A high-severity security flaw has been disclosed in MongoDB that might enable unauthenticated customers to learn uninitialized heap reminiscence.
The vulnerability, tracked as CVE-2025-14847 (CVSS rating: 8.7), has been described as a case of improper dealing with of size parameter inconsistency, which arises when a program fails to appropriately deal with eventualities the place a size subject is inconsistent with the precise size of the related information.
“Mismatched size fields in Zlib compressed protocol headers might enable a learn of uninitialized heap reminiscence by an unauthenticated consumer,” in line with an outline of the flaw in CVE.org.
The flaw impacts the next variations of the database –
- MongoDB 8.2.0 by way of 8.2.3
- MongoDB 8.0.0 by way of 8.0.16
- MongoDB 7.0.0 by way of 7.0.26
- MongoDB 6.0.0 by way of 6.0.26
- MongoDB 5.0.0 by way of 5.0.31
- MongoDB 4.4.0 by way of 4.4.29
- All MongoDB Server v4.2 variations
- All MongoDB Server v4.0 variations
- All MongoDB Server v3.6 variations
The difficulty has been addressed in MongoDB variations 8.2.3, 8.0.17, 7.0.28, 6.0.27, 5.0.32, and 4.4.30.
“An client-side exploit of the Server’s zlib implementation can return uninitialized heap reminiscence with out authenticating to the server,” MongoDB stated. “We strongly suggest upgrading to a hard and fast model as quickly as potential.”
If fast replace isn’t an possibility, it is advisable to disable zlib compression on the MongoDB Server by beginning mongod or mongos with a networkMessageCompressors or a web.compression.compressors possibility that explicitly omits zlib. The opposite compressor choices supported by MongoDB are snappy and zstd.
“CVE-2025-14847 permits a distant, unauthenticated attacker to set off a situation through which the MongoDB server might return uninitialized reminiscence from its heap,” OP Innovate stated. “This might consequence within the disclosure of delicate in-memory information, together with inner state info, pointers, or different information that will help an attacker in additional exploitation.”
