The CopyFail announcement and handling is one of the least defender-supporting I think I've ever seen.
Mitigations were extremely thin at launch, and haven't improved much, and are even brittle and misleading:
https://infosec.exchange/@tychotithonus/116490466168316767
They've also largely neglected most of the value of the feedback they're getting from defenders clamoring for useful intel. The GitHub repo is full of feedback about which distros are affected or unaffected ... and a day later, none of it has been used to update the list of affected versions in the main README (except for the RHEL made-up version fix)
And this exchange is painful:
https://github.com/theori-io/copy-fail-CVE-2026-31431/issues/12
"None of us are RH people so it wasn't caught" 😐 You had weeks do basic vetting, or find someone who would help you.
Theori seems to have to have intended this to be a showcase for their product. Instead, it has convinced me that I will never buy anything from them.
Edit: Will Dorman goes into more detail here, 100% agreed:
https://infosec.exchange/@wdormann/116493725294723695
#CopyFail #cve_2026_31431