Cesanta Mongoose up to 7.20 mDNS Record mongoose.c handle_mdns_record buf stack-based overflow

Summaryinfo

A vulnerability labeled as critical has been found in Cesanta Mongoose up to 7.20. Affected is the function handle_mdns_record of the file mongoose.c of the component mDNS Record Handler. Executing a manipulation of the argument buf can lead to stack-based overflow. This vulnerability is handled as CVE-2026-5245. The attack can be executed remotely. Additionally, an exploit exists. The affected component should be upgraded. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Detailsinfo

A vulnerability classified as critical was found in Cesanta Mongoose up to 7.20. This vulnerability affects the function handle_mdns_record of the file mongoose.c of the component mDNS Record Handler. The manipulation of the argument buf with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect confidentiality, integrity, and availability.

This vulnerability was named CVE-2026-5245. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known.

It is declared as proof-of-concept. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Upgrading to version 7.21 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• Cesanta

Name

• Mongoose

Version

• 7.0
• 7.1
• 7.2
• 7.3
• 7.4
• 7.5
• 7.6
• 7.7
• 7.8
• 7.9
• 7.10
• 7.11
• 7.12
• 7.13
• 7.14
• 7.15
• 7.16
• 7.17
• 7.18
• 7.19
• 7.20

License

• open-source

Website

• Product: https://github.com/cesanta/mongoose/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Submitinfo

Accepted

• Submit #770103: Cesanta Mongoose 7.20 Stack-based Buffer Overflow (by the_evilsocket)

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion