| CVE |
Vendors |
Products |
Updated |
CVSS v3.1 |
| ### Impact
When this library is used to deserialize messagepack data from an untrusted source, there is a risk of a denial of service attack by an attacker that sends data contrived to produce hash collisions, leading to large CPU consumption disproportionate to the size of the data being deserialized.
This is similar to [a prior advisory](https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-7q36-4xx7-xcxf), which provided an inadequate fix for the hash collision part of the vulnerability.
### Patches
The following steps are required to mitigate this risk.
1. Upgrade to a version of the library where a fix is available.
1. Review the steps in [this previous advisory](https://github.com/MessagePack-CSharp/MessagePack-CSharp/security/advisories/GHSA-7q36-4xx7-xcxf) to ensure you have your application configured for untrusted data.
### Workarounds
If upgrading MessagePack to a patched version is not an option for you, you may apply a manual workaround as follows:
1. Declare a class that derives from `MessagePackSecurity`.
2. Override the `GetHashCollisionResistantEqualityComparer<T>` method to provide a collision-resistant hash function of your own and avoid calling `base.GetHashCollisionResistantEqualityComparer<T>()`.
3. Configure a `MessagePackSerializerOptions` with an instance of your derived type by calling `WithSecurity` on an existing options object.
4. Use your custom options object for all deserialization operations. This may be by setting the `MessagePackSerializer.DefaultOptions` static property, if you call methods that rely on this default property, and/or by passing in the options object explicitly to any `Deserialize` method.
### References
- Learn more about best security practices when reading untrusted data with [MessagePack 1.x](https://github.com/MessagePack-CSharp/MessagePack-CSharp/tree/v1.x#security) or [MessagePack 2.x](https://github.com/MessagePack-CSharp/MessagePack-CSharp#security).
- The .NET team's [discussion on hash collision vulnerabilities of their `HashCode` struct](https://github.com/GrabYourPitchforks/runtime/blob/threat_models/docs/design/security/System.HashCode.md).
### For more information
If you have any questions or comments about this advisory:
* [Start a public discussion](https://github.com/MessagePack-CSharp/MessagePack-CSharp/discussions)
* [Email us privately](mailto:andrewarnott@live.com) |
| This vulnerability exists in AppSamvid software due to the usage of a weaker cryptographic algorithm (hash) SHA1 in user login component. An attacker with local administrative privileges could exploit this to obtain the password of AppSamvid on the targeted system.
Successful exploitation of this vulnerability could allow the attacker to take complete control of the application on the targeted system. |
| The certificate and private key used for providing transport layer security for connections to the web interface (TCP port 443) is hard-coded in the firmware and are shipped with the update files. An attacker can use the private key to perform man-in-the-middle attacks against users of the admin interface. The files are located in /etc/ssl (e.g. salia.local.crt, salia.local.key and salia.local.pem). There is no option to upload/configure custom TLS certificates. |
| RLPx 5 has two CTR streams based on the same key, IV, and nonce. This can facilitate decryption on a private network. |
| An issue was discovered in Kaseya Rapid Fire Tools Network Detective through 2.0.16.0. A vulnerability exists in the EncryptionUtil class because symmetric encryption is implemented in a deterministic and non-randomized fashion. The method Encrypt(byte[] clearData) derives both the encryption key and the IV from a fixed, hardcoded input by using a static salt value. As a result, identical plaintext inputs always produce identical ciphertext outputs. This is true for both FIPS and non-FIPS generated passwords. In other words, there is a cryptographic implementation flaw in the password encryption mechanism. Although there are multiple encryption methods grouped under FIPS and non-FIPS classifications, the logic consistently results in predictable and reversible encrypted outputs due to the lack of per-operation randomness and encryption authentication. |
| HCL DRYiCE Optibot Reset Station is impacted by a missing Strict Transport Security Header. This could allow an attacker to intercept or manipulate data during redirection. |
| php-censor v2.1.4 and fixed in v.2.1.5 was discovered to utilize a weak hashing algorithm for its remember_key value. This allows attackers to bruteforce to bruteforce the remember_key value to gain access to accounts that have checked "remember me" when logging in. |
| The Fedora Secure Boot CA certificate shipped with shim in Fedora was expired which could lead to old or invalid signed boot components being loaded. |
| A security vulnerability has been detected in FNKvision Y215 CCTV Camera 10.194.120.40. This issue affects the function crypt of the file /etc/passwd. The manipulation leads to use of weak hash. The attack can only be performed from a local environment. The complexity of an attack is rather high. The exploitability is assessed as difficult. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way. |
| Reusing a nonce, key pair in encryption issue exists in "FreeFrom - the nostr client" App versions prior to 1.3.5 for Android and iOS. If this vulnerability is exploited, the content of direct messages (DMs) between users may be manipulated by a man-in-the-middle attack. |
| An issue was discovered on Swissphone DiCal-RED 4009 devices. An attacker with access to the file /etc/deviceconfig may recover the administrative device password via password-cracking methods, because unsalted MD5 is used. |
| An unauthenticated remote attacker could exploit the used, insecure TLS 1.0 and TLS 1.1 protocols to intercept and manipulate encrypted communications between the Com-Server and connected systems. |
| This vulnerability exists in Tapo C500 Wi-Fi camera due to hard-coded RSA private key embedded within the device firmware. An attacker with physical access could exploit this vulnerability to obtain cryptographic private keys which can then be used to perform impersonation, data decryption and man in the middle attacks on the targeted device. |
| Unitree Go2, G1, H1, and B2 devices through 2025-09-20 decrypt BLE packet data by using the df98b715d5c6ed2b25817b6f2554124a key and the 2841ae97419c2973296a0d4bdfe19a4f IV. |
| LangChain4j-AIDeepin is a Retrieval enhancement generation (RAG) project. Prior to 3.5.0, LangChain4j-AIDeepin uses MD5 to hash files, which may cause file upload conflicts. This issue is fixed in 3.5.0. |
| A vulnerability in the SageMaker Workflow component of aws/sagemaker-python-sdk allows for the possibility of MD5 hash collisions in all versions. This can lead to workflows being inadvertently replaced due to the reuse of results from different configurations that produce the same MD5 hash. This issue can cause integrity problems within the pipeline, potentially leading to erroneous processing outcomes. |
| Use of hard-coded cryptographic key issue exists in AIPHONE IX SYSTEM, IXG SYSTEM, and System Support Software. A network-adjacent unauthenticated attacker may log in to SFTP service and obtain and/or manipulate unauthorized files. |
| A weakness has been identified in DJI Mavic Spark, Mavic Air and Mavic Mini 01.00.0500. Affected is an unknown function of the component Telemetry Channel. Executing manipulation can lead to use of hard-coded cryptographic key
. The attacker needs to be present on the local network. A high complexity level is associated with this attack. The exploitability is told to be difficult. The exploit has been made available to the public and could be exploited. This vulnerability only affects products that are no longer supported by the maintainer. |
| ESPTouch is a connection protocol for internet of things devices. In the ESPTouchV2 protocol, while there is an option to use a custom AES key, there is no option to set the IV (Initialization Vector) prior to versions 5.3.2, 5.2.4, 5.1.6, and 5.0.8. The IV is set to zero and remains constant throughout the product's lifetime. In AES/CBC mode, if the IV is not properly initialized, the encrypted output becomes deterministic, leading to potential data leakage. To address the aforementioned issues, the application generates a random IV when activating the AES key starting in versions 5.3.2, 5.2.4, 5.1.6, and 5.0.8. This IV is then transmitted along with the provision data to the provision device. The provision device has also been equipped with a parser for the AES IV. The upgrade is applicable for all applications and users of ESPTouch v2 component from ESP-IDF. As it is implemented in the ESP Wi-Fi stack, there is no workaround for the user to fix the application layer without upgrading the underlying firmware. |
| Padding oracle attack vulnerability in Oberon microsystem AG’s ocrypto library in all versions since 3.1.0 and prior to 3.9.2 allows an attacker to recover plaintexts via timing measurements of AES-CBC PKCS#7 decrypt operations. |
