manual/search.texi in the GNU C Library (aka glibc) before 2.2 lacks a statement about the unspecified tdelete return value upon deletion of a tree's root, which might allow attackers to access a dangling pointer in an application whose developer was unaware of a documentation update from 1999.

References

• https://nvd.nist.gov/vuln/detail/CVE-1999-0199
• bminor/glibc@2864e76#diff-94e8c502f255fdfc346df0e29fd4ef40
• https://ftp.gnu.org/gnu/glibc/glibc-2.2.tar.gz
• https://www.cee.studio/tdelete.html