CVE-2026-5720
Publication date 17 April 2026
Last updated 7 September 2026
Ubuntu priority
Description
miniupnpd contains an integer underflow vulnerability in SOAPAction header parsing that allows remote attackers to cause a denial of service or information disclosure by sending a malformed SOAPAction header with a single quote. Attackers can trigger an out-of-bounds memory read by exploiting improper length validation in ParseHttpHeaders(), where the parsed length underflows to a large unsigned value when passed to memchr(), causing the process to scan memory far beyond the allocated HTTP request buffer.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| miniupnpd | 26.04 LTS resolute |
Fixed 2.3.9-2ubuntu0.1~esm1
|
| 24.04 LTS noble |
Fixed 2.3.4-1ubuntu0.1~esm1
|
|
| 22.04 LTS jammy |
Fixed 2.2.3-1ubuntu0.1~esm1
|
|
| 20.04 LTS focal |
Fixed 2.1-6.1ubuntu0.1~esm1
|
|
| 18.04 LTS bionic |
Fixed 2.0.20171212-2ubuntu0.1~esm1
|
|
| 16.04 LTS xenial |
Fixed 1.8.20140523-4.1+deb9u2ubuntu0.1~esm1
|
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CVSS version:
Base score
7.1 · High
Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
Base score
9.1 · Critical
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8731-1
- MiniUPnPd vulnerability
- 7 September 2026