CVE-2026-41292— Long list of incoming EDNS options degrades performance
Possible ATT&CK Techniques 2AI
T1499 · Endpoint Denial of Service T1499.002 · Service Exhaustion FloodAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| NLnet Labs | Unbound | < 1.25.1 | affected |
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I. Basic Information for CVE-2026-41292
Vulnerability Information
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Vulnerability Title
Long list of incoming EDNS options degrades performance
Source: NVD (National Vulnerability Database)
Vulnerability Description
NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to a degradation of service attack related to parsing long lists of incoming EDNS options. An adversary sending queries with too many EDNS options can hold Unbound threads hostage while they are parsing and creating internal data structures for the options. Coordinated attacks can result in degradation and/or denial of service. Unbound 1.25.1 contains a patch with a fix to limit acceptable incoming EDNS options (100).
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
算法复杂性
Source: NVD (National Vulnerability Database)
Vulnerability Title
NLnet Labs Unbound 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NLnet Labs Unbound是NLnet Labs开源的一个高性能DNS解析器。 NLnet Labs Unbound 1.25.0及之前版本存在安全漏洞，该漏洞源于解析大量传入EDNS选项时可能导致服务降级，攻击者发送过多EDNS选项的查询可占用Unbound线程，协调攻击可能导致降级或拒绝服务。
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
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| NLnet Labs | Unbound | 0 ~ 1.25.1 | - |
II. Public POCs for CVE-2026-41292
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-41292 (1)
Same Patch Batch · NLnet Labs · 2026-05-20 · 11 CVEs total
| CVE-2026-42959 | Crash during DNSSEC validation of malicious content | |
| CVE-2026-42923 | Degradation of service with unbounded NSEC3 hash calculations | |
| CVE-2026-42944 | Heap overflow with multiple NSID, COOKIE, PADDING EDNS options | |
| CVE-2026-42960 | Possible cache poisoning via promiscuous records for the authority section | |
| CVE-2026-42534 | Jostle logic bypass degrades resolution performance | |
| CVE-2026-32792 | Packet of death with DNSCrypt | |
| CVE-2026-40622 | Another 'ghost domain names' attack variant | |
| CVE-2026-44390 | Unbounded name compression in certain cases causes degradation of service | |
| CVE-2026-44608 | Use after free and crash under special conditions in RPZ code | |
| CVE-2026-33278 | Possible arbitrary code execution during DNSSEC validation |
IV. Related Vulnerabilities
Same product: Unbound
- CVE-2026-44608
Use after free and crash under special conditions in RPZ cod - CVE-2026-44390
Unbounded name compression in certain cases causes degradati - CVE-2026-42960
Possible cache poisoning via promiscuous records for the aut - CVE-2026-42959
Crash during DNSSEC validation of malicious content - CVE-2026-42944
Heap overflow with multiple NSID, COOKIE, PADDING EDNS optio
Same vendor: NLnet Labs
- CVE-2026-44608
Use after free and crash under special conditions in RPZ cod - CVE-2026-44390
Unbounded name compression in certain cases causes degradati - CVE-2026-42960
Possible cache poisoning via promiscuous records for the aut - CVE-2026-42959
Crash during DNSSEC validation of malicious content - CVE-2026-42944
Heap overflow with multiple NSID, COOKIE, PADDING EDNS optio
Same weakness: CWE-407
- CVE-2026-44390
Unbounded name compression in certain cases causes degradati - CVE-2026-42923
Degradation of service with unbounded NSEC3 hash calculation - CVE-2026-45186
libexpat 安全漏洞 - CVE-2026-42245
net-imap: Quadratic complexity when reading response literal - CVE-2026-43967
Quadratic fragment-name uniqueness check causes denial of se
V. Comments for CVE-2026-41292
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