{"id":"CVE-2026-5720","summary":"miniupnpd Integer Underflow SOAPAction Header Parsing","details":"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.","modified":"2026-08-12T16:41:31.808992Z","published":"2026-04-17T21:39:54.818Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-125","CWE-191"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5720.json"},"references":[{"type":"WEB","url":"https://github.com/miniupnp/miniupnp/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5720.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-5720"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/miniupnpd-integer-underflow-soapaction-header-parsing"},{"type":"FIX","url":"https://github.com/miniupnp/miniupnp/commit/f56bd09b2f2650126b832c5f30a65a09e28167fa"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/miniupnp/miniupnp","events":[{"introduced":"0"},{"fixed":"b5e5d2eb069822b7f00d56c8e61033b9d500e60c"},{"fixed":"f56bd09b2f2650126b832c5f30a65a09e28167fa"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.3.10"}],"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:miniupnp_project:miniupnpd:*:*:*:*:*:*:*:*"}}],"versions":["miniupnpc_2_3_3","miniupnpd_2_3_9","miniupnpd_2_3_8","miniupnpc_2_3_2","miniupnpc_2_3_1","miniupnpc_2_3_0","miniupnpd_2_3_7","miniupnpc_2_2_8_test2","miniupnpc_2_2_8_test","miniupnpc_2_2_8","miniupnpd_2_3_6","miniupnpc_2_2_7","miniupnpd_2_3_5","miniupnpd_2_3_4","miniupnpc_2_2_6","miniupnpc_2_2_5","miniupnpd_2_3_3","miniupnpd_2_3_2","minissdpd_1_6_0","miniupnpc_2_2_4","miniupnpd_2_3_1","miniupnpd_2_3_0","miniupnpc_2_2_3","miniupnpd_2_2_3","miniupnpd_2_2_2","miniupnpc_2_2_2","miniupnpd_2_2_1","miniupnpc_2_2_1","miniupnpc_2_2_0","miniupnpd_2_2_0","miniupnpd_2_1","miniupnpc_2_1","minissdpd_1_4","miniupnpc_1_9","miniupnpd_1_8","miniupnpc_1_8","miniupnpd_1_7","minissdpd_1_2","miniupnpc_1_7"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5720.json","vanir_signatures_modified":"2026-08-12T16:41:31Z","vanir_signatures":[{"id":"CVE-2026-5720-78173e0c","signature_type":"Function","signature_version":"v1","source":"https://github.com/miniupnp/miniupnp/commit/f56bd09b2f2650126b832c5f30a65a09e28167fa","target":{"function":"ParseHttpHeaders","file":"miniupnpd/upnphttp.c"},"deprecated":false,"digest":{"function_hash":"137835554319908672513060423669875536045","length":3739}},{"digest":{"line_hashes":["45283987207158182963117741176375037749","180580750037951827598248409871921406777","158128436897221582977905386953412345060","193993139606528909609573258168442797661","101451958385939609231602228531813564397","221106545120607036307828017346654385540"],"threshold":0.9},"id":"CVE-2026-5720-d5b78c08","signature_type":"Line","signature_version":"v1","source":"https://github.com/miniupnp/miniupnp/commit/f56bd09b2f2650126b832c5f30a65a09e28167fa","target":{"file":"miniupnpd/upnphttp.c"},"deprecated":false}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}