CVE-2026-5720
criticalpriority · track · 36EPSS 0.007 · 52 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 5–9.1
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (2)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (8)
External citations — patches, advisories, analysis.
- https://github.com/miniupnp/miniupnp/releasesPatchcnnvd
- https://nvd.nist.gov/vuln/detail/CVE-2026-5720cnnvd
- https://github.com/miniupnp/miniupnp/enisa_euvd
- https://github.com/miniupnp/miniupnp/commit/f56bd09b2f2650126b832c5f30a65a09e28167faenisa_euvd
- https://www.vulncheck.com/advisories/miniupnpd-integer-underflow-soapaction-header-parsingenisa_euvd
- https://github.com/miniupnp/miniupnp/Productnvd
- https://github.com/miniupnp/miniupnp/commit/f56bd09b2f2650126b832c5f30a65a09e28167faPatchnvd
- https://www.vulncheck.com/advisories/miniupnpd-integer-underflow-soapaction-header-parsingThird Party AdvisoryVDB Entrynvd
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