Bug#1143155: gdk-pixbuf: CVE-2026-16768: out-of-bounds read when loading malicious .ico palette

[Salvatore Bonaccorso]

Hi Simon,

On Sun, Sep 13, 2026 at 01:54:49PM +0100, Simon McVittie wrote:
> Control: retitle -1 gdk-pixbuf: CVE-2026-16768: out-of-bounds read when loading malicious .ico palette
> Control: forwarded -1 https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/merge_requests/279
> 
> On Fri, 31 Jul 2026 at 07:19:27 +0200, Salvatore Bonaccorso wrote:
> > | When parsing a specially crafted ICO
> > | file with pixel values that exceed the defined palette range, an
> > | out-of-bounds read can occur due to improper bounds checking against
> > | the actual palette size.
> 
> In testing/unstable, I believe this only affects -ports architectures:
> gdk-pixbuf >= 2.44.5+dfsg-3 loads most image formats using glycin rather than
> its own C code. (Exceptions: .xpm, .xbm still use C code because the
> equivalent Rust code in glycin was not feature-complete until recently.)
> 
> -ports architectures still use the C code and are still vulnerable (glycin
> FTBFS on ppc64, and its build-deps are unavailable on the other -ports
> architectures).
> 
> trixie still uses the C code and so is still vulnerable. A fix was proposed
> upstream in <https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/merge_requests/279>
> but has not yet been reviewed/merged.

Thanks for the update. So at least at source-level it would still be
affected, will keep the tracking as it is for now (unless someone
objects). We have for now no clean way to state it becomes a
'nonissue' with only one suite. I have added though a note to clarify
the status.

Regards,
Salvatore