I just had the same result, but this worked for me:

sudo dnf download noopenh264.x86_64
sudo dnf install noopenh264-2.5.0-2.fc42.x86_64.rpm --allowerasing

Trying to install from the repo without downloading gave similar
results to sudo dnf swap.

On Thu, May 29, 2025 at 5:55 AM Jonathan Schleifer <js-fed...@nil.im> wrote:
>
> Thanks for bringing this to my attention - I had no idea Fedora would
> let something so serious be unfixed for so long, as I kinda assumed
> Fedora is on top of security updates. Time to immediately delete
> openh264 indeed! However:
>
> Am 29.04.25 um 19:21 schrieb Leigh Scott:
>
> > sudo dnf swap *\openh264\* noopenh264 --allowerasing
>
> Unfortunately that does not seem to work on f42:
>
> $ sudo dnf swap \*openh264\* noopenh264 --allowerasing
> Updating and loading repositories:
> Repositories loaded.
> Problem: cannot install the best candidate for the job
>    - conflicting requests
>
> Package                 Arch   Version                 Repository
>     Size
> Reinstalling:
>   openh264               x86_64 2.4.1-2.fc42            fedora-cisco-op
>   1.1 MiB
>     replacing openh264   x86_64 2.4.1-2.fc42            fedora-cisco-op
>   1.1 MiB
>
> Transaction Summary:
>   Reinstalling:       1 package
>   Replacing:          1 package
>
> Total size of inbound packages is 419 KiB. Need to download 419 KiB.
> After this operation, 0 B extra will be used (install 1 MiB, remove 1 MiB).
> Is this ok [y/N]:
>
> Any other way to close this wide open security hole?
>
> --
> Jonathan
> --
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-- 
Jason Montleon        | email: jmont...@redhat.com
Red Hat, Inc.         | gpg key: 0x069E3022
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