CVE-2026-33257 | Insufficient input validation of internal webserver

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.

Published: 2026-04-22 Last update: 2026-04-27 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-33257 is rated Low Risk (21.8/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.01%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-33257

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-22 — 0.01% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-33257

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.9 1.4 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2026-33257

GitHub Security Advisory for CVE-2026-33257

GHSA-p687-4q66-wh3p · Severity: medium — An attacker can send a web request that causes unlimited memory allocation in the internal web...

OS Trackers for CVE-2026-33257

vendor priority summary link
debian end-of-life CVE-2026-33257 end-of-life priority: Debian including 3 source packages (dnsdist, pdns, pdns-recursor), 15 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 9, open 6. https://security-tracker.debian.org/tracker/CVE-2026-33257
suse medium — https://www.suse.com/security/cve/CVE-2026-33257/
ubuntu medium CVE-2026-33257 medium priority: Ubuntu including 3 source packages (dnsdist, pdns, pdns-recursor), 24 status rows across 8 suites (bionic, focal, jammy, noble, questing, resolute, upstream, xenial): needs-triage 21, released 2, not-affected 1. https://ubuntu.com/security/CVE-2026-33257

Affected software / configurations for CVE-2026-33257

Vendor Product Version Raw CPE
powerdns authoritative >= 4.9.0, < 4.9.14 cpe:2.3:a:powerdns:authoritative:*:*:*:*:*:*:*:*
powerdns authoritative >= 5.0.0, < 5.0.4 cpe:2.3:a:powerdns:authoritative:*:*:*:*:*:*:*:*
powerdns dnsdist >= 1.9.0, < 1.9.13 cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*
powerdns dnsdist >= 2.0.0, < 2.0.4 cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*
powerdns recursor >= 5.2.0, < 5.2.9 cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*
powerdns recursor >= 5.3.0, < 5.3.6 cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*
powerdns recursor 5.4.0 cpe:2.3:a:powerdns:recursor:5.4.0:*:*:*:*:*:*:*

References for CVE-2026-33257

cvelogic Threat Intelligence