Make Legacy
Software
Provably Secure.

Cofibrant is a provable security ADR for AI
exploitation of legacy code, with no code changes and negligible performance impact.

Backed by Entrepreneur First Transpose Platform and angel investors

Where this matters

It’s not about how fast you can patch anymoreBinary exploitation that took nation-states months to develop now takes days with modern AI frameworks. CISA and ENISA have sounded the alarm as vulnerability discovery explodes while time-to-exploit crushes., it’s about how deterministic you can be about your security posture.

“Security teams don’t want more findings to triage, they want problems that go away. Cofibrant’s approach is to eliminate memory corruption exploits at build time.”

Aaron Castor-Katz Principal Security Architect Previously Arctic Wolf Rapid7

IoT/OT Environments

Firmware ships once and runs for a decade, on hardware with no to little room for a rewrite or patch. A guarantee enforced at build time still holds no matter the patching timeline.

Open-Source Software

Millions of lines of C, C++, etc. maintained by volunteers and shipped into everything downstream. We validated our guarantees on FFmpeg, one of the harder real-world targets, at extremely low overhead.

Legacy Codebases

Decades of working legacy code that nobody can afford to rewrite. We harden with no code changes and no new toolchain, so the guarantee enforces in the pipeline you already run.

About

A compiler extension, not a scanner

Cofibrant builds tools that sit in your CI/CD pipeline and make memory-unsafe languages like C, C++, provably secure from exploits like Remote Code Execution via memory corruption.

We don't scan for, remediate, or patch vulnerabilities. We analyse source-code and insert runtime guards in the binary.

IDE
Source control
CI/CD build Guards inserted
Runtime Monitor, then block
Cofibrant
Our team comes with experience from
AmazonCleoImperial College LondonUniversity of OxfordUniversity College LondonGIACMorgan StanleyMcKinsey & CompanyMillennium
How Cofibrant deploys
How Cofibrant deploys A closed circuit of four stages laid out on a grid: you commit your own code to your own pipeline, Cofibrant analyses and hardens the binary, deploying monitor-only first and switching to block mode after, your test suites run with all behaviour preserved, and agentic and third-party testing attack the hardened build before the loop returns to the next commit. MONITOR FIRST THEN BLOCK 01 Commit Deploy your code, behavior preserved, in your CI/CD pipeline with our compiler extension. Monitor mode ships first. Guards report to your SOC what they would have stopped. Once you’re comfortable with the deployment, you can switch to block mode. 02 Analyse + Harden Cofibrant guarantees require no code changes and negligible performance impact. 03 Test Functional tests pass unchanged. Tests hunting memory-corruption RCE stop finding any. 04 AI-Proof Cofibrant’s agentic test suites and third-party testing validate the security of hardened builds. We do this on widely-used open-source code, on our own machines.
What holds in monitor and block

No telemetry

No source, binaries or build logs leave your network. Your data stays yours.

Pinned dependencies

We pin our single open-source dependency to a reviewed release and never follow the head of a branch, so an upstream compromise has no route into your build through us.

Correctness preserved

Enforcements come from an upper bound of program behavior, so correctness is preserved, test suites are unaffected, and the guarantee holds through new releases.

What it changes

Remove a class of risk, not a queue of tickets

Memory-corruption exploits like RCE stops being a category you triage and starts being a category that cannot occur.

Patch on your schedule

Patch deadlines follow what an attacker gains from a bug. Rule out code execution and this class leaves the emergency queue.

Actively exploited RCE 192

of the 689 remote-code-execution entries in CISA’s exploited-vulnerability catalogue reach it through memory corruption.

28% of all exploited RCE.
The race you are running
Attacker ready ~15 days
You have patched 12–24 months
Exposed for the whole window. Firmware in the field, often with no vendor fix.
Your remediation deadline 3days

Remediation deadlines are set by how much control an attacker gains.

Total control This class leaves the emergency queue.

SourcesCounts computed from CISA’s Known Exploited Vulnerabilities catalogue (1,673 entries, August 2026): 689 give remote code execution, and 192 of those reach it through a memory-corruption weakness. Remediation times from Edgescan and field patching data; deadline tiers from BOD 26-04.

How Cofibrant stacks up
Property Patching SAST scanning Rust rewrite Fil-C Cofibrant
Keeps your existing C and C++ sourceyesyesnoyesyes
No new toolchain or runtime to adoptyesyesnonoyes
Negligible performance costyesyesyesnoyes
Covers bugs nobody has found yetnonoyesyesyes
Holds without ongoing tuningnonoyesyesyes
No findings queue to work throughnonoyesyesyes
Everything above, in one buildCofibrant is the only column checked on every row above. Stacking the others does not close the gap: the two approaches that cover undiscovered bugs are the two that cost you your existing build.nonononoyes
Full spatial and temporal memory safetynonoyesyesno

NoteSAST finds real bugs early and we would still run it; it is detection rather than a guarantee, so what it misses stays missed. A Rust rewrite and memory-safe runtime like Fil-C both give full memory safety, a stronger guarantee than we do. However, this comes with heavy engineering or performance overheads while our minimal enforcements guarantee no exploit possible via memory corruption, for example RCE, the most dangerous exploit.

Research For decision makers Technical Prior work

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