Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-73260— Mongoose: Out-of-bounds Read via length-counter underflow in built-in TLS X.509 DER parser

Quick assessment

Affected
cesanta mongoose
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mongoose is an embedded web server and network library. Prior to 7.23, the built-in TLS certificate parser selected by MG_TLS_BUILTIN fails to verify that a long-form DER element length fits within the remaining certificate buffer. In mg_der_to_tlv() and mg_de

CVSS 7.5 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
cesanta mongoose < 7.23 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-73260

Vulnerability Information

Shenlong is analyzing...

Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Mongoose: Out-of-bounds Read via length-counter underflow in built-in TLS X.509 DER parser
Source: CVE Program / CVE List V5
Vulnerability Description
Mongoose is an embedded web server and network library. Prior to 7.23, the built-in TLS certificate parser selected by MG_TLS_BUILTIN fails to verify that a long-form DER element length fits within the remaining certificate buffer. In mg_der_to_tlv() and mg_der_next(), a peer-controlled length can advance the parser beyond the certificate and underflow the remaining uint32_t length, causing mg_tls_parse_cert_der() to continue walking an invalid pointer. An unauthenticated malicious TLS server, or a client presenting a certificate to a server configured for client certificates, can trigger an out-of-bounds read and denial of service during the handshake. This issue is fixed in version 7.23.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
cesanta mongoose < 7.23 -

II. Public POCs for CVE-2026-73260

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-73260

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-73260 (1)

Vendor Pages for CVE-2026-73260 (1)

Other References for CVE-2026-73260 (1)

Same Patch Batch · cesanta · 2026-10-14 · 4 CVEs total

CVE-2026-63626 8.8 HIGH Mongoose: ppp_handle_ipv6cp() uses attacker-controlled length without bounds check — OOB r
CVE-2026-73261 7.5 HIGH Mongoose: handle_opt() missing opts[1] > len check — 1-byte OOB read corrupts TCP MSS, sil
CVE-2026-73252 7.5 HIGH Mongoose: Unauthenticated remote heap out-of-bounds read in built-in TLS: off-by-one lengt

IV. Related Vulnerabilities

Same product: mongoose
Same vendor: cesanta
Same weakness: CWE-125

V. Comments for CVE-2026-73260

No comments yet

Leave a comment