileged file creation, directory creation, file deletion via overlayfs whiteout, and hardlink creation on the persistent data partition without ever starting the container. The 7.23.x long-term branch does not contain this fix; the container binaries in container-7.23.3.npk and container-7.23.4.npk are byte-identical. The vendor has confirmed that the issue is not resolved in the long-term release and that the fix is carried forward only in the stable branch from 7.24.2 onward, with no backport to the long-term branch planned.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS