More info: this is not an upstream issue, it's caused by the handle-removed-working-dir.patch which is an attempt to fix #667038. Besides chopping off the last path component of any cd ../name command, it also does sfprintf(shp->strbuf,oldpwd) which is a problem if oldpwd contains printf formatting escapes, which probably could be exploited. Workaround is to remove handle-removed-working-dir.patch which would then reopen #667038.
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