AIKIDO-2026-982000
cesanta.mongoose is vulnerable to Out-of-bounds Read
75
High Risk
This Affects:
cesanta.mongooseTL;DR
The built-in TLS stack accepts a record whose decrypted size equals the AEAD tag size, leaving no room for the required content-type byte. The remaining-length computation then underflows to a maximum value that persists, causing later handshake steps to treat stale buffer bytes as a trusted, effectively unbounded message. An unauthenticated peer can trigger an attacker-influenced heap over-read and crash the service before authentication. The fix requires records to exceed the tag size.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you use the built-in TLS backend (MG_TLS_BUILTIN).
Background info
cesanta.mongoose is vulnerable to Out-of-bounds Read in versions 7.13 - 7.22.
How to fix this
Upgrade the cesanta.mongoose library to the patch version.
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