Read the docs
TI-2026-25674 Aliases CVE-2026-33257GHSA-p687-4q66-wh3p

Insufficient input validation of internal webserver

Priority LOW 39CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-770.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00514 44th percentileScored 2026-11-07
Fix Fixed Authoritative (PowerDNS): 5.0.4, 4.9.14DNSdist (PowerDNS): 1.9.13, 2.0.4+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
PowerDNSAuthoritative5.0.0 to before 5.0.4; 4.9.0 to before 4.9.145.0.4, 4.9.14Patch availableCNA
PowerDNSDNSdist1.9.0 to before 1.9.13; 2.0.0 to before 2.0.41.9.13, 2.0.4Patch availableCNA
PowerDNSRecursor5.4.0 to before 5.4.1; 5.3.0 to before 5.3.6; 5.2.0 to before 5.2.95.4.1, 5.3.6, 5.2.9Patch availableCNA
  • Authoritative VendorPowerDNS Affected 5.0.0 to before 5.0.4; 4.9.0 to before 4.9.14 Fixed in 5.0.4, 4.9.14 Patch available CNA
  • DNSdist VendorPowerDNS Affected 1.9.0 to before 1.9.13; 2.0.0 to before 2.0.4 Fixed in 1.9.13, 2.0.4 Patch available CNA
  • Recursor VendorPowerDNS Affected 5.4.0 to before 5.4.1; 5.3.0 to before 5.3.6; 5.2.0 to before 5.2.9 Fixed in 5.4.1, 5.3.6, 5.2.9 Patch available CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:powerdns:authoritative:*:*:*:*:*:*:*:*4.9.0 to before 4.9.14; 5.0.0 to before 5.0.4VulnerablePowerDNS
cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*1.9.0 to before 1.9.13; 2.0.0 to before 2.0.4VulnerablePowerDNS
cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*5.2.0 to before 5.2.9; 5.3.0 to before 5.3.6VulnerablePowerDNS
cpe:2.3:a:powerdns:recursor:5.4.0:*:*:*:*:*:*:*5.4.0VulnerablePowerDNS
  • cpe:2.3:a:powerdns:authoritative:*:*:*:*:*:*:*:* Versions 4.9.0 to before 4.9.14; 5.0.0 to before 5.0.4 Vulnerable ·PowerDNS
  • cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:* Versions 1.9.0 to before 1.9.13; 2.0.0 to before 2.0.4 Vulnerable ·PowerDNS
  • cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:* Versions 5.2.0 to before 5.2.9; 5.3.0 to before 5.3.6 Vulnerable ·PowerDNS
  • cpe:2.3:a:powerdns:recursor:5.4.0:*:*:*:*:*:*:* Versions 5.4.0 Vulnerable ·PowerDNS

Remediation

  • Fix · CNA Authoritative (PowerDNS) Fixed in 5.0.4, 4.9.14
  • Fix · CNA DNSdist (PowerDNS) Fixed in 1.9.13, 2.0.4
  • Fix · CNA Recursor (PowerDNS) Fixed in 5.4.1, 5.3.6, 5.2.9

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    PowerDNS DNSdist 1.9.13, 2.0.4

    11 records Highest priority Priority MEDIUM 1 MEDIUM, 10 LOW

    Other records, highest priority first

    • TI-2026-25980 Out-of-bounds read in cache inspection via LuaPriority MEDIUM 41
    • TI-2026-25977 DoQ/DoH3 excessive memory allocationPriority LOW 39
    • TI-2026-25976 Outgoing DoH excessive memory allocationPriority LOW 39
    Show all 11 records →
  • Release ·

    PowerDNS Recursor 5.2.9, 5.3.6, 5.4.1

    9 records Highest priority Priority MEDIUM 2 MEDIUM, 7 LOW

    Other records, highest priority first

    • TI-2026-25675 Crafted zones can cause increased resource usagePriority MEDIUM 40
    • TI-2026-25673 Unbounded memory allocation by internal web serverPriority MEDIUM 40
    • TI-2026-25677 Insufficient input validation of internal webserverPriority LOW 39
    Show all 9 records →
Show 1 more group
  • Release ·

    PowerDNS Authoritative 4.9.14, 5.0.4

    6 records Highest priority Priority MEDIUM 1 MEDIUM, 5 LOW

    Other records, highest priority first

    • TI-2026-25990 Incomplete domain name sanitization duringPriority MEDIUM 48
    • TI-2026-25677 Insufficient input validation of internal webserverPriority LOW 39
    • TI-2026-25992 Possible file descriptor exhaustion in forward-dnsupdatePriority LOW 33
    Show all 6 records →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33257
  2. 2026-10-03 Alias added: GHSA-p687-4q66-wh3p
  3. 2026-10-25 EPSS moved to the below the 50th percentile
  4. 2026-10-25 Priority changed: MEDIUM → LOW

References

Advisory 3

  • TI-2015-01678 The label decompression functionality in PowerDNS Recursor 3.5.x, 3.6.x before 3.6.3, and… CVSS 2.0HIGH 7.8
  • TI-2016-04703 PowerDNS (aka pdns) Authoritative Server before 3.4.10 does not properly handle a . CVSS 3.0HIGH 7.5
  • TI-2015-04466 PowerDNS (aka pdns) Authoritative Server 3.4.4 before 3.4.7 allows remote attackers to… CVSS 2.0MEDIUM 5.0
  • TI-2016-04702 PowerDNS (aka pdns) Authoritative Server before 3.4.10 allows remote attackers to cause a… CVSS 3.0HIGH 7.5
  • TI-2026-25990 Incomplete domain name sanitization during CVSS 3.1CRITICAL 9.8
  • TI-2020-15157 An issue was discovered in PowerDNS Authoritative through 4.3.0 when… CVSS 3.1CRITICAL 9.8
See all 30 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences