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CVE-2026-42005

Insufficient input validation of internal web server

4.3 MediumFix available

CVE-2026-42005 is a medium vulnerability (CVSS 4.3) in Powerdns Authoritative, published June 25, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.62%, the 50th percentile. Fixed in pdns-recursor 5.4.3-r0.

An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
Low

Exploit likelihood

0.62%Up 0.1 points since Jun 26, 2026
90%50%10%1%

What each source reports

CVE List Score used 4.3

Insufficient input validation of internal web server

An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default.

Record
CVE-2026-42005
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-400
Updated
2026-11-02
EUVDEUVD-2026-39345 4.3

An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default.

Record
EUVD-2026-39345
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-27xg-fw4v-jgv6 4.3

An attacker can send a web request that causes unlimited memory allocation in the internal web...

An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default.

Record
GHSA-27xg-fw4v-jgv6
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-400
Updated
2026-11-02
NVD 4.3

An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default.

Record
CVE-2026-42005
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-400
Updated
2026-11-02
OSVALPINE-CVE-2026-42005 4.3

An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default.

Record
ALPINE-CVE-2026-42005
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-03
OSV 4.3

Insufficient input validation of internal web server

An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default.

Record
CVE-2026-42005
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
Show 6 moreShow less
OSVDEBIAN-CVE-2026-42005 4.3

An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default.

Record
DEBIAN-CVE-2026-42005
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVUBUNTU-CVE-2026-42005 4.3

An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default.

Record
UBUNTU-CVE-2026-42005
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVopenSUSE-SU-2026:11411-1 No score

dnsdist-2.0.7-1.1 on GA media

These are all security issues fixed in the dnsdist-2.0.7-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:11411-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:21533-1 No score

Security update for dnsdist

This update for dnsdist fixes the following issues:

Update to 1.9.15.

Changes for dnsdist:

Security issues fixed:

  • CVE-2026-40011: invalid output produced in the prometheus endpoint when a large number of crafted DNS queries are sent (bsc#1269204).
  • CVE-2026-40208: processing of DoH3 queries can be delayed via DoH3 GET queries with an invalid DATA frames (bsc#1269207).
  • CVE-2026-40209: outgoing TCP connections to backend can get stuck until a timeout occurs when specially crafted IXFR queries are sent (bsc#1269206).
  • CVE-2026-40210: out-of-bounds read when SetMacAddrAction is used can lead to uninitialized memory being sent over the network or a crash (bsc#1269205).
  • CVE-2026-40211: crafted DNS over HTTP/3 queries can trigger an exception that prevents memory from being freed and can lead to an OOM condition (bsc#1269203).
  • CVE-2026-42004: crafted EDNS OPT record will be ignored by filtering rules, but will be rewritten as a valid OPT record when EDNS Client Subnet is inserted (bsc#1269202).
  • CVE-2026-42005: crafted web request can cause unlimited memory allocation in the internal web server and lead to a DoS (bsc#1269201).
Record
openSUSE-SU-2026:21533-1
Updated
2026-11-02
OSVSUSE-SU-2026:23123-1 No score

Security update for dnsdist

This update for dnsdist fixes the following issues:

Update to 1.9.15.

Changes for dnsdist:

Security issues fixed:

  • CVE-2026-40011: invalid output produced in the prometheus endpoint when a large number of crafted DNS queries are sent (bsc#1269204).
  • CVE-2026-40208: processing of DoH3 queries can be delayed via DoH3 GET queries with an invalid DATA frames (bsc#1269207).
  • CVE-2026-40209: outgoing TCP connections to backend can get stuck until a timeout occurs when specially crafted IXFR queries are sent (bsc#1269206).
  • CVE-2026-40210: out-of-bounds read when SetMacAddrAction is used can lead to uninitialized memory being sent over the network or a crash (bsc#1269205).
  • CVE-2026-40211: crafted DNS over HTTP/3 queries can trigger an exception that prevents memory from being freed and can lead to an OOM condition (bsc#1269203).
  • CVE-2026-42004: crafted EDNS OPT record will be ignored by filtering rules, but will be rewritten as a valid OPT record when EDNS Client Subnet is inserted (bsc#1269202).
  • CVE-2026-42005: crafted web request can cause unlimited memory allocation in the internal web server and lead to a DoS (bsc#1269201).
Record
SUSE-SU-2026:23123-1
Updated
2026-11-02
OSVSUSE-SU-2026:23146-1 No score

Security update for dnsdist

This update for dnsdist fixes the following issues:

Update to 1.9.15.

Changes for dnsdist:

Security issues fixed:

  • CVE-2026-40011: invalid output produced in the prometheus endpoint when a large number of crafted DNS queries are sent (bsc#1269204).
  • CVE-2026-40208: processing of DoH3 queries can be delayed via DoH3 GET queries with an invalid DATA frames (bsc#1269207).
  • CVE-2026-40209: outgoing TCP connections to backend can get stuck until a timeout occurs when specially crafted IXFR queries are sent (bsc#1269206).
  • CVE-2026-40210: out-of-bounds read when SetMacAddrAction is used can lead to uninitialized memory being sent over the network or a crash (bsc#1269205).
  • CVE-2026-40211: crafted DNS over HTTP/3 queries can trigger an exception that prevents memory from being freed and can lead to an OOM condition (bsc#1269203).
  • CVE-2026-42004: crafted EDNS OPT record will be ignored by filtering rules, but will be rewritten as a valid OPT record when EDNS Client Subnet is inserted (bsc#1269202).
  • CVE-2026-42005: crafted web request can cause unlimited memory allocation in the internal web server and lead to a DoS (bsc#1269201).
Record
SUSE-SU-2026:23146-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
pdns-recursor
Alpine:v3.24
 before 5.4.3-r0
5.4.3-r0
dnsdist
Debian:12
 All versions, plus listed versions
1.7.3-21.8.0-11.8.1-11.8.2-11.8.2-2
Show 33 moreShow less
1.8.2-31.8.3-11.8.3-21.8.3-31.9.10-11.9.3-11.9.4-11.9.5-11.9.6-11.9.8-11.9.9-12.0.0-12.0.0-22.0.0-32.0.0-42.0.0-52.0.0-62.0.0~rc1-12.0.0~rc1-22.0.0~rc2-12.0.1-12.0.2-12.0.3-12.0.4-12.0.5-12.0.5-22.0.5-32.0.6-12.1.0-12.1.0-22.1.1-12.1.2-12.1.3-1
 None known
dnsdist
Debian:13
 before 1.9.15-0+deb13u1, plus listed versions
1.9.10-11.9.10-1+deb13u11.9.14-0+deb13u1
1.9.15-0+deb13u1
dnsdist
Debian:14
 before 2.1.0-1, plus listed versions
1.9.10-12.0.0-12.0.0-22.0.0-32.0.0-4
Show 13 moreShow less
2.0.0-52.0.0-62.0.0~rc1-12.0.0~rc1-22.0.0~rc2-12.0.1-12.0.2-12.0.3-12.0.4-12.0.5-12.0.5-22.0.5-32.0.6-1
2.1.0-1
pdns
Debian:12
 All versions, plus listed versions
4.7.3-24.8.0-14.8.0-24.8.1-14.8.1-2
Show 37 moreShow less
4.8.2-14.8.2-24.8.3-14.8.3-24.8.3-34.8.3-44.9.0-14.9.0-24.9.1-14.9.1-24.9.1-34.9.2-14.9.2-24.9.3-14.9.3-24.9.3-34.9.4-14.9.4-24.9.7-15.0.0-15.0.0-25.0.1-15.0.2-15.0.3-15.0.4-15.0.5-15.0.5-25.0.5-35.0.5-45.1.0-15.1.1-15.1.1-25.1.1-35.1.2-15.1.3-15.1.4-15.1.5-1
 None known
pdns
Debian:13
 before 4.9.16-0+deb13u1, plus listed versions
4.9.14-0+deb13u14.9.15-0+deb13u14.9.7-1
4.9.16-0+deb13u1
pdns
Debian:14
 before 5.1.2-1, plus listed versions
4.9.7-15.0.0-15.0.0-25.0.1-15.0.2-1
Show 10 moreShow less
5.0.3-15.0.4-15.0.5-15.0.5-25.0.5-35.0.5-45.1.0-15.1.1-15.1.1-25.1.1-3
5.1.2-1
pdns-recursor
Debian:12
 All versions, plus listed versions
4.8.4-14.8.6-14.8.7-14.8.8-14.8.8-1+deb12u1
Show 45 moreShow less
4.9.0-14.9.0-24.9.1-14.9.1-24.9.1-34.9.1-44.9.2-14.9.2-24.9.3-14.9.4-14.9.5-15.0.5-15.0.7-15.0.7-25.0.9-15.1.3-15.1.3-25.2.0-15.2.0-25.2.0-35.2.0-45.2.0-55.2.1-15.2.2-15.2.2-25.2.4-15.2.4-25.2.5-15.3.0-15.3.0-25.3.0-35.3.0-45.3.0-55.3.1-15.3.3-15.3.4-15.3.4-25.3.5-15.4.0-15.4.1-15.4.1-25.4.2-15.4.2-25.4.3-15.4.4-1
 None known
pdns-recursor
Debian:13
 before 5.2.11-0+deb13u1, plus listed versions
5.2.4-25.2.4-2+deb13u15.2.5-15.2.6-0+deb13u15.2.7-0+deb13u15.2.8-0+deb13u15.2.9-0+deb13u1
5.2.11-0+deb13u1
pdns-recursor
Debian:14
 before 5.4.3-1, plus listed versions
5.2.4-25.2.5-15.3.0-15.3.0-25.3.0-3
Show 12 moreShow less
5.3.0-45.3.0-55.3.1-15.3.3-15.3.4-15.3.4-25.3.5-15.4.0-15.4.1-15.4.1-25.4.2-15.4.2-2
5.4.3-1
Show 26 moreShow less
Affected packages
PackageAffectedFixed
dnsdist
SUSE:Linux Enterprise Server 16.0
 before 1.9.15-160000.1.1
1.9.15-160000.1.1
dnsdist
SUSE:Linux Enterprise Server for SAP applications 16.0
 before 1.9.15-160000.1.1
1.9.15-160000.1.1
dnsdist
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.0.0~alpha2-1
 None known
pdns
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
3.4.5-1build23.4.6-23.4.6-33.4.7-13.4.7-2
Show 5 moreShow less
4.0.0~alpha1-14.0.0~alpha2-24.0.0~alpha2-34.0.0~alpha2-3build14.0.0~alpha2-3ubuntu0.1~esm1
 None known
pdns-recursor
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
3.7.3-14.0.0~alpha1-14.0.0~alpha1-24.0.0~alpha2-24.0.0~alpha2-2ubuntu0.14.0.0~alpha2-2ubuntu0.1+esm1
 None known
dnsdist
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
1.2.0-11.2.0-31.2.1-11.2.1-1build11.2.1-1ubuntu0.1~esm1
 None known
pdns
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
4.0.4-24.0.4-2build14.0.5-14.1.0-14.1.0-24.1.0-2build14.1.1-14.1.1-1ubuntu0.1~esm1
 None known
pdns-recursor
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
4.0.6-14.0.6-1build14.0.7-14.1.1-14.1.1-1build14.1.1-24.1.1-2ubuntu0.1~esm1
 None known
dnsdist
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
1.4.0~rc3-11.4.0-11.4.0-1build11.4.0-1build21.4.0-1ubuntu0.1~esm1
 None known
pdns
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
4.1.6-3build14.2.0-14.2.1-14.2.1-1build14.2.1-1build24.2.1-1ubuntu0.1~esm1
 None known
pdns-recursor
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
4.2.0-64.2.1-14.2.1-1build14.2.1-1build24.2.1-1ubuntu0.1~esm1
 None known
dnsdist
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
1.5.1-3build21.6.1-1build11.6.1-1ubuntu0.1~esm11.6.1-1ubuntu0.1~esm2
 None known
pdns
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
4.4.1-1build14.4.1-34.4.1-44.5.2-1build14.5.3-14.5.3-1ubuntu0.1~esm1
 None known
pdns-recursor
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
4.4.2-34.6.0-1ubuntu14.6.0-1ubuntu1+esm1
 None known
pdns
Ubuntu:24.04:LTS
 All versions, plus listed versions
4.8.1-1build14.8.3-24.8.3-2build14.8.3-34.8.3-44.8.3-4build24.8.3-4build3
 None known
pdns-recursor
Ubuntu:24.04:LTS
 All versions, plus listed versions
4.9.0-24.9.1-44.9.2-14.9.2-1build14.9.2-24.9.3-14.9.3-1build24.9.3-1build3
 None known
dnsdist
Ubuntu:Pro:24.04:LTS
 All versions, plus listed versions
1.8.0-11.8.2-11.8.2-21.8.2-31.8.3-1
Show 4 moreShow less
1.8.3-21.8.3-2build11.8.3-2build21.8.3-2ubuntu0.1~esm1
 None known
dnsdist
Ubuntu:25.10
 All versions, plus listed versions
1.9.8-11.9.10-11.9.10-1ubuntu0.1
 None known
pdns
Ubuntu:25.10
 All versions, plus listed versions
4.9.4-24.9.7-14.9.7-1build25.0.0-2
 None known
pdns-recursor
Ubuntu:25.10
 All versions, plus listed versions
5.2.0-55.2.2-15.2.2-25.2.4-25.2.4-2build2
 None known
dnsdist
Ubuntu:26.10
 All versions, plus listed versions
2.0.2-1build12.0.5-2ubuntu12.0.5-2ubuntu3
 None known
pdns
Ubuntu:26.10
 All versions, plus listed versions
5.0.2-1build15.0.5-45.1.0-15.1.1-15.1.1-2
Show 4 moreShow less
5.1.1-35.1.2-15.1.3-15.1.4-1
 None known
dnsdist
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.9.10-12.0.1-12.0.2-12.0.2-1build1
 None known
pdns
Ubuntu:26.04:LTS
 All versions, plus listed versions
5.0.0-25.0.1-15.0.2-15.0.2-1build1
 None known
dnsdist
openSUSE:Tumbleweed
 before 2.0.7-1.1
2.0.7-1.1
dnsdist
openSUSE:Leap 16.0
 before 1.9.15-160000.1.1
1.9.15-160000.1.1

History

History
WhenChangedSources
2026-11-03affected, aliases, referencesOSV
2026-11-02createdCVE List, EUVD, GitHub Advisories, NVD, OSV

References

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Left out here: 4 versions. The JSON record has them.

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