Description
A vulnerability has been found in Cesanta Mongoose up to 7.20. This affects the function mg_tls_recv_cert of the file mongoose.c of the component TLS 1.3 Handler. Such manipulation of the argument pubkey leads to heap-based buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 7.21 mitigates this issue. The name of the patch is 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. It is advisable to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Cesanta | Mongoose | 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 | 7.21 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | swupdate | 2025.12+dfsg-10 | — |
| Debian 13 | swupdate | No fix yet | — |
| Debian 12 | swupdate | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | swupdate | No fix yet | — |
| Ubuntu 26.04 LTS | swupdate | No fix yet | — |
| Ubuntu 25.10 | swupdate | No fix yet | — |
| Ubuntu 24.04 LTS | swupdate | No fix yet | — |
| Ubuntu 22.04 LTS | swupdate | No fix yet | — |
References
- VDB-354825 | Cesanta Mongoose TLS 1.3 mongoose.c mg_tls_recv_cert heap-based overflow vdb-entry technical-description
- VDB-354825 | CTI Indicators (IOB, IOC, IOA) signature permissions-required
- Submit #770063 | Cesanta Mongoose 7.20 Heap-based Buffer Overflow third-party-advisory
- https://github.com/cesanta/mongoose/commit/0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1 patch
- https://github.com/cesanta/mongoose/releases/tag/7.21 patch
- https://github.com/cesanta/mongoose/ product