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CVE-2026-5244

Cesanta Mongoose TLS 1.3 mongoose.c mg_tls_recv_cert heap-based overflow

Published: Apr 2, 2026Updated: Apr 29, 2026 Sources: CVE List NVDCWE-119
7.3HIGH
NVD MITRE
EPSS Score
0.7%
Top 50.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-119CWE-122

Affected Products

MongooseCesantaOSS Libraries
mongoosecesantaOSS Libraries
cesantaoss-projectOSS Libraries

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
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References

https://vuldb.com/vuln/354825
vuldb.com
https://vuldb.com/vuln/354825/cti
vuldb.com
https://vuldb.com/submit/770063
vuldb.com
and 3 more references View all →

Timeline

Published
Apr 2, 2026
Last Updated
Apr 29, 2026

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