{"id":"CVE-2026-9539","state":"PUBLISHED","title":"libslirp TCP URG OOB Read Information Leak","description":"An out-of-bounds heap read and integer underflow in the TCP urgent data handling (sosendoob) in freedesktop.org libslirp version before v4.9.2 on hypervisor host environments (e.g., QEMU) allows a privileged guest VM attacker (root or CAP_NET_RAW) to leak gigabytes of sensitive host-process heap memory via sending crafted TCP segments with manipulated URG flags and urgent pointers (ti_urp).","publishedAt":"2026-06-24T04:37:01.955Z","updatedAt":"2026-06-24T12:39:59.831Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","source":"STAR_Labs"},"assigner":"STAR_Labs","products":["freedesktop.org libslirp"],"affected":[{"vendor":"freedesktop.org","product":"libslirp","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"4.9.2","changes":[{"at":"4.9.2","status":"unaffected"}],"versionType":"semver"}],"repo":"https://gitlab.freedesktop.org/slirp/libslirp/"}],"references":["https://gitlab.freedesktop.org/slirp/libslirp/-/work_items/93","https://gitlab.freedesktop.org/slirp/libslirp/-/commit/927bca7344e31fd58e2f7afaca784aad4400eb84","https://gitlab.freedesktop.org/slirp/libslirp/-/releases/v4.9.2"],"weaknesses":["CWE-125"],"ingestedAt":"2026-10-29T20:13:52.441Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/9xxx/CVE-2026-9539.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-9539","state":"PUBLISHED","datePublished":"2026-06-24T04:37:01.955Z","dateUpdated":"2026-06-24T12:39:59.831Z","assignerShortName":"STAR_Labs","assignerOrgId":"b1571b85-cbc9-431f-830b-0c8155323a69","dateReserved":"2026-05-26T02:36:53.227Z"},"containers":{"cna":{"title":"libslirp TCP URG OOB Read Information Leak","descriptions":[{"lang":"en","value":"An out-of-bounds heap read and integer underflow in the TCP urgent data handling (sosendoob) in freedesktop.org libslirp version before v4.9.2 on hypervisor host environments (e.g., QEMU) allows a privileged guest VM attacker (root or CAP_NET_RAW) to leak gigabytes of sensitive host-process heap memory via sending crafted TCP segments with manipulated URG flags and urgent pointers (ti_urp)."}],"affected":[{"vendor":"freedesktop.org","product":"libslirp","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"4.9.2","changes":[{"at":"4.9.2","status":"unaffected"}],"versionType":"semver"}],"repo":"https://gitlab.freedesktop.org/slirp/libslirp/"}],"references":[{"url":"https://gitlab.freedesktop.org/slirp/libslirp/-/work_items/93","tags":["issue-tracking"]},{"url":"https://gitlab.freedesktop.org/slirp/libslirp/-/commit/927bca7344e31fd58e2f7afaca784aad4400eb84","tags":["patch"]},{"url":"https://gitlab.freedesktop.org/slirp/libslirp/-/releases/v4.9.2","tags":["release-notes"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE","baseSeverity":"MEDIUM","baseScore":6.5,"vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","lang":"en","description":"CWE-125 Out-of-bounds read","type":"CWE"}]}],"providerMetadata":{"shortName":"STAR_Labs","orgId":"b1571b85-cbc9-431f-830b-0c8155323a69","dateUpdated":"2026-06-24T04:37:01.955Z"},"datePublic":"2026-06-24T04:25:00.000Z","impacts":[{"capecId":"CAPEC-131","descriptions":[{"lang":"en","value":"CAPEC-131 Resource Leak Exposure"}]}],"credits":[{"lang":"en","value":"Bruce Chen of STAR Labs SG Pte. Ltd.","type":"finder"},{"lang":"en","value":"Shi Weiming of STAR Labs SG Pte. Ltd.","type":"finder"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.2"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://gitlab.freedesktop.org/slirp/libslirp/-/work_items/93","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-24T12:39:41.276722Z","id":"CVE-2026-9539","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-24T12:39:59.831Z"}}]}}}