CVE-2026-5244
Last modified
CVE-2026-5244 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.73% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Cesanta | Mongoose | >= 7.0, < 7.21 |
References
- https://github.com/cesanta/mongoose/releases/tag/7.21Product, Release Notes
- https://vuldb.com/submit/770063Exploit, Third Party Advisory, VDB Entry
- https://vuldb.com/vuln/354825Third Party Advisory, VDB Entry
- https://vuldb.com/vuln/354825/ctiPermissions Required, VDB Entry
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-5244?
How severe is CVE-2026-5244?
How do I fix CVE-2026-5244?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-5238A weakness has been identified in itsourcecode Payroll Manag…7.3
- CVE-2026-5240A security vulnerability has been detected in code-projects …4.3
- CVE-2026-5241A vulnerability in the LightGlue model loading path of huggi…9.6
- CVE-2026-5242Improper neutralization of formula elements in a CSV file vu…8.8
- CVE-2026-5243The The Plus Addons for Elementor – Addons for Elementor, Pa…6.4
- CVE-2026-52439An issue in xiandafu beetl 3.20.2 allows a remote attacker t…9.8
- CVE-2026-5245A vulnerability was found in Cesanta Mongoose up to 7.20. Th…8.1
- CVE-2026-5246A vulnerability was determined in Cesanta Mongoose up to 7.2…8.1
- CVE-2026-52466Open Library Foundation VuFind v11.0.3 and v4.1 is vulnerabl…9.8
- CVE-2026-52469SQL injection vulnerability in Crocus v.1.3.44 allows a remo…9.8
- CVE-2026-5247The Schedule Post Changes With PublishPress Future plugin fo…5.5
- CVE-2026-52470SQL injection vulnerability in Crocus v.1.3.44 allows a remo…9.8
Are you affected by CVE-2026-5244?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST