{"id":"CVE-2026-9539","summary":"libslirp TCP URG OOB Read Information Leak","details":"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).","modified":"2026-10-28T11:21:57.113341611Z","published":"2026-06-24T04:37:01.955Z","related":["SUSE-SU-2026:22452-1","SUSE-SU-2026:22514-1","SUSE-SU-2026:2886-1","SUSE-SU-2026:2931-1","openSUSE-SU-2026:11134-1","openSUSE-SU-2026:21216-1"],"database_specific":{"cna_assigner":"STAR_Labs","cwe_ids":["CWE-125"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9539.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/9xxx/CVE-2026-9539.json"},{"type":"ADVISORY","url":"https://gitlab.freedesktop.org/slirp/libslirp/-/releases/v4.9.2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-9539"},{"type":"REPORT","url":"https://gitlab.freedesktop.org/slirp/libslirp/-/work_items/93"},{"type":"FIX","url":"https://gitlab.freedesktop.org/slirp/libslirp/-/commit/927bca7344e31fd58e2f7afaca784aad4400eb84"},{"type":"PACKAGE","url":"https://gitlab.freedesktop.org/slirp/libslirp/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://gitlab.freedesktop.org/slirp/libslirp","events":[{"introduced":"0"},{"fixed":"97b325339a1377249e68e6c58e9c15a6e1bba4c1"},{"fixed":"927bca7344e31fd58e2f7afaca784aad4400eb84"}],"database_specific":{"extracted_events":[{"source":"AFFECTED_FIELD","strategy":"ChangesAt","range":[{"introduced":"0"},{"fixed":"4.9.2"}]},{"source":"REFERENCES_COMMIT","range":[{"fixed":"927bca7344e31fd58e2f7afaca784aad4400eb84"}]}]}}],"versions":["v4.9.1","v4.9.0","v4.8.0","v4.6.0","v4.3.1","v4.3.0","v4.2.0","v4.1.0","v4.0.0","v4.0.0-rc0","v3.1.0-rc5","v3.1.0-rc4","v3.1.0-rc3","v3.1.0-rc2","v3.1.0-rc1","v3.1.0","v3.1.0-rc0","v3.0.0-rc4","v3.0.0","v3.0.0-rc3","v3.0.0-rc2","v3.0.0-rc1","v3.0.0-rc0","v2.12.1","v2.12.0-rc4","v2.12.0-rc3","v2.12.0-rc2","v2.12.0-rc1","v2.12.0-rc0","v2.12.0","v2.11.2","v2.11.1","v2.11.0-rc5","v2.11.0-rc4","v2.11.0-rc3","v2.11.0-rc2","v2.11.0-rc1","v2.11.0","v2.11.0-rc0","v2.10.0-rc4","v2.10.0-rc3","v2.10.0-rc2","v2.10.0","v2.10.0-rc1","v2.10.0-rc0","v2.9.0-rc5","v2.9.0-rc4","v2.9.0-rc3","v2.9.0","v2.9.0-rc2","v2.9.0-rc1","v2.9.0-rc0","v2.8.1.1","v2.8.1","v2.8.0-rc4","v2.8.0-rc3","v2.8.0-rc2","v2.8.0-rc1","v2.8.0-rc0","v2.8.0","v2.7.0-rc5","v2.7.0-rc4","v2.7.0-rc3","v2.7.0","v2.7.0-rc2","v2.7.0-rc1","v2.7.0-rc0","v2.6.0-rc5","v2.6.0-rc4","v2.6.0","v2.6.0-rc3","v2.6.0-rc2","v2.6.0-rc1","v2.6.0-rc0","v2.5.1.1","v2.5.1","v2.5.0-rc4","v2.5.0-rc3","v2.5.0-rc2","v2.5.0-rc1","v2.5.0-rc0","v2.5.0","v2.4.0.1","v2.4.0-rc4","v2.4.0-rc3","v2.4.0-rc2","v2.4.0-rc1","v2.4.0-rc0","v2.4.0","v2.3.1","v2.3.0-rc4","v2.3.0-rc3","v2.3.0-rc2","v2.3.0-rc1","v2.3.0-rc0","v2.3.0","v2.2.1","v2.2.0-rc5","v2.2.0-rc4","v2.2.0-rc3","v2.2.0-rc2","v2.2.0-rc1","v2.2.0-rc0","v2.2.0","v2.1.1","v2.1.0-rc5","v2.1.0-rc4","v2.1.0-rc3","v2.1.0-rc2","v2.1.0-rc1","v2.1.0-rc0","v2.1.0","v2.0.2","v2.0.1","v2.0.0-rc3","v2.0.0-rc2","v2.0.0-rc1","v2.0.0","v2.0.0-rc0","v1.7.2","v1.7.1","v1.7.0-rc2","v1.7.0-rc1","v1.7.0-rc0","v1.7.0","v1.6.2","v1.6.1","v1.6.0-rc3","v1.6.0-rc2","v1.6.0-rc1","v1.6.0-rc0","v1.6.0","v1.5.3","v1.5.2","v1.5.1","v1.5.0-rc3","v1.5.0-rc2","v1.5.0-rc1","v1.5.0-rc0","v1.5.0","v1.4.0-rc2","v1.4.0-rc1","v1.4.0-rc0","v1.4.0","v1.3.1","v1.3.0-rc2","v1.3.0-rc1","v1.3.0-rc0","v1.3.0","v1.2.0-rc3","v1.2.0-rc2","v1.2.0-rc1","v1.2.0-rc0","v1.2.0","v1.1.2","v1.1.1","v1.1.0-rc4","v1.1.0","v1.1.0-rc3","v1.1.0-rc2","v1.1-rc2","v1.1-rc1","v1.1-rc0","v1.0.1","v1.0-rc4","v1.0-rc3","v1.0-rc2","v1.0-rc1","v1.0-rc0","v1.0","v0.15.1","v0.15.0-rc2","v0.15.0-rc1","v0.15.0","v0.15.0-rc0","v0.14.0-rc1","v0.14.0-rc0","v0.13.0-rc3","v0.13.0-rc2","v0.13.0-rc1","v0.13.0-rc0","v0.13.0","v0.12.1","v0.12.0-rc2","v0.12.0-rc1","v0.12.0-rc0","v0.12.0","v0.11.0-rc0","v0.10.6","v0.10.5","v0.10.4","v0.10.3","v0.10.2","v0.10.1","v0.10.0","release_0_10_2","release_0_10_1","release_0_10_0","v0.9.1","release_0_9_1","v0.9.0","release_0_9_0","v0.8.2","release_0_8_2","v0.8.1","release_0_8_1","v0.7.1","release_0_7_1","v0.7.0","release_0_7_0","v0.6.1","release_0_6_1","v0.6.0","release_0_6_0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-9539.json","vanir_signatures":[{"target":{"file":"src/socket.c"},"deprecated":false,"digest":{"threshold":0.9,"line_hashes":["239007896636702122169078612463953573864","337282997243644609108989416181222452433","178625992849460555765145317077778257029","184557131165001901036770029464061942995","96716069151448504750692702564817460377","166030774534557820525032882621334080242","61848011806209136427149812420009013454","217160008481919143645885049306549777596","308859922090318657823288760968705972357","23030980690315228399985684064480965268","299280594292059674835186776803544821527","35498563452868244884056352465768521512","212409195781232817855624459056561059528","182388760416958016298692469776657523389","282206583731902259232101251941086039962","240657327437796455257550487886416230728","178049144235531965192721677697866889421","238350758681963578877791007657114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