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Daily Edition · Page 5

THE DAILY INDEX

Technology, AI, software, security, crypto and business

GENERAL

TLDR InfoSec

TLDR InfoSec

DISCOURSE IMAGEMAGICK VULNERABILITY ENABLES ARBITRARY FILE READ THROUGH MALICIOUS IMAGE UPLOADS

Security researchers disclosed CVE-2026-55420, a critical vulnerability in Discourse enabling arbitrary file read and write operations through malicious image uploads. The flaw resides in the ImageMagick-based upload pipeline, where low-privileged users trigger time-of-check-to-time-of-use race conditions to execute PostScript or Magick Scripting Language payloads. Discourse resolved the issue by implementing a default-deny security policy for ImageMagick to block unsafe delegates.

gbhackers.com · 3 min

TLDR InfoSec

META SAYS HACKERS TOOK CODE AND PERSONAL DATA OF 1500 PEOPLE IN GITHUB BREACH

Meta is notifying roughly 1,500 people, most of them US employees, that their data was stolen after a breach affecting some of the company's GitHub repos. Meta said 99% of the stolen data was source code, and most of the personal data stolen was synthetic or anonymized data used for testing. Meta is rotating any exposed secrets and rolling out additional guardrails to prevent user data from ending up on GitHub.

links.tldrnewsletter.com · 2 min

TLDR InfoSec

ZERO TO CALC IN SIX DAYS: INSIDE XBOW'S CHROME FULL CHAIN

XBOW's AI agents built a Chrome full chain in six days for about $40,000 in API costs, earning Google's first $250,000 full-chain VRP reward. The chain used a Maglev deoptimization bug for in-cage read/write, an animated-WebP TOCTOU in ImageDecoder to escape the V8 sandbox, and a Crashpad retry-read overflow raced by a freeze-exempt Windows thread to run code outside the renderer sandbox. Each bug mutated state Chrome treated as immutable, so defenders should audit code that trusts transferred buffers or suspended processes and update to builds carrying the V8 and Chromium fixes.

xbow.com · 15 min

TLDR InfoSec

CVE-2026-81983: INTEGER OVERFLOW VULNERABILITY ENABLES OUT-OF-BOUNDS WRITE IN ADOBE ACROBAT

Remedio found an out-of-bounds write in Acrobat.dll. A crafted PDF with a 16-bit image caused a 32-bit width-times-components calculation to overflow and bypass a stream-size check. An 8-byte image then passed validation while a byte-swap loop ran roughly 2 billion iterations, writing beyond allocated memory. Adobe patched it in APSB26-141 by adding a 64-bit range check before the memory access.

remedio.io · 9 min

TLDR InfoSec

ANTHROPIC CONJURES ANOTHER THREAT THAT DOESN'T EXIST YET TO STOKE FEARS OF AI APOCALYPSE

Anthropic says a 9-billion-parameter model ran distributed inference on eight of nine hardware types. Its GLM-5.2 test copied Llama3.1-8B to seven or eight emulated Android nodes in five trials. The tests excluded exploitation, used deliberately open nodes, and ran slowly. Other open-weight models failed end-to-end replication. Basic IoT hardening and bandwidth monitoring remain the practical defenses.

theregister.com · 3 min

TLDR IndexPage 5