[FD] null pointer deference in tex-live

[Meng Ruijie <ruijie_meng@xxxxxxxxx>]

[Vulnerability description]
A null pointer deference existed in tex-live v.944e257 via a crafted file to 
the texk/web2c/pdftexdir/tounicode.c function.

[VulnerabilityType Other]
null pointer deference

[Vendor of Product]
tex-live

[Affected Product Code Base]
tex-live - 944e257

[Reference]
https://tug.org/pipermail/tex-live/2023-August/049406.html

[CVE Reference]
The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned 
the name CVE-2023-46051 to this vulnerability.
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