Out-of-bounds Read in Miniupnp Project Miniupnpd
CVE-2026-5720
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 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.
EPSS exploit prediction
EPSS: 0.011 (63.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 63.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.011 · change: +0.004
Affected products
- Miniupnp Project Miniupnpd — versions 0
- Miniupnp Project Miniupnpd
Weakness classification (CWE)
References
- github.com/miniupnp/miniupnp/ (Product, product)
- github.com/miniupnp/miniupnp/commit/b5e5d2eb069822b7f00d56c8e61033b9d500e60c
- www.vulncheck.com/advisories/miniupnpd-integer-underflow-soapaction-header-pars… (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/miniupnp/miniupnp/commit/f56bd09b2f2650126b832c5f30a65a09e28167fa (Patch, patch)
Frequently asked questions
- What is CVE-2026-5720?
- CVE-2026-5720 is a critical-severity vulnerability in Miniupnp Project Miniupnpd, classified under Out-of-bounds Read. CVSS score: 9.1/10. Published 2026-04-17.
- How severe is CVE-2026-5720?
- Critical severity. CVSS v3 base score is 9.1 out of 10.