CVE-2026-73251
mongoose: Mongoose Built-in TLS: CA-bundle certificate chain accepted without any signature verification
Severity by source
Trivy's own label is CRITICAL. Rated critical by NVD, Red Hat, Julia.
Description
Mongoose is an embedded web server and network library. Prior to 7.23, a network attacker can impersonate a TLS server to a Mongoose client configured with a multi-certificate CA bundle. In src/tls_builtin.c, the mg_tls_init() function stores the bundle in tls->ca_bundle_der while tls->ca_der.len remains zero, and mg_tls_recv_cert() uses tls_bundle_find() to accept a Common Name match without calling mg_tls_verify_cert_signature(). A forged self-signed certificate can therefore satisfy hostname and CertificateVerify checks and enable interception, credential disclosure, traffic modification, and malicious responses. This issue is fixed in version 7.23.
Affected packages and fixed versions
| Source | Package | Fixed in |
|---|---|---|
| julia::Julia Ecosystem Security Advisories | Mongoose_jll | no fix listed |
| debian 14 | mongoose | 7.23+ds-1 |
| rapidfort fedora 43 | mongoose, mongoose-devel, mongoose-lib | 3.1-30.fc43 |
Show all 5 entries from 3 sources
| Source | Package | Fixed in |
|---|---|---|
| julia::Julia Ecosystem Security Advisories | Mongoose_jll | no fix listed |
| debian 14 | mongoose | 7.23+ds-1 |
| rapidfort fedora 43 | mongoose | 3.1-30.fc43 |
| rapidfort fedora 43 | mongoose-devel | 3.1-30.fc43 |
| rapidfort fedora 43 | mongoose-lib | 3.1-30.fc43 |
References
- https://access.redhat.com/security/cve/CVE-2026-73251
- https://github.com/cesanta/mongoose/commit/2988bc9df3a5efc9539471cb7455975fa25df483
- https://github.com/cesanta/mongoose/releases/tag/7.23
- https://github.com/cesanta/mongoose/security/advisories/GHSA-qj6j-2692-v2r8
- https://nvd.nist.gov/vuln/detail/CVE-2026-73251
- https://www.cve.org/CVERecord?id=CVE-2026-73251