Mongoose: Heap OOB reads and null-byte bypass in mg_path_is_sane (util.c)

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-115473
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-04 22:17:50 UTC
Updated2026-11-05 20:17:42 UTC
DescriptionMongoose 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

EPSS: 0.002640000 probability, percentile 0.183110000 (date 2026-11-05)

Problem Types: CWE-125 | CWE-158 | CWE-125 CWE-125: Out-of-bounds Read | CWE-158 CWE-158: Improper Neutralization of Null Byte or NUL Character

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cesanta Mongoose affected < 7.22 Not specified

References

ReferenceSourceLinkTags
github.com/cesanta/mongoose/releases/tag/7.22 [email protected] github.com
github.com/cesanta/mongoose/security/advisories/GHSA-cjmx-764f-286c 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/cesanta/mongoose/commit/b55de8b151d1466a3e41d1f854f22eeb6faa23dc [email protected] github.com
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