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Title: Assessing Claude Mythos Preview’s cybersecurity capabilities \ Anthropic

Open Graph Title: Assessing Claude Mythos Preview’s cybersecurity capabilities

X Title: Assessing Claude Mythos Preview’s cybersecurity capabilities

Description: Claude Mythos Preview is a new general-purpose language model that is strikingly capable at computer security tasks. This post provides technical details for researchers and practitioners who want to understand exactly how we have been testing this model, and what we have found over the past month.

Open Graph Description: Claude Mythos Preview is a new general-purpose language model that is strikingly capable at computer security tasks. This post provides technical details for researchers and practitioners who want to understand exactly how we have been testing this model, and what we have found over the past month.

X Description: Claude Mythos Preview is a new general-purpose language model that is strikingly capable at computer security tasks. This post provides technical details for researchers and practitioners who want to understand exactly how we have been testing this model, and what we have found over the past month.

X: @AnthropicAI

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Domain: red.anthropic.com

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coordinated vulnerability disclosurehttps://www.anthropic.com/coordinated-vulnerability-disclosure
now-patchedhttps://ftp.openbsd.org/pub/OpenBSD/patches/7.8/common/025_sack.patch.sig
stack-smashing exploitshttps://en.wikipedia.org/wiki/Stack_buffer_overflow
JIT heap sprayhttps://en.wikipedia.org/wiki/JIT_spraying
wrotehttps://red.anthropic.com/2026/firefox/
OSS-Fuzz corpushttps://github.com/google/oss-fuzz
emergedhttps://red.anthropic.com/2026/exploit/
software fuzzershttps://en.wikipedia.org/wiki/Fuzzing
Pointers are real. They’re what the hardware understands.https://www.usenix.org/system/files/1311_05-08_mickens.pdf
Address Sanitizerhttps://www.usenix.org/conference/atc12/technical-sessions/presentation/serebryany
we tested Opus 4.6 and sehttps://www.anthropic.com/news/mozilla-firefox-security
nt Firefox 112 bugshttps://www.anthropic.com/news/mozilla-firefox-security
our prior vulnerability-finding exerciseshttps://www.anthropic.com/news/mozilla-firefox-security
coordinated vulnerability disclosure operating principleshttps://www.anthropic.com/coordinated-vulnerability-disclosure
 set out how we report the vulnerabilities that Mythos Preview surfaces.https://www.anthropic.com/coordinated-vulnerability-disclosure
commithttps://en.wikipedia.org/wiki/Commitment_scheme
90 plus 45 dayshttps://www.anthropic.com/coordinated-vulnerability-disclosure
Ahttps://ftp.openbsd.org/pub/OpenBSD/patches/7.8/common/025_sack.patch.sig
27-year-oldhttps://ftp.openbsd.org/pub/OpenBSD/patches/7.8/common/025_sack.patch.sig
 OpenBSD bughttps://ftp.openbsd.org/pub/OpenBSD/patches/7.8/common/025_sack.patch.sig
RFC 793https://www.ietf.org/rfc/rfc793.txt
RFC 2018https://datatracker.ietf.org/doc/html/rfc2018
Ahttps://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/22499/files
16-year-oldhttps://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/22499/files
 FFmpeg vulnerabilityhttps://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/22499/files
entire research papershttps://www.usenix.org/system/files/usenixsecurity23-vasquez_1.pdf
in 2010https://github.com/FFmpeg/FFmpeg/commit/c988f97566
FFmpeg 8.1https://git.ffmpeg.org/gitweb/ffmpeg.git/shortlog/n8.1
VMMshttps://en.wikipedia.org/wiki/Hypervisor
NFShttps://en.wikipedia.org/wiki/Network_File_System
CVE-2026-4747https://nvd.nist.gov/vuln/detail/CVE-2026-4747
an independent vulnerability research companyhttps://github.com/califio/publications/blob/main/MADBugs/CVE-2026-4747/write-up.md
required human guidancehttps://github.com/califio/publications/blob/main/MADBugs/CVE-2026-4747/claude-prompts.txt
RFC 2203https://datatracker.ietf.org/doc/html/rfc2203
Return Oriented Programminghttps://en.wikipedia.org/wiki/Return-oriented_programming
e2f78c7ec165https://github.com/torvalds/linux/commit/e2f78c7ec1655fedd945366151ba54fcb9580508
critical vulnerabilityhttps://github.com/randombit/botan/security/advisories/GHSA-v782-6fq4-q827
Syzkallerhttps://github.com/google/syzkaller
slab-out-of-bounds readhttps://syzkaller.appspot.com/bug?extid=58c872f7790a4d2ac951
35f56c554eb1https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=35f56c554eb1b56b77b3cf197a6b00922d49033d
5aa57d9f2d53https://github.com/torvalds/linux/commit/5aa57d9f2d53
2e95c4384438https://github.com/torvalds/linux/commit/2e95c4384438
Project Glasswinghttps://anthropic.com/glasswing
announcementhttps://anthropic.com/glasswing
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Given enough eyeballs, all bugs are shallow.https://en.wikipedia.org/wiki/Linus%27s_law
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SHA-3 competitionhttps://en.wikipedia.org/wiki/NIST_hash_function_competition
launchedhttps://nvlpubs.nist.gov/nistpubs/ir/2016/nist.ir.8105.pdf
cryptographic commitmentshttps://en.wikipedia.org/wiki/Commitment_scheme
pre-image resistance of SHA-3https://en.wikipedia.org/wiki/Preimage_attack
previously-published exploitation walkthroughshttps://pwning.tech/nftables/
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