CVE-2026-115473
Mongoose: Heap OOB reads and null-byte bypass in mg_path_is_sane (util.c)
Mongoose is an embedded web server and network library. Prior to 7.22, mg_path_is_sane in src/util.c read path.buf[1] without first requiring path.len to be at least two and read s[2] when only two bytes remained. Unauthenticated remote requests reaching mg_http_upload or mg_http_serve_dir with the affected short path shapes could therefore trigger one-byte heap out-of-bounds reads. On bare-metal or RTOS targets without memory protection, the adjacent byte could be exposed or influence whether a path was accepted, and instrumented builds could crash. This issue is fixed in version 7.22.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| mongoose cesanta |
< 7.22 (affected) | CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 6.5 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/cesanta/mongoose/security/advisories/GHSA-cjmx-764f-286cCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/cesanta/mongoose/commit/b55de8b151d1466a3e41d1f854f22eeb6faa23dcCNA: GitHub_M · x_refsource_MISC
- https://github.com/cesanta/mongoose/releases/tag/7.22CNA: GitHub_M · x_refsource_MISC
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