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points by gregschlom 2 days ago | 0 comments

"An unauthenticated attacker could exploit this vulnerability by sending a specially crafted packet to an affected service over the network. Successful exploitation could allow the attacker to execute code on the target system. No authentication or user interaction is required.."

Still, the question remains... How?

[–] IanCal 2 days ago

It mentions that it may rely on other services or security measures running- I wonder if there’s something like this hitting a firewall or av and then that calling out to paint to check file type or size out something like that?

[–] zmmmmm 2 days ago

It still makes it sound like the problem really is the other service that is letting a remote connection invoke some part of MS paint.

[–] jdiff 2 days ago

But why MS Paint? What functionality does it offer to another program to get called on specifically? And if this other service isn't calling on it specifically, what else can it be tricked into calling? And how many of those are also vulnerable to being stabbed in the back? The smaller interior holes are a problem, sure, but it seems like the CVE should be for the hull hole in that case.

[–] nonethewiser 2 days ago

Sounds like they just mean opening a file that you got from somewhere else.

>The CVSS score of 8.1 marks this as a high‑severity RCE. The EPSS score is not available, and the vulnerability is not listed in CISA’s KEV catalog. Based on the description, the likely attack vector is remote: an attacker can deliver the malicious file over a network connection, for example via Remote Desktop, file shares, or other network‑exposed services that allow users to open images. The lack of EPSS data does not diminish the threat posed by a known RCE, but it does make precise likelihood estimation difficult.

https://app.opencve.io/cve/CVE-2026-83844

[–] advisedwang 2 days ago

That's... that's not RCE though.

[–] decidu0us9034 1 day ago

Yes, it is.

[–] autoexec 2 days ago

Sounds like it might be automatically opening a file that was sent over the network without any user interaction.

[–] eqvinox 2 days ago

Reading tea leaves is still reading tea leaves, even if you make an AI do it… (which is what this is, judging by other things I've seen on opencve.io)

[–] jdiff 2 days ago

Yeah, OpenCVE also includes this:

> After applying the update, verify that the target Windows systems are running a version that includes the CVE fix before disabling legacy file‑open processing in Paint.

Which is complete nonsense. "Legacy file-open processing" isn't a real configurable option in Paint and this seems to suggest that enabling it is some sort of mitigation. The resolution is simply to update Paint.

[–] Den_VR 2 days ago

The direct implication is that current generations of ms paint are a “service over the network.” Probably a theoretically possible RPC end point of svchost.exe