SECURITY UPDATE: mod_xml2enc heap-based buffer overflow via xml2StartParse
with untrusted content
debian/patches/CVE-2026-42536.patch: add the missing
ctx->bblen -= (p-ctx->buf) accounting in fix_skipto() in
modules/filters/mod_xml2enc.c so the bblen byte-length counter stays in
sync with bytes when leading content is skipped, preventing a heap
buffer overflow. Upstream fix
cb1f79c0ce66393c48657b19df754f16b79af543 (SVN r1934971).