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Medium RLSA-2021:1853 11 CVEs

Moderate: unbound security, bug fix, and enhancement update

Published May 18, 2021 · Updated Feb 5, 2026

Ecosystem: Rocky Linux

Summary

The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver.

Security Fix(es):

* unbound: integer overflow in the regional allocator via regional_alloc (CVE-2019-25032)

* unbound: integer overflow in sldns_str2wire_dname_buf_origin can lead to an out-of-bounds write (CVE-2019-25034)

* unbound: out-of-bounds write in sldns_bget_token_par (CVE-2019-25035)

* unbound: assertion failure and denial of service in synth_cname (CVE-2019-25036)

* unbound: assertion failure and denial of service in dname_pkt_copy via an invalid packet (CVE-2019-25037)

* unbound: integer overflow in a size calculation in dnscrypt/dnscrypt.c (CVE-2019-25038)

* unbound: integer overflow in a size calculation in respip/respip.c (CVE-2019-25039)

* unbound: infinite loop via a compressed name in dname_pkt_copy (CVE-2019-25040)

* unbound: assertion failure via a compressed name in dname_pkt_copy (CVE-2019-25041)

* unbound: out-of-bounds write via a compressed name in rdata_copy (CVE-2019-25042)

* unbound: symbolic link traversal when writing PID file (CVE-2020-28935)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Rocky Linux 8.4 Release Notes linked from the References section.

Fixed packages 1

ReleasePackageFixed in
Rocky Linux · 8 unbound 0:1.7.3-15.el8

Vulnerabilities 11

References

  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1714175
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1842837
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1850460
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1878761
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1954772
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1954778
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1954780
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1954782
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1954794
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1954796
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1954797
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1954799
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1954801
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1954804