CVE-2026-27854— Use after free when parsing EDNS options in Lua
Get alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-27854
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗ Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Use after free when parsing EDNS options in Lua
Source: NVD (National Vulnerability Database)
Vulnerability Description
An attacker might be able to trigger a use-after-free by sending crafted DNS queries to a DNSdist using the DNSQuestion:getEDNSOptions method in custom Lua code. In some cases DNSQuestion:getEDNSOptions might refer to a version of the DNS packet that has been modified, thus triggering a use-after-free and potentially a crash resulting in denial of service.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
PowerDNS DNSdist 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PowerDNS DNSdist是PowerDNS公司的一个提供DNS流量负载均衡与安全防护能力的代理软件。 PowerDNS DNSdist存在安全漏洞，该漏洞源于使用DNSQuestion:getEDNSOptions方法时存在释放后重用，可能导致崩溃和拒绝服务。
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-2026-27854
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-27854
请登录查看更多情报信息。
Same Patch Batch · PowerDNS · 2026-03-31 · 7 CVEs total
| CVE-2026-24029 | 6.5 MEDIUM | DNS over HTTPS ACL bypass |
| CVE-2026-27853 | 5.9 MEDIUM | Out-of-bounds write when rewriting large DNS packets |
| CVE-2026-24030 | 5.3 MEDIUM | Unbounded memory allocation for DoQ and DoH3 |
| CVE-2026-24028 | 5.3 MEDIUM | Out-of-bounds read when parsing DNS packets via Lua |
| CVE-2026-0397 | 3.1 LOW | Information disclosure via CORS misconfiguration |
| CVE-2026-0396 | 3.1 LOW | HTML injection in the web dashboard |
IV. Related Vulnerabilities
V. Comments for CVE-2026-27854
No comments yet