CVE-2026-72712
Nmap 7.99 Denial of Service via Zero-Length TCP Option Packet
- State
- Published
- Severity
- 6.9 Medium
- Published
- Aug 11, 2026
- Updated
- Aug 14, 2026
- Reserved
- Aug 10, 2026
Description
Nmap versions up to and including 7.99 contains a denial of service vulnerability that allows remote attackers to crash the application by sending a crafted packet containing a zero-length TCP option. The malformed packet forces the Packet:parse_options() function in nselib/packet.lua to allocate objects in an infinite loop, causing an out-of-memory condition that results in application crash.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')
Affected Products
| Product | Versions |
|---|---|
NmapNmap Project |
|
References
- Product Repositoryproduct
- GitHub Issueissue-tracking
- Patch Commitpatch
- https://www.vulncheck.com/advisories/nmap-denial-of-service-via-zero-length-tcp-option-packetthird-party-advisory
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