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Actively exploited sandbox RCE in all Chromium versions

nvd.nist.gov

411–420 of 528 posts

Re: Actively exploited sandbox RCE in all Chromium versions

#411

How many Heartbleeds[1] must software users and our national security interests endure before the industry treats memory safety as a best practice for systems with exposure to the Internet? The V8 vulnerability being exploited today, CVE-2026-85046, is listed in NVD under CWE-843, "Access of Resource Using Incompatible Type ('Type Confusion')."[2] On this class of vulnerabilities, MITRE explains: > When a memory buff…

This was a type confusion bug in generated JIT code, not in C++ code.

Re: Actively exploited sandbox RCE in all Chromium versions

#412

Earlier quoted context omitted.

That's really informative but maybe a little overly capitalist-brained. We shouldn't look to the black market as cost discovery for these vulnerabilities, most non-criminal researchers are not putting up an ask order and letting the black market compete with Google.

> We shouldn't look to the black market as cost discovery for these vulnerabilities We absolutely should. One of the points of bug bounties is to discourage people from selling to the black market.

The black market also prices in a risk premium for ‘this is illegal and you could go to jail for selling me this’.

Google is only paying for the vulnerability; the exploit market is also paying for your mortal soul.

Re: Actively exploited sandbox RCE in all Chromium versions

#413

Let's take a moment to talk about the monetary value of this vulnerability. According to the Chrome release page ( https://chromereleases.googleblog.com/2026/09/stable-channel... ), Google paid a researcher $1000 for ethically reporting this. The CVE associated with it (CVE-2026-85046) is already being exploited in the wild. If we put our thinking caps on, how much do you think this vulnerability is actually worth? H…

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Re: Actively exploited sandbox RCE in all Chromium versions

#414
post #92

Earlier quoted context omitted.

If the vulnerability is already being exploited in the wild --- as in, it's a vector people already know about and are tracking --- it's possibly not worth much at all. Vulnerability valuations depend heavily on the lifespan of the vulnerability; payments on black market are tranched (explicitly or less explicitly, as with "maintenance payments") based on whether they're patched. Further: a vulnerability is probably…

I was under the impression that the three letter agencies and contractors bought vulnerabilities?

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Re: Actively exploited sandbox RCE in all Chromium versions

#415
post #257

> Type confusion in V8 Fortunately I disabled js by default. Unfortunately, it breaks about 30% of the web. Including nvd.nist.gov, which shows a completely blank page without js enabled, even though with js it’s just a simple page with only static content.

> Unfortunately, it breaks about 30% of the web. More like 99% I use Firefox with Noscript and I'm _totally aware_ that almost no website works without allowing it JS. Even using Noscript it's becoming more and more exhausting every year, it's plain impossible to browse the internet without JS at all.

The problem is that a lot of frontend web dev is driven by the React ecosystem which requires you to have SSR figured out for "no js on the client" to even partially work, which, if you ever tried to go all the way (e.g. RR v7 w/ full SSR) in a not-a-toy project, is not easy to set up and think about by any means, because your server has to be a js one at which point your entire server-side solution consist of node or node-like js server, postgres or mysql (with pooled connections through something like mysql2 and probably drizzle), something for caching like Redis, some complex process manager like pm2... i say complex because if you want to have a high performance fault tolerant gracefully restarting automatic new code deploying system ... and all of that with caching layer(s), Redis sending cache updates without you polling etc., you have to implement and test these yourself... Everything async and thinking in long term running processes and thinking about the async loop instead of a "php-like" model. Components being a potential source of memory leaks, thinking about components having to work on client and server environments, keeping SSR performance (in the sense of component rendering complexity) up etc.

This is not something just anyone is going to rush into. Bigger teams or js/ts evangelists will eventually arrive at that point if they're running something where no-js (really a side effect of seo goals) is important, but "normal people" will spend this time and engineering effort elsewhere.

I think the industry in general is moving past React, as now, and definitely in near future, the only thing that matters is ideas, the rest is for the LLMs to figure out, and so the "frameworks" are going to completely disappear from people's minds as "programming" essentially becomes "telling the AI what to do" and the AI writes asm or even binary. That is when, no JS, may become more viable again lol.

People, including me, resist it, but in the future "programming" is not going to be about writing code (or even checking it, we're way too slow and error-prone to do that), but about coming up with ideas of how to capture real world problems in an IT system, and how to solve those problems by existing (or novel) ways, picking the right tools for the job (say a statistician picking the fitting metric to capture some property of the system that will actually project meaningful observability improvements and not be "just a bunch of noise") and making the right architectural decisions in terms of correctness, performance, scope, taking into account deadlines and budget. And being the domain model glue. Everything else, all the nitty gritty we used to call programming, all the , is going to be done by AI ... it's a mag 9.5 quake tsunami and it can't be stopped now.

This might completely wipe out things like React (which are largely made for humans writing the code, not for humans consuming the output of that code) faster than anyone thought possible.

Re: Actively exploited sandbox RCE in all Chromium versions

#418
post #65

Earlier quoted context omitted.

Among other things, JavaScript in the browser has no way to even express "kill PID 1234 on the user's machine" or "list the contents of `C:\Users\Documents` and upload all of the files" or "spawn cmd.exe on the user's machine". How would you even do these things if you could run any JavaScript in the browser? You can't. However, chrome.exe itself does because it's a native application, as is the sandboxed JavaScript…

Okay, but we're still talking about running machine code inside the sandbox , where that functionality is still not available.

The functionality is restricted, but the capability of expressing the intent at all exists.

Re: Actively exploited sandbox RCE in all Chromium versions

#419
post #68

Earlier quoted context omitted.

this is why again, researchers should just honestly sell these to vuln brokers instead of donating them to trillion dollar companies for nothing. nothing will change until big tech can no longer rip off security researchers

Who is to say they didn’t already do that?

you're not allowed to burn exploits like that if you've signed a deal, and who would risk that for $1k?

of course it could be a colleague or someone with access to such tools

Re: Actively exploited sandbox RCE in all Chromium versions

#420
post #408

Google has the means and ability to rewrite Chromium ; bug for bug in Rust from C++ using Astra & Fable. Same for the Linux kernel. Considering the Fermat's Last Theorem lean proof was 13MLoC and cost $300,000 it would cost $2M to rewrite Chromium & Linux in Rust going purely of combined LoC.

Writing Chromium entirely in Rust wouldn't prevent a JIT bug like this.

ok for this CVE exactly it wouldn't have worked but the general pareto 80-20 rule stands regarding the rest of the memory safety vulns
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