I met FX many years ago during a Black Hat event. At the time, I was working on a class of vulnerabilities related to zip archives. Not only did he know exactly what I was on to, but he was able to articulate the actual issue and explain what was happening behind the scenes and why my exploit was working.
A true legend.
nbk_2000•Mar 2, 2026
It's been a long time, but I've always cherished our late night conversations at the Alexis Park. Truly a great hacker. RIP my friend
BoredPositron•Mar 2, 2026
World got a little darker today. Rip my friend.
alexcos•Mar 2, 2026
Reminds me of the Pirates of the Caribbean quote: "The world used to be a bigger place."
"The world's still the same. There's just... less in it."
hcbdbdrb•Mar 2, 2026
While he was a dividing personality with strong opinions, he had his heart in the right place
RIP
TonyTrapp•Mar 2, 2026
Dividing? Are you sure you are not thinking of fefe, who has a somewhat similar real name?
ephou7•Mar 2, 2026
He was a good hacker but also a HUGE, arrogant jerk who treated a lot of people quite badly.
cc-d•Mar 2, 2026
What do you mean by this?
Are you sure it was him? And not an external, perhaps undocumented and extremely illegal, system affecting his actions and behaviour?
krater23•Mar 2, 2026
fuck
cc-d•Mar 2, 2026
fugg
KellyCriterion•Mar 2, 2026
vakk
a2800276•Mar 2, 2026
Very sad news to hear. People of his caliber are sorely needed in the community. My condolences to everyone close to fefe.
pentamassiv•Mar 2, 2026
Fefe is a different person
KellyCriterion•Mar 2, 2026
Came here to ask the same question / conclusion.
It was thin to find out the differences between the two.
Though, FeFe also suffered some health issues lately, IIRC?
davrosthedalek•Mar 2, 2026
Yeah, he had a stroke. Not many updates, unfortunately.
a2800276•Mar 2, 2026
Yes, I mistyped, Freudian slip. And I can't edit or delete anymore. I'm terribly sorry.
sllabres•Mar 2, 2026
I'm really sad, even if I never met him personally and only knew him from his talks, his software and of course his blog.
I had hoped that after his illness he would be granted some time for personal life and recovery — which makes this news all the more shocking.
Deeg9rie9usi•Mar 2, 2026
FX != fefe
sllabres•Mar 2, 2026
Thanks for the clarification
cc-d•Mar 2, 2026
I never really knew felix, but mob says he was a pretty cool guy, and we miss him already.
Thank you felix for everything you did for mob :)
GabrielTFS•Mar 2, 2026
Sad news. I wonder if his projects (e.g. dietlibc) will continue development or not...
Deeg9rie9usi•Mar 2, 2026
FX != fefe
nwellnhof•Mar 2, 2026
The dietlibc author is a different person but with a very similar name.
14 Comments
I met FX many years ago during a Black Hat event. At the time, I was working on a class of vulnerabilities related to zip archives. Not only did he know exactly what I was on to, but he was able to articulate the actual issue and explain what was happening behind the scenes and why my exploit was working.
A true legend.
RIP
Are you sure it was him? And not an external, perhaps undocumented and extremely illegal, system affecting his actions and behaviour?
It was thin to find out the differences between the two.
Though, FeFe also suffered some health issues lately, IIRC?
I had hoped that after his illness he would be granted some time for personal life and recovery — which makes this news all the more shocking.
Thank you felix for everything you did for mob :)
fx = Felix Lindner
Please don't mix up the names and nicknames.
Both are highly renowned security experts.