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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Nmap Project | Nmap | ≤ 7.99 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | nmap | 7.991+dfsg-1 | — |
| Debian 13 | nmap | No fix yet | — |
| Debian 12 | nmap | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | nmap | No fix yet | — |
| Ubuntu 26.04 LTS | nmap | No fix yet | — |
| Ubuntu 24.04 LTS | nmap | No fix yet | — |
| Ubuntu 22.04 LTS | nmap | No fix yet | — |
| Ubuntu 20.04 LTS | nmap | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | nmap | No fix yet | — |
| Ubuntu 16.04 LTS | nmap | No fix yet | — |
| Ubuntu 14.04 LTS | nmap | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | nmap | 7.92-160000.4.1 | SUSE-SU-2026:24602-1 |
| SLES 16.0 | nmap | 7.92-160000.4.1 | SUSE-SU-2026:24602-1 |
| SLE Micro 6.2 | libsoup | 3.6.6-160000.5.1 | SUSE-SU-2026:24515-1 |
| SLE Micro 6.2 | nmap | 7.92-160000.4.1 | SUSE-SU-2026:24515-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | nmap | 7.95-5 | — |
Advisories 3
- SUSE-SU-2026:24602-1 Security update for nmap SUSE / openSUSE Security Updates · Nov 10, 2026
- WID-SEC-2026-2787 nmap: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Nov 8, 2026
- SUSE-SU-2026:24515-1 Security update for nmap SUSE / openSUSE Security Updates · Nov 5, 2026
References
- Product Repository product
- GitHub Issue issue-tracking
- Patch Commit patch
- https://www.vulncheck.com/advisories/nmap-denial-of-service-via-zero-length-tcp-option-packet third-party-advisory