Stefan Esser pointed out that the following commit fixes a heap-based buffer overflow in DNS TXT record parsing: https://github.com/php/php-src/commit/b34d7849ed90ced9345f8ea1c59bc8d101c18468 A malicious server or man-in-the-middle attacker could possibly use this flaw to execute arbitrary code as the PHP interpreter if a PHP application uses dns_get_record() to perform a DNS query. Can a CVE please be assigned if one has not been already? (Red Hat bug with no further details: https://bugzilla.redhat.com/show_bug.cgi?id=1108447) ext/standard/dns.c @@ -517,6 +517,10 @@ static u_char *php_parserr(u_char *cp, querybuf *answer, int type_to_fetch, int while (ll < dlen) { n = cp[ll]; + if ((ll + n) >= dlen) { + // Invalid chunk length, truncate + n = dlen - (ll + 1); + } memcpy(tp + ll , cp + ll + 1, n); add_next_index_stringl(entries, cp + ll + 1, n, 1); ll = ll + n + 1;