AIKIDO-2026-637095
openmls is vulnerable to Denial of Service (DoS)
65
Medium Risk
This Affects:
openmlsTL;DR
Several hand-written DeserializeBytes implementations compute the unconsumed input remainder by slicing the input at the re-serialized length of the parsed value. When crafted wire bytes make the re-serialized length exceed the number of bytes actually consumed, the slice index moves out of range and the process panics. The affected types, including MlsMessageIn, PublicMessageIn, ProposalIn, Extensions, and AppDataDictionary, are decoded from untrusted input before message authentication, so the crash is remotely triggerable. The fix derives the remainder from the bytes actually consumed instead of the re-serialized length.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application deserializes untrusted MLS wire-format messages on openmls 0.8.1 or earlier.
Background info
openmls is vulnerable to Denial of Service (DoS) in versions 0.0.1 - 0.8.1.
How to fix this
Upgrade the openmls library to the patch version.
Are You Affected?
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SOC 2Compliant
ISO 27001CompliantISO 42001Compliant
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