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Daily AlpacaHack

A daily CTF challenge with a fun new puzzle every day

What is Daily AlpacaHack?

We publish one simple, beginner-friendly or educational CTF challenge every day!

Join Anytime

Solve within 24 hours of release to appear on the leaderboard.

Not a Competition

Discussion with friends or AI is welcome (account sharing is prohibited).

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Sharing solutions is allowed only after 24 hours have passed since release.

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Today's Challenge
baumroll1234
A slight mistake
Pwn
Hard
7 solves
Submissions (latest 3)
kurgm
kurgm

SOLVED!

Jul 10, 4:12 PM

pppp4649

SOLVED!

Jul 10, 3:51 PM

cat22222

SOLVED!

Jul 10, 3:37 PM

Leaderboard

Try the first challenge

Is this your first CTF? Let's begin by tackling the first challenge released on Daily AlpacaHack.

View challenge
admin
AlpacaHack 2100
Misc
Welcome🌱
1,960 solves
Upcoming challenges reveal the , , and in advance.
Prev

Jul 2026

Next
Solved
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Upcoming
Mon
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Wed
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Fri
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Sun
29
tchentchen
Nano Services
Web
Medium
78 solves
30
minaminaominaminao
Super Short System Exit
Misc
Medium
79 solves
1
admin
Alpaca Nation
Misc
Welcome🌱
175 solves
2
hiikunzhiikunz
Flag is A+B
Crypto
Easy🌱
114 solves
3
tchentchen
Lucky Redirect
Web
Easy🌱
107 solves
4
hiikunzhiikunz
Renda
Rev
Medium
94 solves
5
tchentchen
IP Blocked Secret
Web
Hard
58 solves
6
minaminaominaminao
duplicate entry
Misc
Easy🌱
111 solves
7
hiikunzhiikunz
Lazy RSA
Crypto
Medium
93 solves
8
minaminaominaminao
Let's Poly1305!
Crypto
Medium
71 solves
9
shiragishiragi
private method
Misc
Easy🌱
100 solves
10
hiikunzhiikunz
secret-table-3
Web
Medium
64 solves
11
baumroll1234
A slight mistake
Pwn
Hard
7 solves
12
tan90909090tan90909090
Planned topicC++
Rev
Hard
14
Planned topicJail
Misc
Medium
15
Coming soon
16
Coming soon
17
Planned topicMAC
Crypto
Medium
18
Planned topicCGI
Web
Hard
19
Planned topicStack
Pwn
Hard
20
Coming soon
21
Coming soon
22
Planned topicCache
Web
Medium
23
Coming soon
24
Coming soon
25
Planned topicMAC
Crypto
Hard
26
Planned topicPython
Web
Hard
27
Coming soon
28
Coming soon
29
Coming soon
30
Coming soon
31
Coming soon
2
Coming soon

Want a harder challenge?

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Writeups

kurimochi

Writeup for Let's Poly1305!

kurimochi

ja
Let's Poly1305!

2 hours ago

nitcelcius

Writeup for private method

nirvana

Writeup for private method

ja

17 hours ago

Daily AlpacaHackに挑戦するつくよみちゃん07/08/Let's Poly1305!/minaminao

Daily AlpacaHackに挑戦するつくよみちゃん07/07/Lazy RSA/hiikunz

ja

2026/07/08 15:59

Rows:

HTML2PNG

Topic: CrawlerReleased: Apr 19, 2026

108 solves
Web
Hard4.0

by

tchen

tchen

Render any HTML to PNG!

Beginner Hint
  • The flag is located at /flag-<hash>.txt, so you need to somehow list the files under /. How can you do that?
  • You don't need to RCE for this challenge.
html2png.tar.gz

Please sign in to submit the flag.

descriptionsolveswriteups