CVE-2026-33256— Unbounded memory allocation by internal web server
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I. Basic Information for CVE-2026-33256
Vulnerability Information
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Vulnerability Title
Unbounded memory allocation by internal web server
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
PowerDNS Recursor（pdns_recursor） 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PowerDNS Recursor（pdns_recursor）是荷兰PowerDNS公司的一款域名解析服务器。 PowerDNS Recursor（pdns_recursor）存在安全漏洞，该漏洞源于攻击者可发送Web请求，导致内部Web服务器无限内存分配，可能造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-33256
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · PowerDNS · 2026-04-22 · 22 CVEs total
| CVE-2026-33593 | 7.5 HIGH | Denial of service via crafted DNSCrypt query |
| CVE-2026-33608 | 7.4 HIGH | Incomplete domain name sanitization during |
| CVE-2026-33602 | 6.5 MEDIUM | Off-by-one access when processing crafted UDP responses |
| CVE-2026-33611 | 6.5 MEDIUM | Insufficient validation of HTTPS and SVCB records |
| CVE-2026-33261 | 5.9 MEDIUM | Null pointer accces in aggressive NSEC(3) cache |
| CVE-2026-33262 | 5.9 MEDIUM | Insufficient validation of cookie reply |
| CVE-2026-33610 | 5.9 MEDIUM | Possible file descriptor exhaustion in forward-dnsupdate |
| CVE-2026-33260 | 5.3 MEDIUM | Insufficient input validation of internal webserver |
| CVE-2026-33609 | 5.3 MEDIUM | LDAP DN injection |
| CVE-2026-33254 | 5.3 MEDIUM | Resource exhaustion via DoQ/DoH3 connections |
| CVE-2026-33595 | 5.3 MEDIUM | DoQ/DoH3 excessive memory allocation |
| CVE-2026-33594 | 5.3 MEDIUM | Outgoing DoH excessive memory allocation |
| CVE-2026-33257 | 5.3 MEDIUM | Insufficient input validation of internal webserver |
| CVE-2026-33258 | 5.3 MEDIUM | Crafted zones can cause increased resource usage |
| CVE-2026-33259 | 5.0 MEDIUM | Concurrent modification of RPZ data can lead to denial of servce |
| CVE-2026-33598 | 4.8 MEDIUM | Out-of-bounds read in cache inspection via Lua |
| CVE-2026-33601 | 4.4 MEDIUM | Insufficient validation of zonemd record |
| CVE-2026-33600 | 4.4 MEDIUM | Null pointer dereference in RPZ transfer |
| CVE-2026-33597 | 3.7 LOW | PRSD detection denial of service |
| CVE-2026-33596 | 3.1 LOW | TCP backend stream ID overflow |
Showing top 20 of 22 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Recursor
- CVE-2026-33262
Insufficient validation of cookie reply - CVE-2026-33261
Null pointer accces in aggressive NSEC(3) cache - CVE-2026-33259
Concurrent modification of RPZ data can lead to denial of se - CVE-2026-33258
Crafted zones can cause increased resource usage - CVE-2026-33601
Insufficient validation of zonemd record
V. Comments for CVE-2026-33256
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