Weakness (CWE)
CWE-772: Missing Release of Resource after Effective Lifetime
The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.
How to prevent it (3 mitigations)
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Requirements
Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
For example, languages such as Java, Ruby, and Lisp perform automatic garbage collection that releases memory for objects that have been deallocated.
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Implementation
It is good practice to be responsible for freeing all resources you allocate and to be consistent with how and where you free resources in a function. If you allocate resources that you intend to free upon completion of the function, you must be sure to free the resources at all exit points for that function including error conditions.
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Operation, Architecture and Design
Use resource-limiting settings provided by the operating system or environment. For example, when managing system resources in POSIX, setrlimit() can be used to set limits for certain types of resources, and getrlimit() can determine how many resources are available. However, these functions are not available on all operating systems.
When the current levels get close to the maximum that is defined for the application (see CWE-770), then limit the allocation of further resources to privileged users; alternately, begin releasing resources for less-privileged users. While this mitigation may protect the system from attack, it will not necessarily stop attackers from adversely impacting other users.
Ensure that the application performs the appropriate error checks and error handling in case resources become unavailable (CWE-703).
Source: MITRE CWE-772
152 results · Feed
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High 8.8
Improper release of expired privileged access checkouts in the PAM scheduled check-in task in Devolutions Server 2025.3…
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Medium 4.3
FreeRDP before 3.32.2 File Descriptor Exhaustion via Parallel CREATE
FreeRDP from 3.0.0 before 3.32.2 contains a file descriptor leak in parallel_process_irp_create that fails to close previous descriptors on repeated IRP_MJ_CREATE requests. A hostile RDP server with parallel-device redirection enabled can send repeated CREATE…
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High 8.7
NetX Secure DTLS server allocates a session for each new source before the cookie exchange and never reclaims it, so spoofed datagrams exhaust the session pool
In Eclipse ThreadX NetX Duo versions 6.0 through 6.5.2.202603a, the NetX Secure DTLS server allocates a session from its fixed session pool for the first datagram from any unrecognised address and port, before the cookie exchange, and never releases a session…
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Medium 5.3
Unauthenticated Ad Hoc Transfer Resource Exhaustion in Progress WS_FTP Server
A missing release of backend receiver sessions in the Ad Hoc Transfer component of Progress Software WS_FTP Server versions prior to 2024.0.7 and 2025.0.4 on Windows could lead to server resource exhaustion and service degradation.
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High 8.7
Resource exhaustion from RPC sessions kept for requests to unknown interface
P-Net before 1.0.3 does not release the RPC session allocated for an RPC request that names an unknown interface or object UUID, and does not start a timeout for it. Repeated requests with different activity UUIDs exhaust the available sessions. Once they are…
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High 8.7
Resource exhaustion from unreleased AR and RPC session on RPC requests with incorrect endianness
P-Net before 1.0.3 does not release the Application Relationship (AR) and the RPC session when an RPC request is rejected because its data representation has incorrect endianness. The session and its AR remain allocated, so repeated requests exhaust the avail…
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High 8.2
Echo: WebSocket proxy can retain connections and handlers after client disconnect
Echo is a Go web framework. From 4.15.0 until 4.16.1 and 5.4.1, Echo's Proxy middleware can retain a handler, copy goroutines, and network connections after a WebSocket client disconnects when the upstream keeps its connection open. The raw proxy waits for bo…
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Medium 4.3
Bluetooth Host connection reservation leak when multiple connectable advertising sets share an identity
The Bluetooth host pre-allocates a bt_conn object (a "reservation") from the fixed acl_conns[] pool for every connectable advertising set it starts, in le_adv_start_add_conn() in subsys/bluetooth/host/adv.c. When an incoming peripheral connection completes, f…
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Low 3.3
Podman: goroutine/file-descriptor leak in storage/pkg/archive.applylayer and applyuncompressedlayer on malformed layers
storage/pkg/archive.ApplyLayer and ApplyUncompressedLayer may, when processing corrupt or malicious inputs, leak a file descriptor; unbounded repeated calls can exhaust the process’ file descriptor limit
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Medium 6.8
Deleting a user-mode module thread leaks its privileged kernel stack
One logical thread of a user-mode ThreadX module costs the Module Manager's shared object pool two allocations, not one. The module asks for a `TX_THREAD` control block through `txm_module_object_allocate`; `_txm_module_manager_thread_create` then takes a sec…
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Medium 5.9
Nfs-utils: nfs-utils: denial of service via memory leak in rpc.statd
A flaw was found in nfs-utils. An unauthenticated remote attacker can trigger a Denial of Service (DoS) by sending repeated state notification requests to an exposed rpc.statd service. The service fails to properly release memory allocated during callback pro…
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Medium 6.9
MCP Python SDK: Unbounded Session Accumulation in StreamableHTTP Transport Enables Resource Exhaustion
The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). From 1.8.0 until 1.30.0 and 2.2.0, stateful Streamable HTTP servers, including FastMCP, MCPServer, Server.streamable_http_app(), and StreamableHTTPSessionM…
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Low 3.7
Denial of Service via sending bogus X.509 certificates
Libreswan in FIPS mode has a vulnerability where badly formed received certificates are rejected, but not deleted from the NSS cache. As a result, any real certificates with the same serial number are rejected as well. This can be abused to lock out legitimat…
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Medium 5.7
Bluetooth Mesh Access layer permanently leaks delayable-message contexts, disabling all model responses
The Bluetooth Mesh Access layer delayable-message machinery in subsys/bluetooth/mesh/delayable_msg.c manages a static pool of CONFIG_BT_MESH_ACCESS_DELAYABLE_MSG_COUNT message contexts (default 4) threaded onto a free_ctx or busy_ctx list. release_delayable_m…
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Medium 4.5
IBM Power Systems Firmware Denial of Service
IBM Power Systems Firmware FW1110.00 through FW1110.31, FW1120.00 through FW1120.01, and FW1060.00 through FW1060.81 could allow a remote authenticated attacker to cause a denial of service by exhausting connection resources due to improper resource managemen…
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Medium 6.5
Bluetooth LE Controller: retained RX node leak and reachable assertion in the PHY Update procedure
The Link Layer Control Procedure (LLCP) implementation of the Zephyr software Bluetooth LE Controller retains the receive node that carried an accepted LL_PHY_UPDATE_IND so that it can later be reused for the host notification when the update instant is reach…
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Medium 6.5
Bluetooth LE controller leaks a retained RX node when an unexpected LL Control PDU arrives during a Connection Update
The Bluetooth Link Layer control procedure code in subsys/bluetooth/controller/ll_sw/ull_llcp_conn_upd.c retains the received RX node while a Connection Update / Connection Parameter procedure waits for its instant, so the node can later carry the host notifi…
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Medium 5.3
OWASP Coraza WAF: Resource exhaustion via deferred file handle accumulation in multipart body processor
OWASP Coraza WAF is a golang modsecurity compatible web application firewall library. From 3.0.0 until 3.8.0, the multipart loop in internal/bodyprocessors/multipart.go executes defer temp.Close() for every uploaded file part, so each temporary-file descripto…
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Medium 6.8
Missing release of passed file descriptors in illumos nscd allows local users to exhaust kernel memory
A missing release of resources in the illumos name service cache daemon (nscd) allows a local user to exhaust kernel memory. The nscd door server procedure, switcher() in usr/src/cmd/nscd/nscd_frontend.c, does not close file descriptors that are passed with a…
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High 7.5
Pydantic AI: Concurrency-limited models can keep their slot when a streamed request ends early
Pydantic AI is a Python agent framework for building applications and workflows with Generative AI. From 2.10.0 until 2.53.0, streamed requests made through ConcurrencyLimitedModel or limit_model_concurrency can retain shared concurrency slots because anyio.C…
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Medium 4.7
Sssd: sssd: denial of service via race condition in autofs responder
A flaw was found in SSSD. A local user can trigger a Denial of Service (DoS) by exploiting a race condition in the autofs responder between asynchronous enumeration completion and map invalidation. By repeatedly sending concurrent map enumeration and invalida…
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Medium 5.5
Sssd: sssd: denial of service via memory exhaustion in kcm responder
A flaw was found in SSSD. An issue in the Kerberos Credential Manager (KCM) responder allows a local user to cause a Denial of Service (DoS) by maintaining a persistent connection and repeatedly storing and destroying credentials. Because the service fails to…
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Medium 5.5
Sssd: sssd: denial of service via memory exhaustion in autofs responder
A flaw was found in SSSD. In configurations where the autofs responder service is enabled, memory allocated during successful request processing is not released until the client connection terminates. A local attacker can exploit this vulnerability by maintai…
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High 8.2
Apache Thrift: Java `TSaslNonblockingServer` `Computation.run` orphans a connection on a pre-auth parse error
improper handling of exceptional conditions, Missing release of resource after effective lifetime vulnerability in Apache Thrift java bindings. This issue affects Apache Thrift: before 0.25.0. Users are recommended to upgrade to version 0.25.0, which fixes th…
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High 8.7
Apache Thrift: C++ `THeaderTransport::untransform()` leaks the zlib stream on the error path
Missing release of memory after effective lifetime, Missing release of resource after effective lifetime vulnerability in Apache Thrift THeaderTransport. This issue affects Apache Thrift: before 0.25.0. Users are recommended to upgrade to version 0.25.0, whic…
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High 7.1
NULL Pointer Dereference on MSRP Attribute Table Exhaustion
In Eclipse ThreadX NetX Duo versions 6.4.0 through 6.5.2.202603a, built with VLAN and SRP support, the MSRP attribute lookup writes through the null pointer returned by its allocator when the ten-entry attribute table is full. An unauthenticated station on th…
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Medium 5.5
VxWorks 7 Memory Resource leak
Wind River VxWorks 7 prior to 26.09, specific system call arguments can result in the IPNET subsystem failing to properly release allocated kernel memory and system file descriptors before terminating the calling application. Fixed in Version 26.09.
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High 7.5
Apache Tomcat: WebSocket DoS due to lost asynchronous write timeout
Missing release of resource after effective lifetime, Comparison using wrong factors vulnerability in Apache Tomcat allows a denial of service as a result of lost time outs for asynchronous WebSocket writes. This issue affects Apache Tomcat: from 11.0.0-M1 th…
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Medium 5.3
vLLM through 0.29.0 Resource Exhaustion via Ownerless Mooncake Transfer Placeholders
vLLM through 0.29.0 contains a resource exhaustion vulnerability in MooncakeConnector where rejected prefill requests create ownerless transfer placeholders that are never reclaimed. Attackers can send rejected requests to exhaust sender task pools, causing v…
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High 7.5
Apache Karaf: Improper release of ClassLoader references via static ThreadLocal caching
Apache Karaf's XmlUtils cached XML parser/transformer factories in static ThreadLocal fields on long-lived container threads. Because a ThreadLocal value outlives the OSGi bundle that created it, repeated bundle or feature install, update, or refresh operatio…
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Medium 5.9
AsyncHttpClient: Connection permit leak on TLS handshake failure causes per-host denial of service
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. From 3.0.8 until 3.0.12, a client with maxConnections or maxConnectionsPerHost set above zero leaks one connection permit whe…
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High 7.5
InternLM LMDeploy through 0.17.0 Memory Exhaustion via Session ID Mismatch
InternLM LMDeploy through 0.17.0 in DistServe prefill/decode disaggregation mode fails to release scheduler sessions because the proxy uses user-facing session IDs instead of internal scheduler keys. Unauthenticated attackers can send completion requests to t…
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High 8.6
Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software for Firepower 3100 and 4200 Series DTLS Denial of Service Vulnerability
A vulnerability in Datagram TLS (DTLS) message handling of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software for Cisco Secure Firewall 3100 Series and 4200 Series devices could allow an un…
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High 7.5
RMCP: Unauthenticated permanent session-table leak in rmcp Streamable HTTP server transport leads to remote denial-of-service
RMCP is an official Rust SDK for the Model Context Protocol. Prior to 2.0.0, the rmcp crate's stateful Streamable HTTP server in crates/rmcp/src/transport/streamable_http_server/tower.rs allows an unauthenticated client to send a well-formed JSON-RPC POST tha…
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Medium 4.7
Windows Secure Socket Tunneling Protocol (SSTP) Denial of Service Vulnerability
Missing release of resource after effective lifetime in Windows Secure Socket Tunneling Protocol (SSTP) allows an authorized attacker to deny service locally.
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Medium 5.9
undici vulnerable to Denial of Service via orphaned RetryHandler response body
undici's retry handler can leave an already-exposed response body pending forever. When a server returns a successful response that declares a Content-Length, sends only part of the body, and closes the connection, the retry handler retries the request. If th…
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High 8.7
httpd parks a request worker indefinitely on a malformed chunk size sent after the headers
Missing Release of Resource after Effective Lifetime vulnerability in Erlang/OTP inets httpd allows an unauthenticated remote attacker to cause denial of service by sending a request with a chunked body whose chunk-size line is not a hexadecimal number. The w…
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High 8.7
httpd applies no timeout while receiving a request body, parking a worker on a stalled client
Missing Release of Resource after Effective Lifetime vulnerability in Erlang/OTP inets httpd allows an unauthenticated remote attacker to cause denial of service by sending valid request headers with a large Content-Length and then stalling before the body is…
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Medium 6.5
In Spring AMQP the link credit never replenished on listener exception path
When a container-level ErrorHandler is configured (the mitigation for finding 221000), each delivery whose processing throws still permanently consumes one link credit. After initialCredits (default 100) failing messages the receiver's credit reaches zero and…
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High 7.5
libp2p: Circuit relay v2 server reservation refresh leaks abort listeners and allows remote resource exhaustion
libp2p is a JavaScript implementation of the libp2p networking stack. Prior to version 4.2.9, the reservation refresh path in reservation-store.ts reuses the same retimeableSignal but unconditionally registers another abort listener on every refresh. As a res…