CVE-2026-5246
highpriority · track · 32EPSS 0.006 · 50 %ileEUUSEPSS · scored 2026-10-27
A vulnerability was determined in Cesanta Mongoose up to 7.20. Affected is the function mg_tls_verify_cert_signature of the file mongoose.c of the component P-384 Public Key Handler. Executing a manipulation can lead to authorization bypass. The attack can be executed remotely. Attacks of this nature are highly complex. The exploitability is told to be difficult. The exploit has been publicly disclosed and may be utilized. Upgrading to version 7.21 is able to address this issue. This patch is called 0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1. 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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–high · 1.7–8.1
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (22)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (19)
External citations — patches, advisories, analysis.
- https://github.com/cesanta/mongoose/cnnvd
- https://github.com/cesanta/mongoose/commit/0d882f1b43ff2308b7486a56a9d60cd6dba8a3f1cnnvd
- https://github.com/cesanta/mongoose/releases/Patchcnnvd
- https://github.com/cesanta/mongoose/releases/tag/7.21cnnvd
- https://vuldb.com/submit/770104cnnvd
- https://vuldb.com/vuln/354827cnnvd
- https://vuldb.com/vuln/354827/cticnnvd
- https://github.com/cesanta/mongoose/enisa_euvd
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