| CVE |
Vendors |
Products |
Updated |
CVSS v3.1 |
| openwrt/asu is an image on demand server for OpenWrt based distributions. The request hashing mechanism truncates SHA-256 hashes to only 12 characters. This significantly reduces entropy, making it feasible for an attacker to generate collisions. By exploiting this, a previously built malicious image can be served in place of a legitimate one, allowing the attacker to "poison" the artifact cache and deliver compromised images to unsuspecting users. This can be combined with other attacks, such as a command injection in Imagebuilder that allows malicious users to inject arbitrary commands into the build process, resulting in the production of malicious firmware images signed with the legitimate build key. This has been patched with 920c8a1. |
| ### 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) |
| Web installer integrity check used weak hash algorithm. The following products are affected: Acronis Cyber Protect 16 (Windows) before build 39169. |
| free-one-api allows users to access large language model reverse engineering libraries through the standard OpenAI API format. In versions up to and including 1.0.1, MD5 is used to hash passwords before sending them to the backend. MD5 is a cryptographically broken hashing algorithm and is no longer considered secure for password storage or transmission. It is vulnerable to collision attacks and can be easily cracked using modern hardware, exposing user credentials to potential compromise. As of time of publication, a replacement for MD5 has not been committed to the free-one-api GitHub repository. |
| 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. |
| Due to outdated Hash algorithm, HCL Glovius Cloud could allow attackers to guess the input data using brute-force or dictionary attacks efficiently using modern hardware such as GPUs or ASICs |
| An unauthenticated attacker can abuse the weak hash of the backup generated by the wwwdnload.cgi endpoint to gain unauthorized access to sensitive data, including password hashes and certificates. |
| A security flaw has been discovered in Tenda AX9 22.03.01.46. This affects the function image_check of the component httpd. The manipulation results in use of weak hash. It is possible to launch the attack remotely. A high complexity level is associated with this attack. It is indicated that the exploitability is difficult. The exploit has been released to the public and may be used for attacks. |
| The application uses a weak password hash function, allowing an attacker to crack the weak password hash to gain access to an FTP user account. |
| A vulnerability was determined in Tomofun Furbo 360 and Furbo Mini. The impacted element is an unknown function of the file /etc/shadow of the component Password Handler. Executing manipulation can lead to use of weak hash. The physical device can be targeted for the attack. The attack requires a high level of complexity. The exploitability is regarded as difficult. The exploit has been publicly disclosed and may be utilized. The firmware versions determined to be affected are Furbo 360 up to FB0035_FW_036 and Furbo Mini up to MC0020_FW_074. The vendor was contacted early about this disclosure but did not respond in any way. |
| The TeleMessage service through 2025-05-05 relies on MD5 for password hashing, which opens up various attack possibilities (including rainbow tables) with low computational effort. |
| pnpm is a package manager. Prior to version 10.0.0, the path shortening function uses the md5 function as a path shortening compression function, and if a collision occurs, it will result in the same storage path for two different libraries. Although the real names are under the package name /node_modoules/, there are no version numbers for the libraries they refer to. This issue has been patched in version 10.0.0. |
| Dragonfly is an open source P2P-based file distribution and image acceleration system. Prior to 2.1.0, the DragonFly2 uses a variety of hash functions, including the MD5 hash, for downloaded files. This allows attackers to replace files with malicious ones that have a colliding hash. This vulnerability is fixed in 2.1.0. |
| Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.1, 10.9.x <= 10.9.3 fail to properly validate cache keys for link metadata which allows authenticated users to access unauthorized posts and poison link previews via hash collision attacks on FNV-1 hashing |
| IBM Sterling Secure Proxy 6.0.0.0 through 6.0.3.1, 6.1.0.0 through 6.1.0.0, and 6.2.0.0 through 6.2.0.1 uses weaker than expected cryptographic algorithms that could allow an attacker to decrypt highly sensitive information. |
| beego is an open-source web framework for the Go programming language. Versions of beego prior to 2.3.4 use MD5 as a hashing algorithm. MD5 is no longer considered secure against well-funded opponents due to its vulnerability to collision attacks. Version 2.3.4 replaces MD5 with SHA256. |
| A weak hashing algorithm and small sizes of seeds/secrets in Google's gVisor allowed for a remote attacker to calculate a local IP address and a per-boot identifier that could aid in tracking of a device in certain circumstances. |
| In JetBrains TeamCity before 2025.07 password reset and email verification tokens were using weak hashing algorithms |
| Medtronic Valleylab Exchange Client version 3.4 and below, Valleylab FT10 Energy Platform (VLFT10GEN) software version 4.0.0 and below, and Valleylab FX8 Energy Platform (VLFX8GEN) software version 1.1.0 and below use the descrypt algorithm for OS password hashing. While interactive, network-based logons are disabled, and attackers can use the other vulnerabilities within this report to obtain local shell access and access these hashes. |
| JavaEZ is a library that adds new functions to make Java easier. A weakness in JavaEZ 1.6 allows force decryption of locked text by unauthorized actors. The issue is NOT critical for non-secure applications, however may be critical in a situation where the highest levels of security are required. This issue ONLY affects v1.6 and does not affect anything pre-1.6. The vulnerability has been patched in release 1.7. Currently, there is no way to fix the issue without upgrading. |
