CVE-2026-6985— Cesanta Mongoose TCP Option net_builtin.c handle_opt infinite loop
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I. Basic Information for CVE-2026-6985
Vulnerability Information
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Vulnerability Title
Cesanta Mongoose TCP Option net_builtin.c handle_opt infinite loop
Source: NVD (National Vulnerability Database)
Vulnerability Description
A weakness has been identified in Cesanta Mongoose up to 7.20. This vulnerability affects the function handle_opt of the file /src/net_builtin.c of the component TCP Option Handler. This manipulation of the argument optlen causes infinite loop. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 7.21 is able to resolve this issue. Upgrading the affected component is advised. VulDB has contacted the vendor early and they confirmed quickly, that this issue got fixed already.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Cesanta Mongoose 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cesanta Mongoose是爱尔兰Cesanta公司的一套嵌入式服务器库，它包括TCP、HTTP客户端和服务器、WenSocket客户端和服务器等功能。 Cesanta Mongoose 7.20及之前版本存在安全漏洞，该漏洞源于组件TCP Option Handler中文件/src/net_builtin.c的函数handle_opt对参数optlen操作不当，可能导致无限循环。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-6985
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IV. Related Vulnerabilities
Same product: Mongoose
- CVE-2026-6986
Cesanta Mongoose GCM Authentication Tag tls_aes128.c mg_aes_ - CVE-2026-5246
Cesanta Mongoose P-384 Public Key mongoose.c mg_tls_verify_c - CVE-2026-5245
Cesanta Mongoose mDNS Record mongoose.c handle_mdns_record s - CVE-2026-5244
Cesanta Mongoose TLS 1.3 mongoose.c mg_tls_recv_cert heap-ba - CVE-2026-2968
Cesanta Mongoose Poly1305 Authentication Tag tls_chacha20.c
Same vendor: Cesanta
- CVE-2026-6986
Cesanta Mongoose GCM Authentication Tag tls_aes128.c mg_aes_ - CVE-2026-5246
Cesanta Mongoose P-384 Public Key mongoose.c mg_tls_verify_c - CVE-2026-5245
Cesanta Mongoose mDNS Record mongoose.c handle_mdns_record s - CVE-2026-5244
Cesanta Mongoose TLS 1.3 mongoose.c mg_tls_recv_cert heap-ba - CVE-2018-25193
Mongoose Web Server 6.9 Denial of Service via Socket Connect
Same weakness: CWE-835
- CVE-2026-42310
Pillow: PDF Parsing Trailer Infinite Loop (DoS) - CVE-2026-41511
OpenMcdf has an Infinite loop DoS via crafted CFB directory - CVE-2026-5407
Loop with Unreachable Exit Condition ('Infinite Loop') in Wi - CVE-2026-6536
Loop with Unreachable Exit Condition ('Infinite Loop') in Wi - CVE-2026-6534
Loop with Unreachable Exit Condition ('Infinite Loop') in Wi
V. Comments for CVE-2026-6985
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